Zeljko Ignjatovic

Associate Professor of Electrical and Computer Engineering
Ph.D., University of Rochester, Rochester, NY 2004

Technical Interests:

Analog CMOS IC design, A/D and D/A conversion techniques, image sensors, focal plane compression

Research Labs/Centers:

Transducer Electronics Systems Laboratory (TESLa)
Center for Electronic Imaging Systems

Selected Publications:

Journal Articles

  1. Swetha S. George, Z. Ignjatovic, M. Bocko, "Current Sensing Assisted Active Pixel Sensor for High-Speed CMOS Image Sensors," IEEE Sensor Journal, 2015.

  2. Z. Gao, J.C. Liobe, M. Balon, Z. Ignjatovic, M. Fiscella, M.F. Bocko, "Indirect-feedback Sigma-Delta CMOS image sensors with SAR-based startup,"eStream, 2015.

  3. Zeljko Ignjatovic, Danijel Maricic, Mark F. Bocko,"Low Power, High Dynamic Range CMOS Image Sensor Employing Pixel-Level Oversampling Sigma-Delta Analog-to-Digital Conversion," IEEE Sensors Journal, 2014.

  4. Zhe Gao, John C. Liobe, M.F. Bocko, Zeljko Ignjatovic,"Indirect-Feedback Sigma-Delta Image Sensors: Theory, Modeling and Design," Regular Papers, IEEE Transactions on Circuits and Systems I, 2014.

  5. A. P. Sacco, J. Daniel Newman, Paul P. K. Lee, Kenneth D. Fourspring, John H. Osborn, Robert D. Fiete, Mark F. Bocko, Zeljko Ignjatovic, Judith L. Pipher, Craig W. McMurtry, Xi-Cheng Zhang · Jagannath Dayalu, G. J. Fertig, C. Zhang, Z. Ninkov,"THz imaging Si MOSFET system design at 215 GHz",Proceedings in SPIE, 2014.

  6. Malisa Marijan, Zeljko Ignjatovic,"Non-Linear Reconstruction of Delta-Sigma Modulated Signals: Randomized Surrogate Constraint Decoding Algorithm," IEEE Transactions on Signal Processing, 2013.

  7. Malisa Marijan, Zeljko Ignjatovic,"Information-Theoretic Approach to A/D Conversion," Regular Papers, IEEE Transactions on Circuits and Systems, 2013.

  8. Edwin J. Tan, Zeljko Ignjatovic, Mark F. Bocko, Paul P K Lee,"Non-Uniformly Tiled CMOS Image Sensors for Efficient On-Chip Image Compression," IEEE Sensors Journal, 2012.

  9. Yu Song, Zeljko Ignjatovic,"A High-Performance PLL With a Low-Power Active Switched-Capacitor Loop Filter,"IEEE Transactions on Circuits and Systems II: Express Briefs, 2011

  10. Roland Cheng, Wendi Heinzelman, Melissa Sturge-Apple, Zeljko Ignjatovic,"A Motion-Tracking Ultrasonic Sensor Array for Behavioral Monitoring," IEEE Sensors Journal, 2011.

  11. John Liobe, Mark Fiscella, Eric Moule, Mark Balon, Mark Bocko, Zeljko Ignjatovic,"DS Sentry: An Acquisition ASIC for Smart, Micro-Power Sensing Applications," Proceedings of SPIE, 2011.

  12. Melissa L Sturge-Apple, Michael A Skibo, Fred A Rogosch, Zeljko Ignjatovic, Wendi Heinzelman,"The impact of allostatic load on maternal sympathovagal functioning in stressful child contexts: Implications for problematic parenting,"Development and Psychopathology, 2011

  13. Malisa Marijan, Ilker Demirkol, Danijel Maricić I, Gaurav Sharma, Zeljko Ignjatovic"Adaptive Sensing and Optimal Power Allocation for Wireless Video Sensors With Sigma-Delta Imager," IEEE Transactions on Image Processing, 2010.

  14. Malisa Marijan, Zeljko Ignjatovic, Donald F. Figer, Brian Ashe, Brandon J. Hanold, Thomas Montagliano, Don Stauffer, Shouleh Nikzad"Fully digital image sensor employing delta-sigma indirect feedback ADC with high-sensitivity to low-light illuminations for astronomical imaging applications," Proceedings of SPIE, 2010.

  15. K. E. Kolb, N. C. Stoffel, B. Douglas, C. W. Maloney, A. D. Raisanen, B. Ashe , D. F. Figer, T. Tamagawa, B. Halpern, Zeljko Ignjatovic,"Hybridization of a sigma-delta-based CMOS hybrid detector",Proceedings of SPIE, 2010

  16. Brandon J. Hanold, D. F. Figer, B. Ashe · Thomas Montagliano, Donald J. Stauffer, Zeljko Ignjatovic, Danijel Maricic, Shouleh Nikzad, Todd J. Jones,"Characterization of a SigmaDelta-based CMOS monolithic detector,"Proceedings of SPIE, 2010

  17. Z. Ignjatovic, M. Bocko, "An Interface Circuit for Measuring Capacitance Changes Based Upon Duty Cycle (CDC) Converter," IEEE Sensor Journal, 2005. [PDF]

  18. Z. Ignjatovic, M. Bocko, "A Method for Efficient Interpolation of Uniformly Sampled Discrete-time (Digital) Signals by Using a Blue Noise Mask," in preparation for IEEE Signal Processing Letters. [PDF]

Conference Papers

  1. Swetha S. George, Yu Song, Zeljko Ignjatovic, "A 94-dB SFDR multi-bit audio-band delta-sigma converter with DAC nonlinearity suppression", ISCAS, 2015.

  2. Swetha S. George, Roland Cheng, Zeljko Ignjatovic, "A novel ultrasound imaging technique for portable and high speed imaging", NEWCAS, 2015.

  3. Swetha S. George, Zeljko Ignjatovic, "An improved high speed low noise CMOS image sensor", MWCAS, 2015.

  4. J. B. Dayalu, Z. Ignjatovic, et. al, "Terahertz Detection in Si MOSFET based on Thermionic Emission",Proceedings in SPIE, 2015.
  5. Andrew P. Sacco, et. al,"Transmission imaging measurements at 188 GHz with 0.35µn CMOS technology",Proceedings in SPIE, 2015.
  6. Chao Zhang, et. al,"Optical simulation of terahertz antenna using finite difference time domain method",Proceedings in SPIE, 2015.
  7. Gregory J. Fertig, et. al,"T-ray detection in 0.35-μm CMOS technology",Proceedings in SPIE, 2014.
  8. Guochen Peng, Zeljko Ignjatovic, Mark F Bocko,"Preamplifiers for non-contact capacitive biopotential measurements,"Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2013.

  9. Zhe Gao, John Liobe, Zeljko Ignjatovic, Mark F. Bocko, "Noise model of indirect-feedback sigma-delta image sensors",ISCAS, 2013
  10. Malisa Marijan, Zeljko Ignjatovic," Reconstruction of oversampled signals from the solution space of delta-sigma modulated sequences,"Midwest Symposium on Circuits and Systems, 2011

  11. Yu Song, Zeljko Ignjatovic,"A low-power active switched-capacitor loop filter for phase locked loops", ISCAS, 2010.
  12. Malisa Marijan, Zeljko Ignjatovic,"Code division parallel delta-sigma A/D converter with probabilistic iterative decoding,"ISCAS, 2010.

  13. Yu Song, Zhe Gao, Zeljko Ignjatovic, "A low power linearity-ratio-independent DAC with application in multi-bit ΔΣ ADCs," Midwest Symposium on Circuits and Systems, 2010.

  14. Danijel Maricic, Zeljko Ignjatovic, Mark F. Bocko,"An Oversampling Digital Pixel Sensor with a Charge Transfer DAC Employing Parasitic Capacitances", MWSCAS, 2009.

  15. Yang Zhang, Zeljko Ignjatovic,"Reconfigurable CMOS Image Sensor Design with Built-in Correlated Double Sampling", ISCAS, 2009.

  16. Roland Cheng, Wendi Rabiner Heinzelman, Melissa Sturge-Apple, Zeljko Ignjatovic,"Deployment of a Wireless Ultrasonic Sensor Array for Psychological Monitoring", SENSAPPEAL , 2009.

  17. Malisa Marijan, Wendi Heinzelman, Gaurav Sharma, Zeljko Ignjatovic,"Optimal resource allocation for wireless video sensors with power-rate-distortion model of imager",MWSCAS, 2009.
  18. Zeljko Ignjatovic, Yang Zhang, Mark F. Bocko,"CMOS image sensor readout employing in-pixel transistor current sensing"", ISCAS,2008.

  19. Selçuk Köse, Emre Salman, Zeljko Ignjatovic, Eby G. Friedman,"Pseudo-random clocking to enhance signal integrity",SoCC,2008.

  20. John Liobe, Zeljko Ignjatovic, Mark Bocko,"Ultra-low overhead signal acquisition circuit for capacitive and piezoelectric sensors",MWSCAS, 2008.

  21. Yu Song, Eric C. Moule, Zeljko Ignjatovic,"Adaptable digital delta-sigma modulator for multiband frequency synthesizer", MWSCAS, 2008.
  22. Yu Song, Zeljko Ignjatovic,"Threshold Direct Synthesis Structure for Digital Delta-Sigma Modulators",MWSCAS,2008.

  23. Yuxin Wang, Zeljko Ignjatovic,"On-Chip Substrate Noise Suppression Using Clock Randomization Methodology", MWSCAS,2008.

  24. Eric C. Moule, Zeljko Ignjatovic,"Blue-Noise Sigma-Delta Modulator: Improving Substrate Noise and Nonlinear Amplifier Gain Effects", ISCAS, 2007.

  25. Edwin J. Tan, Zeljko Ignjatovic, Mark F. Bocko,"A CMOS Image Sensor with Focal Plane Discrete Cosine Transform Computation. ISCAS 2007",ISCAS, 2007
  26. Yuxin Wang, Zeljko Ignjatovic,"On-Chip Substrate Noise Suppression Using Clock Randomization Methodology", ISCAS, 2007
  27. Z. Ignjatovic, M. Bocko, "A 0.88 nW/pixel, 99.6 dB Linear-Dynamic-Range Fully-Digital Image Sensor Employing a Pixel-Level Sigma-Delta ADC," VLSI Symposium 2006. [PDF]

  28. E. Moule, Z. Ignjatovic, "A 2-Path Bandpass Sigma-Delta Modulator Utilizing Blue-Noise Path Selection," IEEE International Symposium on Circuits and Systems (ISCAS '06), May 2006. [PDF]

  29. E. Moule, Z. Ignjatovic, "Band-Stop Noise Modulated Bandpass Sigma-Delta Analog-to-Digital Converter," IEEE International Symposium on Circuits and Systems (ISCAS '06), May 2006. [PDF]

  30. Z. Ignjatovic, E. Moule, I. Marcuson, "Blue-Noise Modulated Sigma-Delta Analog-to-Digital Converter," IEEJ International Analog VLSI Workshop (AVLSIWS '05), October 2005. [PDF]

  31. E. Moule, Z. Ignjatovic, "A Time-Interleaved ADC Multiplexed by a Blue- Noise Randomization Method," IEEE International Midwest Symposium on Circuits and Systems (MWSCAS '05), August 2005. [PDF]

  32. M. Perillo, Z. Ignjatovic and W. Heinzelman, "An Energy Conservation Method for Wireless Sensor Networks Employing a Blue Noise Spatial Sampling Technique," Information Processing in Sensor Networks (IPSN '04), April 2004. [PDF]