Journals | Integrated Microsystems Laboratory

65

A Study on the Effect of Temperature Variations on FPGA-Based Multi-Channel Time-to-Digital Converters

A.H. Alshehry, S.M. Alshahry, A.K. Alhazmi, and V.P. Chodavarapu, "A Study on the Effect of Temperature Variations on FPGA-Based Multi-Channel Time-to-Digital Converters", Sensors, vol. 23, no. 18, pp. 7672, 2023.

64

Low-Cost, Real-Time Polymerase Chain Reaction System with Integrated RNA Extraction

T. Kadja, Y. Sun, V. P. Chodavarapu, "Low-Cost, Real-Time Polymerase Chain Reaction System with Integrated RNA Extraction", Sensors, vol. 23, no. 4604, 2023.

63

A Size, Weight, Power, and Cost-Efficient 32-Channel Time to Digital Converter Using a Novel Wave Union Method

S. M. Alshahry, A. H. Alshehry, A. K. Alhazmi, V. P. Chodavarapu, "A Size, Weight, Power, and Cost-Efficient 32-Channel Time to Digital Converter Using a Novel Wave Union Method," Sensors,, vol. 23, no. 6621, 2023.

62

Experimental Evaluation of Sensor Fusion of Low-Cost UWB and IMU for Localization under Indoor Dynamic Testing Conditions

C. Liu, T. Kadja, and V. P. Chodavarapu, “Experimental Evaluation of Sensor Fusion of Low-Cost UWB and IMU for Localization under Indoor Dynamic Testing Conditions”, Sensors, vol. 22, iss. 21, no. 8156, 2022.

61

Indium Tin Oxide (ITO) based Ohmic Contacts on Bulk n-GaN Substrate

B. Uppalapati, A. Kota, S. Azad, L. Muthusamy, B. T. Tran, J. H. Leach, H. Splawn, D. Gajula, V. P. Chodavarapu and G. Koley, “Indium Tin Oxide (ITO) based Ohmic Contacts on Bulk n-GaN Substrate”, ECS Journal of Solid State Science and Technology, Volume 11, no. 115008, 2022.

60

Towards a low-cost solution gait analysis using Millimeter Wave Sensor and Machine Learning

M. A. Alanazi, A. K. Alhazmi, O. Alsattam, K. Gnau, M. Brown, S. Theil, K. Jackson, V. P. Chodavarapu, "Towards a low-cost solution gait analysis using Millimeter Wave Sensor and Machine Learning", Sensors, 2022.

59

An AlGaN/GaN Dual Channel Triangular Microcantilever Based UV Detector

B. Uppalapati, D. Gajula, F. Bayram, A. Kota, A. Gunn, D. Khan, V. P. Chodavarapu, and G. Koley, "An AlGaN/GaN Dual Channel Triangular Microcantilever Based UV Detector", ACS Photonics, vol. 9 iss. 6, pp. 1908-1918, 2022.

58

Highly Flexible Stencil Printed Alkaline Ag2O-Zn Battery for Wearable Electronics

A. Kota, L. W. Kum, K. Vallurupalli, A. Gogia, A. T. Neidhard-Doll, and V. P. Chodavarapu, "Highly Flexible Stencil Printed Alkaline Ag2O-Zn Battery for Wearable Electronics", Batteries, vol. 8, iss. 7, 2022.

57

Towards Improved Inertial Navigation by Reducing Errors using Deep Learning Methodology

H. Chen, T. M. Taha, and V. P. Chodavarapu, "Towards Improved Inertial Navigation by Reducing Errors using Deep Learning Methodology", Applied Sciences, vol. 12, iss. 7, 2022.

56

Low-Cost, Real-Time Polymerase Chain Reaction System for Point-of-Care Medical Diagnosis

T. Kadja, C. Liu, Y. Sun, and V. P. Chodavarapu, "Low-Cost, Real-Time Polymerase Chain Reaction System for Point-of-Care Medical Diagnosis", Sensors, vol. 22, iss. 6, no. 2320, 2022.

55

A 6.89-MHz 143-nW MEMS Oscillator Based on a 118-dBΩ Tunable Gain and Duty-Cycle CMOS TIA

A. Kira, M. Y. Elsayed, K. Allidina, V. P. Chodavarapu, and M. N. El-Gamal, "A 6.89-MHz 143-nW MEMS Oscillator Based on a 118-dBΩ Tunable Gain and Duty-Cycle CMOS TIA" Electronics, vol 10, no. 2646, 2021.

54

Experimental Study of Thermal Management Characteristics of Mass Via Arrays

D.A. Smarra and V. P. Chodavarapu, "Experimental Study of Thermal Management Characteristics of Mass Via Arrays", Electronics, vol. 10, iss. 9, 1027, 2021.

53

Cloud-connected real-time oil condition monitoring of utility transformers using impedance spectroscopy

B. Alemayehu, A. Kota, A. Neidhard-Doll, V. Chodavarapu, and G. Subramanyam, “Cloud-Connected Real-Time Oil Condition Monitoring of Utility Transformers using Impedance Spectroscopy,” Instrumentation Science & Technology, March 2021

52

Printed Textile-Based Ag2O–Zn Battery for Body Conformal Wearable Sensors

A. Kota, A, Gogia, A. T. Neidhard-Doll, V. P. Chodavarapu, "Printed Textile-Based Ag2O–Zn Battery for Body Conformal Wearable Sensors", Sensors, vol. 21, iss. 6: 2178, 2021.

51

A Digitally-Programmable CMOS Feedback ASIC for Highly-Stable MEMS-Referenced Oscillators

M. S. Islam, S. K. Singh, G. Xereas, V. P. Chodavarapu, and S. Mandal, "A Digitally-Programmable CMOS Feedback ASIC for Highly-Stable MEMS-Referenced Oscillators", IEEE Transactions on Circuits and Systems-I, vol. 66, iss. 11, pp. 4158 - 4171, 2019

50

Wafer-Level Vacuum-Encapsulated Silicon Resonators with Arc-Welded Electrodes

G. Xereas and V. P. Chodavarapu, “Wafer-Level Vacuum-Encapsulated Silicon Resonators with Arc-Welded Electrodes", IET Micro Nano Letters, vol. 13, iss. 1, pp. 54 –57, 2018

49

Capacitive MEMS Absolute Pressure Sensor using a Modified Commercial Microfabrication Process

A. Merdassi, C. Allan, E. J. Harvey and V. P. Chodavarapu,"Capacitive MEMS Absolute Pressure Sensor using a Modified Commercial Microfabrication Process", Springer Microsystem Technologies, vol. 23, iss. 8, pp. 3215–3225, 2017

48

Wafer-Level Vacuum-Encapsulated Rate Gyroscope with High Quality Factor in a Commercial MEMS Process

A. Merdassi, M. N. Kezzo, and V. P. Chodavarapu, "Wafer-Level Vacuum-Encapsulated Rate Gyroscope with High Quality Factor in a Commercial MEMS Process", Springer Microsystem Technologies, vol. 23, iss. 8, pp. 3745–3756, 2017.

47

Wafer-Level Vacuum Encapsulated Breath-Mode Ring Resonator Fabricated in a Commercial MEMS Process

G. Xereas and V. P. Chodavarapu, "Wafer-Level Vacuum Encapsulated Breath-Mode Ring Resonator Fabricated in a Commercial MEMS Process", IET Electronics Letters, vol. 52, iss. 23, pp. 1941-1942, 2016

46

Wafer-Level Vacuum-Encapsulated Silicon Ring Resonators for Timing and Frequency References

G. Xereas and V. P. Chodavarapu, "Wafer-Level Vacuum-Encapsulated Silicon Ring Resonators for Timing and Frequency References", SPIE Journal of Micro/Nanolithography, MEMS, and MOEMS, vol. 15, iss. 3, 035004, 2016.

45

Wafer Level Vacuum Encapsulated Tri-Axial Accelerometer with Low Cross-Axis Sensitivity in an Unmodified Commercial MEMS Process

A. Merdassi, M. N. Kezzo, G. Xereas and V. P. Chodavarapu, "Wafer Level Vacuum Encapsulated Tri-Axial Accelerometer with Low Cross-Axis Sensitivity in an Unmodified Commercial MEMS Process", Sensors and Actuators: A Physical, vol. 236, pp. 25–37, 2015.

44

Wafer-Level Vacuum-Encapsulated Lame Mode Resonator with f-Q Product of 2.23e13 Hz

G. Xereas and V. P. Chodavarapu, "Wafer-Level Vacuum-Encapsulated Lame Mode Resonator with f-Q Product of 2.23e13 Hz", IEEE Electron Device Letters, vol. 36, iss.10, pp. 1079-1081, 2015.

43

Wide-Temperature Range CMOS Capacitance to Digital Convertor for MEMS Pressure Sensors

Y. Wang and V. P. Chodavarapu, "Wide-Temperature Range CMOS Capacitance to Digital Convertor for MEMS Pressure Sensors", Sensors and Actuators: A Physical, vol. 233, pp. 302–309, 2015.

42

Wafer Level Vacuum Encapsulated Capacitive Accelerometer Fabricated in an Unmodified Commercial MEMS Process

A. Merdassi, P. Yang and V. P. Chodavarapu, "Wafer Level Vacuum Encapsulated Capacitive Accelerometer Fabricated in an Unmodified Commercial MEMS Process", Sensors, vol. 15, iss. 4, pp. 7349-7359, 2015.

40

Creating Diversified Response Profiles from a Single Quenchometric Sensor Element by Using Phase-Resolved Luminescence

E. C. Tehan, R. M. Bukowski, V. P. Chodavarapu, A. H. Titus, A. N. Cartwright, and F. V. Bright, "Creating Diversified Response Profiles from a Single Quenchometric Sensor Element by Using Phase-Resolved Luminescence", Sensors, vol. 15, iss. 1, pp. 760-768, 2015.

41

Differential Wide Temperature Range CMOS Interface Circuit for Capacitive MEMS Pressure Sensors

Y. Wang and V. P. Chodavarapu, "Differential Wide Temperature Range CMOS Interface Circuit for Capacitive MEMS Pressure Sensors", Sensors, vol. 15, iss. 2, pp. 4253-4263, 2015.

39

General-Purpose High-Speed Integrated Lock-In Amplifier with 30dB Dynamic Reserve at 20MHz

A. Hu and V. P. Chodavarapu, "General-Purpose High-Speed Integrated Lock-In Amplifier with 30dB Dynamic Reserve at 20MHz", Analog Integrated Circuits and Signal Processing, vol. 75, pp. 369-382, 2013.

38

Structured Color Humidity Indicator from Reversible Pitch Tuning in Self-Assembled Nanocrystalline Cellulose Films

Y. P. Zhang, V. P. Chodavarapu, A. G. Kirk, M. P. Andrews, "Structured Color Humidity Indicator from Reversible Pitch Tuning in Self-Assembled Nanocrystalline Cellulose Films", Sensors & Actuators: B. Chemical, vol. 176, pp. 692-697, 2013.

37

A Plasmonic Thermocycler for the Amplification of Human Androgen Receptor DNA

P. J. R. Roche, L. K. Beitel, R. Khan, R. Lumbroso, M. Najih, M. C.-K. Cheung, J. Thiemann, V. Veerasubramanian, Mark Trifiro, V. P. Chodavarapu, A. G. Kirk, "A Plasmonic Thermocycler for the Amplification of Human Androgen Receptor DNA", RSC Analyst, vol. 137, pp. 4475-4481, 2012.

36

Nanocrystalline Cellulose for Covert Optical Encryption

Y. P. Zhang, V. P. Chodavarapu, A. G. Kirk, M. P. Andrews, "Nanocrystalline Cellulose for Covert Optical Encryption", SPIE Journal of Nanophotonics, vol. 6, art. 063516, 2012. [SPIE Professional Magazine October 2012: R&D Highlights, Editor's Recommendation - The color of money]

35

Silicon Optoelectronic Microelectrodes with Integrated Oxygen Sensors for Brain Machine Interfaces

M. Hajj-Hassan, V. P. Chodavarapu, S. Musallam, "Silicon Optoelectronic Microelectrodes with Integrated Oxygen Sensors for Brain Machine Interfaces", IET Micro & Nano Letters, vol. 7, pp. 392-396, 2012. [Featured Article of the Issue]

34

A 900MHz Low Power LC-VCO with Reduced Flicker-Noise Up-conversion

A. Hu and V. P. Chodavarapu, "A 900MHz Low Power LC-VCO with Reduced Flicker-Noise Up-conversion", Analog Integrated Circuits and Signal Processing, vol. 71, pp. 197-210, 2012.

33

Porous Nanostructured Encapsulation and Immobilization Materials for Optical Biosensors

M. C. Cheung, K. Y. Yung, H. Xu, N. Kraut, K. Liu, V. P. Chodavarapu, A. N. Cartwright, F. V. Bright, "Porous Nanostructured Encapsulation and Immobilization Materials for Optical Biosensors", IEEE Journal of Selected Topics in Quantum Electronics, vol. 3, pp. 1147 - 1159, 2012. [Invited Article- Special Issue on BioPhotonics]

32

Algal Fluorescence Sensor Integrated into a Microfluidic Chip for Water Pollutant Detection

F. Lefevre, A. Chalifour, L. Yu, V. Chodavarapu, P. Juneau, R. Izquierdo, "Algal Fluorescence Sensor Integrated into a Microfluidic Chip for Water Pollutant Detection", RSC Lab-on-a-Chip, vol. 4, pp. 787-793, 2012.

31

A Camera Phone Localised Surface Plasmon Biosensing Platform Towards Low Cost Label Free Diagnostic Testing

P. J. R. Roche, S. Filion-Cotem, M. C-K. Cheung, V. P. Chodavarapu, A. G. Kirk, "A Camera Phone Localised Surface Plasmon Biosensing Platform Towards Low Cost Label Free Diagnostic Testing", Journal of Sensors, Vol. 2011, Article ID 406425, 2011.

30

Response of Murine Bone Marrow-Derived Mesenchymal Stromal Cells to Dry-Etched Porous Silicon Scaffolds

M. Hajj-Hassan, M. Khayyat-Kholghi, H. Wang, V. P. Chodavarapu, J. E. Henderson, "Response of Murine Bone Marrow-Derived Mesenchymal Stromal Cells to Dry-Etched Porous Silicon Scaffolds", Journal of Biomedical Materials Research: A, vol. 99A, pp. 269-274, 2011.

29

Linearization of Oscillation Frequency for Integrated LC-VCO with Inversion-Mode Varactor

A. Hu and V. P. Chodavarapu, "Linearization of Oscillation Frequency for Integrated LC-VCO with Inversion-Mode Varactor", Analog Integrated Circuits and Signal Processing, vol. 68, pp. 307-314, 2011.

28

Contact CMOS Imaging of Gaseous Oxygen Sensor Array

D. S. Daivasagaya, L. Yao, Ka Yi Yung, M. Hajj-Hassan, M. C. Cheung, V. P. Chodavarapu, and F. V. Bright, "Contact CMOS Imaging of Gaseous Oxygen Sensor Array", Sensors and Actuators: B Chemical, vol.157, pp. 408-416, 2011.

27

CMOS Conductometric System for Growth Monitoring and Sensing of Bacteria

L. Yao, P. Lamarche, N. Tawil, R. Khan, A. M. Aliakbar, M. Hajj-Hassan, V. P. Chodavarapu and R. Mandeville, "CMOS Conductometric System for Growth Monitoring and Sensing of Bacteria", IEEE Transactions on Biomedical Circuits & Systems, vol. 3, pp. 223-230, 2011.

26

Controlling Optical Properties and Surface Morphology of Dry Etch Xenon Difluoride Porous Silicon

M. C. Cheung, P. J. R. Roche, M. Hajj-Hassan, A. G. Kirk, Z. Mi, V. P. Chodavarapu, "Controlling Optical Properties and Surface Morphology of Dry Etch Xenon Difluoride Porous Silicon, SPIE Journal of Nanophotonics, vol.5, iss. 1, art. 053503, 2011.

25

Ultra-Thin Porous Silicon Membranes Fabricated using Dry Etching

M. Hajj-Hassan, M. C. Cheung, V. P. Chodavarapu, "Ultra-Thin Porous Silicon Membranes Fabricated using Dry Etching", IET Micro & Nano Letters, vol 6. iss.4, pp. 226-228, 2011.

24

CMOS Imaging of Temperature Effects of Pin-Printed Xerogel Sensor Microarrays

L. Yao, K. Y. Yung, V. P. Chodavarapu, F. V. Bright, "CMOS Imaging of Temperature Effects of Pin-Printed Xerogel Sensor Microarrays", IEEE Transactions on Biomedical Circuits & Systems, vol. 5, iss. 2, pp. 189-196, 2011.

23

Enhancement of Luminescent Quenching based Oxygen Sensing by Gold Nanoparticles: A Comparison between Luminophore:Matrix:Nanoparticle Thin Films on Glass and Gold Coated Substrates

P. J. R. Roche, M. C. Cheung, L. Yao, A. G. Kirk, V. P. Chodavarapu, "Enhancement of Luminescent Quenching based Oxygen Sensing by Gold Nanoparticles: A Comparison between Luminophore:Matrix:Nanoparticle Thin Films on Glass and Gold Coated Substrates", SPIE Journal of Nanophotonics, vol. 4, art. 043521, 2010.

22

Handheld Impedance Biosensor System using Engineered Proteinaceous Receptors

E. Ghafar-Zadeh, S. F. Chowdhury, A. Aliakbar , R. Lambroso , V. P. Chodavarapu , L. Beitel , M. Sawan , M. Trifiro, "Handheld Impedance Biosensor System using Engineered Proteinaceous Receptors", Biomedical Microdevices, vol. 12, iss. 6, pp. 967-975, 2010.

21

Porous Silicon and Porous Polymer Substrates for Optical Chemical Sensors

M. Hajj-Hassan, S. J. Kim, M. C. Cheung, L. Yao, V. P. Chodavarapu, A. N. Cartwright, "Porous Silicon and Porous Polymer Substrates for Optical Chemical Sensors", SPIE Journal of Nanophotonics, Vol. 4, No. 043513, 2010. (Selected for SPIE Newsroom article in Biomedical Optics & Medical Imaging, 24 September 2010, SPIE Newsroom)

20

CMOS Optoelectronic Lock-in Amplifier with Integrated Phototransistor Array

A. Hu and V. P. Chodavarapu, "CMOS Optoelectronic Lock-in Amplifier with Integrated Phototransistor Array", IEEE Transactions on Biomedical Circuits & Systems, vol. 4, pp. 274-280, 2010.

19

Differential Monitoring of Bacterial Growth using CMOS Capacitive Sensors

E. Ghafar-Zadeh, M. Sawan, V. P. Chodavarapu, T. Hosseini-Nia, "Differential Monitoring of Bacterial Growth using CMOS Capacitive Sensors", IEEE Transactions on Biomedical Circuits & Systems, Vol. 4, pp. 232-238, 2010.

18

Application of Gold Quenching of Luminescence to Improve Oxygen Sensing using a Ruthenium (4,7-diphenyl-1,10-phenanthroline)3 Cl2:TEOS Thin Film

P. J. R. Roche, M. C. Cheung, K. Y. Yung, A. G. Kirk, V. P. Chodavarapu, and F. V. Bright, "Application of Gold Quenching of Luminescence to Improve Oxygen Sensing using a Ruthenium (4,7-diphenyl-1,10-phenanthroline)3 Cl2:TEOS Thin Film", Sensors and Actuators: B Chemical, Vol. 147, pp. 581-586, 2010.

17

CMOS Imaging of Pin-Printed Xerogel based Luminescent Sensor Microarrays

L. Yao, K. Y. Yung, R. Khan, V. P. Chodavarapu, F. V. Bright, "CMOS Imaging of Pin-Printed Xerogel based Luminescent Sensor Microarrays, IEEE Sensors Journal, Vol. 10, pp. 1824-1832, 2010.

16

Dry Etch Fabrication of Porous Silicon using Xenon Difluoride

M. Hajj-Hassan, M. C. Cheung, V. P. Chodavarapu, "Dry Etch Fabrication of Porous Silicon using Xenon Difluoride", IET Micro & Nano Letters, Vol. 5, pp. 63-69, 2010.

15

Sensitivity Enhanced CMOS Phase Luminometry System using Xerogel-based Sensors

L. Yao, R. Khan, V. P. Chodavarapu, V. Tripathi, F. V. Bright, "Sensitivity Enhanced CMOS Phase Luminometry System using Xerogel-based Sensors, IEEE Transactions on Biomedical Circuits & Systems, vol. 3, pp. 304-311, 2009.

14

Reinforced Silicon Neural Microelectrode Array Fabricated using Commercial MEMS Process

M. Hajj-Hassan, V. P. Chodavarapu, S. Musallam, "Reinforced Silicon Neural Microelectrode Array Fabricated using Commercial MEMS Process", SPIE Journal of Micro/Nanolithography, MEMS, and MOEMS, vol. 8, 033011, 2009. (Selected for Virtual Journal of Biological Physics Research, vol. 18, iss. 3, August 2009)

13

Micro-organism-on-Chip: Emerging Direct-Write CMOS-based Platform for Biological Applications

E. Ghafar-Zadeh, M. Sawan, V. P. Chodavarapu, "Micro-organism-on-Chip: Emerging Direct-Write CMOS-based Platform for Biological Applications", IEEE Transactions on Biomedical Circuits & Systems, vol. 3, pp. 212-219, 2009.

12

A Direct-Write Microfluidic Fabrication Process for CMOS-based Lab-on-Chip Applications

E. Ghafar-Zadeh, M. Sawan, D. Therriault, S. Rajagopalan, V. P. Chodavarapu, "A Direct-Write Microfluidic Fabrication Process for CMOS-based Lab-on-Chip Applications", Microelectronic Engineering, vol. 86, pp. 2104-2109, 2009.

11

Microfabrication of Ultra-long Reinforced Silicon Neural Electrodes

M. Hajj-Hassan, V. Chodavarapu, S. Musallam, "Microfabrication of Ultra-long Reinforced Silicon Neural Electrodes", IET Micro & Nano Letters, vol. 4, pp. 53-58, 2009. (Featured Article of the Issue)

10

Direct-Dispense Polymeric Waveguide Platform for Optical Chemical Sensors

M. Hajj-Hassan, T. Gonzalez, E. Ghafer-Zadeh, H. Djeghelian, V. Chodavarapu, M. Andrews, D. Therriault, "Direct-Dispense Polymeric Waveguide Platform for Optical Chemical Sensors", Sensors, vol. 8, pp. 7636-7648, 2008.

9

NeuroMEMS: Neural Probe Microtechnologies

M. Hajj-Hassan, V. Chodavarapu, S. Musallam, "NeuroMEMS: Neural Probe Microtechnologies", Sensors, vol. 8, pp. 6704-6726, 2008.

8

A Polypyrrole-based Strain Sensor Dedicated to Measure Bladder Volume in Patients with Urinary Dysfunction

S. Rajagopalan, M. Sawan, E. Ghafer-Zadeh, O. Savadogo, V. Chodavarapu, "A Polypyrrole-based Strain Sensor Dedicated to Measure Bladder Volume in Patients with Urinary Dysfunction", Sensors, vol. 8, pp. 5081-5095, 2008.

7

Enhanced Oxygen Detection using Porous Polymeric Gratings with Integrated Recognition Elements

S. J. Kim, V. P. Chodavarapu, A. N. Cartwright, M. T. Swihart, and T. J. Bunning, "Enhanced Oxygen Detection using Porous Polymeric Gratings with Integrated Recognition Elements", Sensors and Actuators: B Chemical, vol. 130, pp. 758-764, 2008.

6

CMOS Integrated Luminescence Oxygen Multi-Sensor System

V. P. Chodavarapu, R. M. Bukowski, A. H. Titus, A. N. Cartwright, F. V. Bright, "CMOS Integrated Luminescence Oxygen Multi-Sensor System", Electronics Letters, vol. 43, pp. 688-689, 2007.

5

Phase Fluorometric Glucose Biosensor using Oxygen as Transducer and Enzyme doped Xerogels

R. M. Bukowski, V. P. Chodavarapu, A. H. Titus, A. N. Cartwright, F. V. Bright, "Phase Fluorometric Glucose Biosensor using Oxygen as Transducer and Enzyme doped Xerogels", Electronics Letters, vol. 43, pp. 202-204, 2007.

4

CMOS based Phase Fluorometric Oxygen Sensor System

V. P. Chodavarapu, R. M. Bukowski, D. O. Shubin, A. H. Titus, A. N. Cartwright, F. V. Bright, "CMOS based Phase Fluorometric Oxygen Sensor System", IEEE Transactions on Circuits and Systems-I, vol. 54, pp. 111-118, 2007.

3

Colorimetric Porous Photonic Bandgap Sensors with Integrated CMOS Color Detectors

X. Fang, V. K. Hsiao, V. P. Chodavarapu, A.H. Titus, A. N. Cartwright, "Colorimetric Porous Photonic Bandgap Sensors with Integrated CMOS Color Detectors", IEEE Sensors Journal, vol. 6, pp. 661- 667, 2006.

2

Multi-Sensor System Based on Phase Detection, an LED Array, and Luminophore-Doped Xerogels

V. P. Chodavarapu, R. M. Bukowski, S. J. Kim, A. H. Titus, A. N. Cartwright, F. V. Bright, "Multi-Sensor System Based on Phase Detection, an LED Array, and Luminophore-Doped Xerogels", Electronics Letters, vol. 41, pp. 1031-1033, 2005.

1

Differential Read-Out Architecture for CMOS ISFET Microsystems

V. P. Chodavarapu, A. H. Titus, A. N. Cartwright, "Differential Read-Out Architecture for CMOS ISFET Microsystems", Electronics Letters, vol. 41, pp. 698-699, 2005.

Publications

Journal

A Study on the Effect of Temperature Variations on FPGA-Based Multi-Channel Time-to-Digital Converters

A.H. Alshehry, S.M. Alshahry, A.K. Alhazmi, and V.P. Chodavarapu, "A Study on the Effect of Temperature Variations on FPGA-Based Multi-Channel Time-to-Digital Converters", Sensors, vol. 23, no. 18, pp. 7672, 2023.

Low-Cost, Real-Time Polymerase Chain Reaction System with Integrated RNA Extraction

T. Kadja, Y. Sun, V. P. Chodavarapu, "Low-Cost, Real-Time Polymerase Chain Reaction System with Integrated RNA Extraction", Sensors, vol. 23, no. 4604, 2023.

A Size, Weight, Power, and Cost-Efficient 32-Channel Time to Digital Converter Using a Novel Wave Union Method

S. M. Alshahry, A. H. Alshehry, A. K. Alhazmi, V. P. Chodavarapu, "A Size, Weight, Power, and Cost-Efficient 32-Channel Time to Digital Converter Using a Novel Wave Union Method," Sensors,, vol. 23, no. 6621, 2023.

Experimental Evaluation of Sensor Fusion of Low-Cost UWB and IMU for Localization under Indoor Dynamic Testing Conditions

C. Liu, T. Kadja, and V. P. Chodavarapu, “Experimental Evaluation of Sensor Fusion of Low-Cost UWB and IMU for Localization under Indoor Dynamic Testing Conditions”, Sensors, vol. 22, iss. 21, no. 8156, 2022.

Indium Tin Oxide (ITO) based Ohmic Contacts on Bulk n-GaN Substrate

B. Uppalapati, A. Kota, S. Azad, L. Muthusamy, B. T. Tran, J. H. Leach, H. Splawn, D. Gajula, V. P. Chodavarapu and G. Koley, “Indium Tin Oxide (ITO) based Ohmic Contacts on Bulk n-GaN Substrate”, ECS Journal of Solid State Science and Technology, Volume 11, no. 115008, 2022.

Towards a low-cost solution gait analysis using Millimeter Wave Sensor and Machine Learning

M. A. Alanazi, A. K. Alhazmi, O. Alsattam, K. Gnau, M. Brown, S. Theil, K. Jackson, V. P. Chodavarapu, "Towards a low-cost solution gait analysis using Millimeter Wave Sensor and Machine Learning", Sensors, 2022.

An AlGaN/GaN Dual Channel Triangular Microcantilever Based UV Detector

B. Uppalapati, D. Gajula, F. Bayram, A. Kota, A. Gunn, D. Khan, V. P. Chodavarapu, and G. Koley, "An AlGaN/GaN Dual Channel Triangular Microcantilever Based UV Detector", ACS Photonics, vol. 9 iss. 6, pp. 1908-1918, 2022.

Highly Flexible Stencil Printed Alkaline Ag2O-Zn Battery for Wearable Electronics

A. Kota, L. W. Kum, K. Vallurupalli, A. Gogia, A. T. Neidhard-Doll, and V. P. Chodavarapu, "Highly Flexible Stencil Printed Alkaline Ag2O-Zn Battery for Wearable Electronics", Batteries, vol. 8, iss. 7, 2022.

Towards Improved Inertial Navigation by Reducing Errors using Deep Learning Methodology

H. Chen, T. M. Taha, and V. P. Chodavarapu, "Towards Improved Inertial Navigation by Reducing Errors using Deep Learning Methodology", Applied Sciences, vol. 12, iss. 7, 2022.

Low-Cost, Real-Time Polymerase Chain Reaction System for Point-of-Care Medical Diagnosis

T. Kadja, C. Liu, Y. Sun, and V. P. Chodavarapu, "Low-Cost, Real-Time Polymerase Chain Reaction System for Point-of-Care Medical Diagnosis", Sensors, vol. 22, iss. 6, no. 2320, 2022.

A 6.89-MHz 143-nW MEMS Oscillator Based on a 118-dBΩ Tunable Gain and Duty-Cycle CMOS TIA

A. Kira, M. Y. Elsayed, K. Allidina, V. P. Chodavarapu, and M. N. El-Gamal, "A 6.89-MHz 143-nW MEMS Oscillator Based on a 118-dBΩ Tunable Gain and Duty-Cycle CMOS TIA" Electronics, vol 10, no. 2646, 2021.

Experimental Study of Thermal Management Characteristics of Mass Via Arrays

D.A. Smarra and V. P. Chodavarapu, "Experimental Study of Thermal Management Characteristics of Mass Via Arrays", Electronics, vol. 10, iss. 9, 1027, 2021.

Cloud-connected real-time oil condition monitoring of utility transformers using impedance spectroscopy

B. Alemayehu, A. Kota, A. Neidhard-Doll, V. Chodavarapu, and G. Subramanyam, “Cloud-Connected Real-Time Oil Condition Monitoring of Utility Transformers using Impedance Spectroscopy,” Instrumentation Science & Technology, March 2021

Printed Textile-Based Ag2O–Zn Battery for Body Conformal Wearable Sensors

A. Kota, A, Gogia, A. T. Neidhard-Doll, V. P. Chodavarapu, "Printed Textile-Based Ag2O–Zn Battery for Body Conformal Wearable Sensors", Sensors, vol. 21, iss. 6: 2178, 2021.

A Digitally-Programmable CMOS Feedback ASIC for Highly-Stable MEMS-Referenced Oscillators

M. S. Islam, S. K. Singh, G. Xereas, V. P. Chodavarapu, and S. Mandal, "A Digitally-Programmable CMOS Feedback ASIC for Highly-Stable MEMS-Referenced Oscillators", IEEE Transactions on Circuits and Systems-I, vol. 66, iss. 11, pp. 4158 - 4171, 2019

Wafer-Level Vacuum-Encapsulated Silicon Resonators with Arc-Welded Electrodes

G. Xereas and V. P. Chodavarapu, “Wafer-Level Vacuum-Encapsulated Silicon Resonators with Arc-Welded Electrodes", IET Micro Nano Letters, vol. 13, iss. 1, pp. 54 –57, 2018

Capacitive MEMS Absolute Pressure Sensor using a Modified Commercial Microfabrication Process

A. Merdassi, C. Allan, E. J. Harvey and V. P. Chodavarapu,"Capacitive MEMS Absolute Pressure Sensor using a Modified Commercial Microfabrication Process", Springer Microsystem Technologies, vol. 23, iss. 8, pp. 3215–3225, 2017

Wafer-Level Vacuum-Encapsulated Rate Gyroscope with High Quality Factor in a Commercial MEMS Process

A. Merdassi, M. N. Kezzo, and V. P. Chodavarapu, "Wafer-Level Vacuum-Encapsulated Rate Gyroscope with High Quality Factor in a Commercial MEMS Process", Springer Microsystem Technologies, vol. 23, iss. 8, pp. 3745–3756, 2017.

Wafer-Level Vacuum Encapsulated Breath-Mode Ring Resonator Fabricated in a Commercial MEMS Process

G. Xereas and V. P. Chodavarapu, "Wafer-Level Vacuum Encapsulated Breath-Mode Ring Resonator Fabricated in a Commercial MEMS Process", IET Electronics Letters, vol. 52, iss. 23, pp. 1941-1942, 2016

Wafer-Level Vacuum-Encapsulated Silicon Ring Resonators for Timing and Frequency References

G. Xereas and V. P. Chodavarapu, "Wafer-Level Vacuum-Encapsulated Silicon Ring Resonators for Timing and Frequency References", SPIE Journal of Micro/Nanolithography, MEMS, and MOEMS, vol. 15, iss. 3, 035004, 2016.

Wafer Level Vacuum Encapsulated Tri-Axial Accelerometer with Low Cross-Axis Sensitivity in an Unmodified Commercial MEMS Process

A. Merdassi, M. N. Kezzo, G. Xereas and V. P. Chodavarapu, "Wafer Level Vacuum Encapsulated Tri-Axial Accelerometer with Low Cross-Axis Sensitivity in an Unmodified Commercial MEMS Process", Sensors and Actuators: A Physical, vol. 236, pp. 25–37, 2015.

Wafer-Level Vacuum-Encapsulated Lame Mode Resonator with f-Q Product of 2.23e13 Hz

G. Xereas and V. P. Chodavarapu, "Wafer-Level Vacuum-Encapsulated Lame Mode Resonator with f-Q Product of 2.23e13 Hz", IEEE Electron Device Letters, vol. 36, iss.10, pp. 1079-1081, 2015.

Wide-Temperature Range CMOS Capacitance to Digital Convertor for MEMS Pressure Sensors

Y. Wang and V. P. Chodavarapu, "Wide-Temperature Range CMOS Capacitance to Digital Convertor for MEMS Pressure Sensors", Sensors and Actuators: A Physical, vol. 233, pp. 302–309, 2015.

Wafer Level Vacuum Encapsulated Capacitive Accelerometer Fabricated in an Unmodified Commercial MEMS Process

A. Merdassi, P. Yang and V. P. Chodavarapu, "Wafer Level Vacuum Encapsulated Capacitive Accelerometer Fabricated in an Unmodified Commercial MEMS Process", Sensors, vol. 15, iss. 4, pp. 7349-7359, 2015.

Creating Diversified Response Profiles from a Single Quenchometric Sensor Element by Using Phase-Resolved Luminescence

E. C. Tehan, R. M. Bukowski, V. P. Chodavarapu, A. H. Titus, A. N. Cartwright, and F. V. Bright, "Creating Diversified Response Profiles from a Single Quenchometric Sensor Element by Using Phase-Resolved Luminescence", Sensors, vol. 15, iss. 1, pp. 760-768, 2015.

Differential Wide Temperature Range CMOS Interface Circuit for Capacitive MEMS Pressure Sensors

Y. Wang and V. P. Chodavarapu, "Differential Wide Temperature Range CMOS Interface Circuit for Capacitive MEMS Pressure Sensors", Sensors, vol. 15, iss. 2, pp. 4253-4263, 2015.

General-Purpose High-Speed Integrated Lock-In Amplifier with 30dB Dynamic Reserve at 20MHz

A. Hu and V. P. Chodavarapu, "General-Purpose High-Speed Integrated Lock-In Amplifier with 30dB Dynamic Reserve at 20MHz", Analog Integrated Circuits and Signal Processing, vol. 75, pp. 369-382, 2013.

Structured Color Humidity Indicator from Reversible Pitch Tuning in Self-Assembled Nanocrystalline Cellulose Films

Y. P. Zhang, V. P. Chodavarapu, A. G. Kirk, M. P. Andrews, "Structured Color Humidity Indicator from Reversible Pitch Tuning in Self-Assembled Nanocrystalline Cellulose Films", Sensors & Actuators: B. Chemical, vol. 176, pp. 692-697, 2013.

A Plasmonic Thermocycler for the Amplification of Human Androgen Receptor DNA

P. J. R. Roche, L. K. Beitel, R. Khan, R. Lumbroso, M. Najih, M. C.-K. Cheung, J. Thiemann, V. Veerasubramanian, Mark Trifiro, V. P. Chodavarapu, A. G. Kirk, "A Plasmonic Thermocycler for the Amplification of Human Androgen Receptor DNA", RSC Analyst, vol. 137, pp. 4475-4481, 2012.

Nanocrystalline Cellulose for Covert Optical Encryption

Y. P. Zhang, V. P. Chodavarapu, A. G. Kirk, M. P. Andrews, "Nanocrystalline Cellulose for Covert Optical Encryption", SPIE Journal of Nanophotonics, vol. 6, art. 063516, 2012. [SPIE Professional Magazine October 2012: R&D Highlights, Editor's Recommendation - The color of money]

Silicon Optoelectronic Microelectrodes with Integrated Oxygen Sensors for Brain Machine Interfaces

M. Hajj-Hassan, V. P. Chodavarapu, S. Musallam, "Silicon Optoelectronic Microelectrodes with Integrated Oxygen Sensors for Brain Machine Interfaces", IET Micro & Nano Letters, vol. 7, pp. 392-396, 2012. [Featured Article of the Issue]

A 900MHz Low Power LC-VCO with Reduced Flicker-Noise Up-conversion

A. Hu and V. P. Chodavarapu, "A 900MHz Low Power LC-VCO with Reduced Flicker-Noise Up-conversion", Analog Integrated Circuits and Signal Processing, vol. 71, pp. 197-210, 2012.

Porous Nanostructured Encapsulation and Immobilization Materials for Optical Biosensors

Algal Fluorescence Sensor Integrated into a Microfluidic Chip for Water Pollutant Detection

F. Lefevre, A. Chalifour, L. Yu, V. Chodavarapu, P. Juneau, R. Izquierdo, "Algal Fluorescence Sensor Integrated into a Microfluidic Chip for Water Pollutant Detection", RSC Lab-on-a-Chip, vol. 4, pp. 787-793, 2012.

A Camera Phone Localised Surface Plasmon Biosensing Platform Towards Low Cost Label Free Diagnostic Testing

P. J. R. Roche, S. Filion-Cotem, M. C-K. Cheung, V. P. Chodavarapu, A. G. Kirk, "A Camera Phone Localised Surface Plasmon Biosensing Platform Towards Low Cost Label Free Diagnostic Testing", Journal of Sensors, Vol. 2011, Article ID 406425, 2011.

Response of Murine Bone Marrow-Derived Mesenchymal Stromal Cells to Dry-Etched Porous Silicon Scaffolds

M. Hajj-Hassan, M. Khayyat-Kholghi, H. Wang, V. P. Chodavarapu, J. E. Henderson, "Response of Murine Bone Marrow-Derived Mesenchymal Stromal Cells to Dry-Etched Porous Silicon Scaffolds", Journal of Biomedical Materials Research: A, vol. 99A, pp. 269-274, 2011.

Linearization of Oscillation Frequency for Integrated LC-VCO with Inversion-Mode Varactor

A. Hu and V. P. Chodavarapu, "Linearization of Oscillation Frequency for Integrated LC-VCO with Inversion-Mode Varactor", Analog Integrated Circuits and Signal Processing, vol. 68, pp. 307-314, 2011.

Contact CMOS Imaging of Gaseous Oxygen Sensor Array

D. S. Daivasagaya, L. Yao, Ka Yi Yung, M. Hajj-Hassan, M. C. Cheung, V. P. Chodavarapu, and F. V. Bright, "Contact CMOS Imaging of Gaseous Oxygen Sensor Array", Sensors and Actuators: B Chemical, vol.157, pp. 408-416, 2011.

CMOS Conductometric System for Growth Monitoring and Sensing of Bacteria

L. Yao, P. Lamarche, N. Tawil, R. Khan, A. M. Aliakbar, M. Hajj-Hassan, V. P. Chodavarapu and R. Mandeville, "CMOS Conductometric System for Growth Monitoring and Sensing of Bacteria", IEEE Transactions on Biomedical Circuits & Systems, vol. 3, pp. 223-230, 2011.

Controlling Optical Properties and Surface Morphology of Dry Etch Xenon Difluoride Porous Silicon