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Adaptive Integrated Microsystems Laboratory

"Pushing the Limits of Hybrid Signal Processing"

Our research explores new frontiers in non-conventional signal processing techniques on CMOS and hybrid substrates. These include approaching limits of energy efficiency, sensing and resolution by exploiting computational primitives inherent in the physics of devices, sensors and the underlying noise processes and adaptation.

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Journal Papers

  • P. Sarkar, C. Huang, S. Chakrabartty, ``An Ultra-linear Piezo-Floating-Gate Strain-Gauge for Self-powered Measurement of Quasi-static-strain", IEEE Transactions of Biomedical Circuits and Systems, 2013. (To appear).
  • M. Gu, S. Chakrabartty, ``FAST: A Framework for Simulation and Analysis of Large-scale Protein-Silicon Biosensor Circuits", IEEE Transactions of Biomedical Circuits and Systems, 2013. (To appear).
  • K. Aono, R. Shaga, S. Chakrabartty, ``Exploiting Jump-Resonance Hysteresis in Silicon Auditory Front-ends for Extracting Speaker Discriminative Formant Trajectories", IEEE Transactions of Biomedical Circuits and Systems, 2012. (To appear).
  • M. Gu, S. Chakrabartty, ``Sub-threshold, Varactor-driven CMOS Floating-gate Current Memory Array with less than 150ppm/K Temperature Sensitivity", IEEE Journal of Solid-State Circuits, Nov. 2012. (To appear).
  • C. Huang, S. Chakrabartty, ``An Asynchronous Analog Self-powered Sensor-Data-Logger with a 13.56MHz RF Programming Interface, IEEE Journal of Solid-State Circuits, Feb. 2012. DOI:10.1109/JSSC.2011.2172159. (pdf).
  • A. Fazel, S. Chakrabartty, ``Sparse Auditory Reproducing Kernels (SPARK) Features for Noise-Robust Speech Recognition, IEEE Transactions on Audio, Speech, and Language Processing, vol. 20, no:4, 2012. (pre-print).
  • M. Gu, S. Chakrabartty, ``Synthesis of Bias-Scalable Analog Computing Circuits based on Margin Propagation, IEEE Transactions of Circuits and Systems-I, vol. 69, no:2, 2011. DOI:10.1109/TCSI.2011.2163968. (pre-print).
  • C. Huang, P. Sarkar, S. Chakrabartty, Rail-to-Rail Hot-electron Injection Programming of Floating-gate Voltage Bias Generators at a Resolution of 13 bits, IEEE Journal of Solid-State Circuits, vol.46, no:11, 2011, DOI:10.1109/JSSC.2011.2167390. (pdf).
  • M. Gu, S. Chakrabartty, An Adaptive, 100pJ/bit, (32,8,4), ``Analog LDPC Decoder based on Margin Propagation, IEEE Journal of Solid-State Circuits, vol. 46, no:6, pp.1433-1442, 2011. (pre-print).
  • C. Huang, S. Chakrabartty, A current-input current-output CMOS logarithmic amplifier based on translinear Ohm's law, Electronics Letters, vol. 47, no:7, pp.433-434, 2011. (pdf).
  • C. Huang, S. Chakrabartty, A Compact Self-powered CMOS Strain-rate Monitor for Piezoelectric Energy Scavengers, Electronics Letters, vol. 47, no:4, pp. 277-278, 2011. (pdf).
  • A. Fazel, S. Chakrabartty, Statistical Pattern Recognition Techniques for Speaker Verification, IEEE Circuits and Systems Magazine. vol: 11, no:2, pp. 62-81, 2011. (pdf).
  • Y. Liu, M. Gu, E.C. Alocilja, S. Chakrabartty, Co-detection: Ultra-reliable Nanoparticle-Based Electrical Detection of Biomolecules in the Presence of Large Background Interference, Biosensors and Bioelectronics, Vol. 26, No:3, pp.1087-1092, 2010. (pdf).
  • Y. Liu, E.C. Alocilja, S. Chakrabartty, Biomolecules Detection using a Silver-Enhanced Gold Nanoparticle-Based Biochip, Nano Research Letters, 2010, DOI 10.1007/s11671-010-9542-0. (pdf).
  • A.Fazel, A.Gore, S.Chakrabartty, Resolution Enhancement in sigma-delta Learners for Super-Resolution Source Separation, IEEE Transactions of Signal Processing, vol. 58, no:3, pp. 1193 – 1204, 2010, DOI: 10.1109/TSP.2009.2034909. (pdf).
  • A.Gore, A.Fazel, S. Chakrabartty, Far-field Acoustic Source Localization and Bearing Estimation using Sigma-delta Learners, IEEE Transactions of Circuits and Systems I, vol. 57, no:4, pp. 783-792, 2010, DOI: 10.1109/TCSI.2009.2027627. (pdf).
  • C.Huang, N.Lajnef, S. Chakrabartty, Calibration and Characterization of Self-powered Floating-gate Usage Monitors with Single Electron per Second Operational Limit, IEEE Transactions of Circuits and Systems I, vol. 57, no: 3, pp. 556-567, 2010, DOI: 10.1109/TCSI.2009.2024976. (pdf).
  • A.Gore, S. Chakrabartty, Min-Max Optimization Framework for Designing SigmaDelta Learners: Theory and Hardware, IEEE Transactions of Circuits and Systems I, vol. 57, no: 3, pp. 604-617, 2010, DOI: 10.1109/TCSI.2009.2025002. (pdf).
  • Y.Liu, S.Chakrabartty, Factor Graph based Biomolecular Circuit Analysis for Designing Forward Error Correcting Biosensors, IEEE Transactions of Biomedical Circuits and Systems, vol. 3, no. 3, pp.150-159, June 2009. (pdf).
  • N. Lajnef, N. Elvin, A. Elvin and S. Chakrabartty,  Piezo-Powered Floating Fate Injector for Self-Powered Fatigue Monitoring in Biomechanical Implants,  IEEE Transactions of Biomedical Circuits and Systems, pp.164-172, Vol. 2, Sept. 2008. (pdf).
  • Y. Liu, A. Gore, S. Chakrabartty, and E. C.Alocilja, Characterization of Sub-systems of a Molecular Bio-wire based Biosensor Device,  Microchimica Acta , 2008, DOI: 10.1007/s00604-008-0950-0. (pdf).
  • Y. Liu, S. Chakrabartty, and E. C.Alocilja, Fundamental Building Blocks for Molecular Bio-wire based Forward-error Correcting Biosensors, Nanotechnology, 18, (2007), 4240172. (pdf).
  • S. Chakrabartty, G.Cauwenberghs, A Sub-microwatt Analog VLSI Trainable Pattern Classifier, IEEE Journal of Solid-State Circuits, vol. 42, no: 5, May 2007. (pdf).
  • S. Chakrabartty and G. Cauwenberghs, Gini-Support Vector Machine: Quadratic Entropy Based Multi-class Probability Regression, Journal of Machine Learning Research, Volume 8, pp. 813-839, April 2007. (pdf).
  • V. Venkataramani, S. Chakrabartty , and W. Byrne, Gini-Support Vector Machines for Segmental Minimum Bayes Risk Decoding of Continuous Speech, Computer Speech and Language, Volume 21, Issue 3, July 2007, pp. 423-442. (pdf).
  • S. Chakrabartty, Y. Deng and G. Cauwenberghs, Robust Speech Feature Extraction by Growth Transformation in Reproducing Kernel Hilbert Space, IEEE Transactions on Speech, Language and Acoustics, pp.1842-1849, Vol. 15 Issue: 6, Aug. 2007. (pdf).
  • C. Kong and S.Chakrabartty, Analog Iterative Decoders based on Margin Propagation , IEEE Transactions on Circuits and Systems II, pp. 1140-1144, Vol. 54, no. 12, Dec. 2007. (pdf).
  • A. Gore, S. Chakrabartty, S. Pal, E.C. Alocilja, A Multichannel Femtoampere-Sensitivity Potentiostat Array for Biosensing Applications, IEEE Transactions on Circuits and Systems I: Regular Papers,Volume 53, Issue 11,Nov. 2006 Page(s):2357-2363. (pdf).
  • Y. Zuo; S. Chakrabartty, S. Pal, Z. Tahir,E.C. Alocilja, Spatio-temporal Processing of Multi-channel Biosensors using Support Vector Machines, IEEE Sensors Journal, Volume 6, Issue 6, Page(s): 1644-1651, Dec 2006. (pdf).
  • R. Genov, S. Chakrabartty and G.Cauwenberghs, Silicon Support Vector Machine with On-Line Learning, Int. J. Pattern Recognition and Artificial Intelligence, vol. 17 (3), pp. 385-404, 2003. (pdf).

Book Chapters

  • S.Chakrabartty, N. Lajnef, N.Elvin, A.Elvin, Toward Self-powered Sensors and Circuits for Biomechanical Implants, VLSI Circuits for Biomedical Applications, eds. Krzysztof Iniewski, Artech House, 2008.
  • Y. Liu, E.C. Alocilja, S. Chakrabartty, Integrated Nano-bio-VLSI Approach for Designing Error-free Biosensors, Nano-biosensing, eds. Sandro Carrara, Springer, 2010.

Conference Papers

  • A. Fazel, S. Chakrabartty, Sparse Kernel Cepstral Coefficients (SKCC): Inner-Product Based Features for Noise-Robust Speech Recognition, Proc. of IEEE Symposium of Circuits and Systems (ISCAS 2011), Rio de Janiero, 2011.
  • C. Huang, S. Chakrabartty, A Hybrid Energy Scavenging Sensor for Long-Term Mechanical Strain Monitoring, Proc. of IEEE Symposium of Circuits and Systems (ISCAS 2011), Rio de Janiero, 2011.
  • M. Gu, S. Chakrabartty, An Adaptive Analog Low-Density Parity-Check Decoder Based on Margin Propagation, Proc. of IEEE Symposium of Circuits and Systems (ISCAS 2011), Rio de Janiero, 2011.
  • C. Huang, S. Chakrabartty, Multi-functional self-powered sensor for long-term ambient vibration monitoring, Proc. of SPIE Smart Structures + NDE, San Diego, 2011.
  • C. Huang, S. Chakrabartty, A miniature batteryless health and usage monitoring system based on hybrid energy harvesting, Proc. of SPIE Smart Structures + NDE, San Diego, 2011.
  • C. Huang, S.Chakrabartty, A Temperature Compensated Array of CMOS Floating-Gate Analog Memory, Proc. of IEEE Symposium of Circuits and Systems (ISCAS 2010), Paris, 2010.
  • M.Gu, Y. Liu, S.Chakrabartty, Fast: a Simulation Framework for Solving Large-Scale Probabilistic Inverse Problems in Nano-Biomolecular Circuits, Proc. of IEEE Symposium of Circuits and Systems (ISCAS 2010), Paris, 2010.
  • A. Fazel, S.Chakrabartty, Sigma-Delta Learning for Super-resolution Source Separation on High-density Microphone Arrays, Proc. of IEEE Symposium of Circuits and Systems (ISCAS 2010), Paris, 2010.
  • S.Chakrabartty, S.C. Liu, Exploiting Spike-based Dynamics in a Silicon Cochlea for Speaker Identification, Proc. of IEEE Symposium of Circuits and Systems (ISCAS 2010), Paris, 2010.
  • C. Huang, N. Lajnef, S.Chakrabartty, Infrasonic energy harvesting for embedded structural health monitoring micro-sensors, Proc. of SPIE Smart Structures and Materials + Non-destructive Evaluation and Health Monitoring, San Diego, March 2010.
  • S.Chakrabartty, Multiple-input multiple-output (MIMO) analog-to-feature converter chipsets for sub-wavelength acoustic source localization and bearing estimation, Proc. of SPIE Symposium on Defense, Security and Sensing, Orlando, April 2010.
  • M. Gu, K. Misra, H. Radha, S. Chakrabartty, Sparse Decoding of Low-density Parity Check Codes based on Margin Propagation, Proc. of IEEE Globecomm, Honolulu, HI, 2009.
  • Y. Liu, E. Alocilja, S. Chakrabartty, Exploiting Sub-Threshold and Above-Threshold Characteristics in a Silver-Enhanced Gold Nanoparticle Based Biochip, Proc. of IEEE Conference on Engineering in Medicine and Biology, Minneapolis, 2009.
  • Y. Liu, E. Alocilja, S. Chakrabartty, Co-detection in Forward Error Correcting Biosensors, Nano-DDS Conference, FL, 2009.
  • Y. Liu, E. Alocilja, S. Chakrabartty, Time-based Forward Error Correcting Biosensors, Nano-DDS Conference, FL, 2009.
  • A. Fazel, S. Chakrabartty, Non-Linear Filtering in Reproducing Kernel Hilbert Spaces for Noise-Robust Speaker Verification, Proc. of IEEE International Symposium on Circuits and Systems (ISCAS), Taipei, Taiwan, 2009.
  • Y. Liu, D. Zhang, E. C.Alocilja, and S. Chakrabartty, Design and Characterization of a Silver-Enhanced Gold Nanoparticle-Based Biochip, Proc. of IEEE International Symposium on Circuits and Systems, Taipei, Taiwan, 2009.
  • N. Lajnef, C. Huang and S. Chakrabartty, Infrasonic Power-Harvesting and Nanowatt Self-Powered Sensors, Proc. of IEEE International Symposium on Circuits and Systems, Taipei, Taiwan, 2009.
  • S. Chakrabartty and A.Gore, Sigma-Delta Analog to LPC Feature Converters for Portable Recognition Interfaces, Proc. of IEEE International Symposium on Circuits and Systems, Taipei, Taiwan, 2009.
  • C. Huang and S. Chakrabartty, Reducing Indirect Programming Mismatch Due to Oxide-Traps Using Dual-Channel Floating-Gate Transistors, Proc. of IEEE International Symposium on Circuits and Systems, Taipei, Taiwan, 2009.
  • M. Shi, A.Abbas, S. Chakrabartty and G. Cauwenberghs, An Analog Wavelet Transform CMOS APS Imager Chip, Proc. of IEEE International Symposium on Circuits and Systems, Taipei, Taiwan, 2009.
  • C. Huang and S. Chakrabartty, Low-threshold Voltage Multipliers based on Floating-gate Charge-pumps, IEEE Biomedical Circuits and Systems Conference, Baltimore, USA, 2008.
  • C. Huang and S. Chakrabartty, Self-powered CMOS Impact-rate Monitors for Biomechanical Implants, IEEE Biomedical Circuits and Systems Conference, Baltimore, USA, 2008.
  • Y. Liu, E. C.Alocilja and S. Chakrabartty,  Forward Error Correcting Biosensors: Modeling, Algorithm, and Fabrication, IEEE Biomedical Circuits and Systems Conference, Baltimore, USA, 2008.
  • S. Chakrabartty and Y. Liu, Towards Reliable Multi-pathogen Biosensors using High-dimensional Encoding and Decoding Techniques, SPIE Symposium on NanoScience+Engineering, San Diego, CA, 2008.
  • A. Fazel , S. Chakrabartty, Sigma-Delta Learning for Super-Resolution Independent Component Analysis, IEEE International Symposium on Circuits and Systems (ISCAS), Seattle, WA, 2008.
  • Y. Liu, S. Chakrabartty, E. C.Alocilja, A Multiplexed Biosensor based on Biomolecular Nanowires, IEEE International Symposium on Circuits and Systems , Seattle, USA, 2008.
  • Y. Liu, S. Chakrabartty, Computer Aided Simulation and Verification of Forward Error Correcting Biosensors, IEEE International Symposium on Circuits and Systems , Seattle, USA, 2008.
  • N. Lajnef, S. Chakrabartty and N. Elvin, Calibration and Characterization of Self-powered Floating-gate Sensor Arrays for Long-term Fatigue Monitoring, IEEE Symposium on Circuits and Systems (ISCAS), Seattle WA, May 2008.
  • A. Fazel , S. Chakrabartty, Sigma-Delta Resolution Enhancement for Far-field Acoustic Source Separation, IEEE International Conference on Acoustics, Speech, and Signal Processing (ICASSP), Las Vegas, NV, 2008.
  • Y. Liu, A. Gore, S. Chakrabartty, E. C.Alocilja, A Molecular Bio-wire based Multi-array Biosensor with Integrated potentiostats, IEEE Biomedical Circuits and Systems Conference, pp. 29-32, Montréal, Canada, Nov.2007.
  • Y. Liu, S. Chakrabartty, D. S. Gkinosatis, A. K.Mohanty, and N. Lajnef, Multi-walled Carbon Nanotubes/Poly(L-lactide) Nanocomposite Strain Sensor for Biomechanical Implants, IEEE Biomedical Circuits and Systems Conference, pp. 119-122, Montréal, Canada, Nov.2007.
  • Y. Liu, A. Gore, S. Chakrabartty, E. C.Alocilja, A Molecular Bio-wire based Multi-array Biosensor with Integrated potentiostats, IEEE Biomedical Circuits and Systems Conference, pp. 29-32, Montréal, Canada, Nov.2007. (Invited)
  • Y. Liu , D. S. Gkinosatis, A. K.Mohanty, and S. Chakrabartty, Carbon Nanotube/Polylactide Nanocomposites for Wearable Strain Sensors, Nano and Giga Challenges in Electronics and Photonics, Phoenix, Arizona, March, 2007, U.S.A
  • P. Kucher and S. Chakrabartty , An Energy-Scalable Margin Propagation-Based Analog VLSI Support Vector Machine,  IEEE Symposium on Circuits and Systems (ISCAS'2007), New Orleans 2007.
  • N. Lajnef, S. Chakrbartty, N. Elvin and A. Elvin, Piezo-Powered Floating Fate Injector for Self-Powered Fatigue Monitoring in Biomechanical Implants,  IEEE Symposium on Circuits and Systems (ISCAS'2007), New Orleans 2007.
  • N. Lajnef, S. Chakrbartty, N. Elvin and A. Elvin,A sub-microwatt self-powered fatigue sensor ,  14th International Symposium on: Smart Structures and Materials & Nondestructive Evaluation and Health Monitoring, San Diego, March 2007.
  • A. Gore and S. Chakrbartty , Large Margin Analog-to-digital converters with applications in Neural Prosthetics,  Adv. Neural Information Processing Systems (NIPS'2006).
  • S. Chakrbartty, A.Gore and K.Oweiss, An Adaptive multiple-input multiple-output sigma-delta converter for high-density neuroposthetic electrode arrays, IEEE Conference on Engineering in Medicine and Biology (EMBC 2006), New York.  
  • A.Gore, S.Chakrabartty, S. Pal and E. Alocilja, A Multi-channel Femtoampere Sensitivity Conductometric Array for Biosensing Applications, IEEE Conference on Engineering in Medicine and Biology (EMBC 2006), New York.  
  • N. Lajnef, S.Chakrabartty and N.Elvin, A Sub-microwatt Piezo-floating-gate Sensor for Long-term Fatigue Monitoring in Biomechanical Implants, IEEE Conference on Engineering in Medicine and Biology (EMBC 2006), New York.  
  • C. Kong and S.Chakrabartty, Analog Margin Propagation based Iterative LDPC Decoders, Analog Decoding Workshop, Torino, Italy 2006.
  • S. Chakrabartty, CMOS analog iterative decoders using margin propagation circuits, Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS 2006), 21-24 May 2006
  • P. Kucher and S. Chakrabartty, An Adaptive CMOS Imager with Time-based Compressive Active-pixel Response , Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS 2006), 21-24 May 2006.
  • A. Gore and S. Chakrabartty, Online Calibration of Floating-gate Detectors for RFID Sensors, Midwest Symposium on Circuits and Systems 2005 (Invited Presentation), 7-10 Aug. 2005 Page(s):87 - 90 Vol. 1.
  • S. Chakrabartty and G. Cauwenberghs ,Sub-Microwatt Analog VLSI Support Vector Machine for Pattern Classification and Sequence Estimation, Adv. Neural Information Processing Systems (NIPS'2004), Cambridge: MIT Press, 17, 2005
  • C. Kun, S. Chakrabartty and A. Mason, A Dynamic Reconfigurable A/D Converter for Sensor Applications , IEEE Sensors Conference, 30 Oct.-3 Nov. 2005.
  • S. Chakrabartty and G. Cauwenberghs, Fixed-current Method for Programming Large Floating Gate Arrays , Proceedings of IEEE International Symposium on Circuits and Systems (ISCAS 2005), 23-25 May 2005.
  • R. J. Vogelstein, K. Murari, K.; P.H. Thakur, C. Diehl, S. Chakrabartty, G. Cauwenberghs, Spike sorting with support vector machines, IEEE Conference on Engineering in Medicine and Biology (EMBC 2004),Volume 1,  2004 Page(s):546 - 549 Vol.1.
  • S. Chakrabartty and G. Cauwenberghs, Margin Propagation and Forward Decoding in Analog VLSI, Proc. IEEE Int. Symp. Circuits and Systems (ISCAS'2004), Vancouver Canada, 2004.
  • Y. Deng, S. Chakrabartty and G. Cauwenberghs, A Three Decades Programmable Fully Differential OTA Design, Proc. IEEE Int. Symp. Circuits and Systems (ISCAS'2004), Vancouver Canada, 2004.
  • S. Chakrabartty, Y. Deng and G. Cauwenberghs, Robust Speech Feature Extraction by Growth Transformation in Reproducing Kernel Hilbert Space,  Proc. IEEE Int. Conf. Acoustics Speech and Signal Processing (ICASSP'2004), Montreal Canada, 2004.
  • V. Venkataramani, S. Chakrabartty and W. Byrne, Support Vector Machines for Segmental Minimum Bayes Risk Decoding of Continuous Speech, IEEE Automatic Recognition and Understanding Wokshop (ASRU’03)  St. Thomas, U.S. Virgin Islands, Nov. 30-Dec. 4, 2003.
  • S. Chakrabartty, G. Cauwenberghs and Jayadeva, Sparse Probability Regression by Label Partitioning, Proc. 16th Conf. Computational Learning Theory (COLT'03), Washington DC, Aug. 24-27, 2003.
  • S. Chakrabartty and G. Cauwenberghs, Power Dissipation Limits and Large Margin in Wireless Sensors, Proc. IEEE Int. Symp. Circuits and Systems (ISCAS'2003), Bangkok Thailand, May 25-28, 2003.
  • S. Chakrabartty, M. Yagi, T. Shibata and G. Cauwenberghs, Robust Cephalometric Landmark Identification Using Support Vector Machines, Proc. IEEE Int. Conf. Acoustics Speech and Signal Processing (ICASSP'2003), Hong Kong, Apr. 6-10, 2003.
  • S. Chakrabartty and G. Cauwenberghs, Expectation Maximization of Forward Decoding Kernel Machines, Proc. 9th Int. Workshop Artificial Intelligence and Statistics (AISTATS'2003), Key West FL, Jan. 3-6, 2003.
  • S. Chakrabartty and G. Cauwenberghs, Forward-Decoding Kernel-Based Phone Sequence Recognition, Adv. Neural Information Processing Systems (NIPS'2002), Cambridge: MIT Press, vol. 15, 2003.
  • S. Chakrabartty and G. Cauwenberghs, Forward Decoding Kernel Machines: A Hybrid HMM/SVM Approach to Sequence Recognition,  Proc. SVM'2002, Lecture Notes in Computer Science, vol. 2388, pp. 278-292, 2002.
  • S. Chakrabartty and G. Cauwenberghs, Sequence Estimation and Channel Equalization Using Forward Decoding Kernel Machines, Proc. IEEE Int. Conf. Acoustics Speech and Signal Processing (ICASSP'2002), Orlando FL, May 13-17, 2002.
  • S. Chakrabartty and G. Cauwenberghs, Hybrid Support Vector Machine, Hidden Markov Model Approach for Continuous Speech Recognition, Proc. 43rd IEEE Midwest Symp. Circuits and Systems (MWSCAS'2000), Lansing MI, August 8-11, 2000.
  • S. Chakrabartty, M. Stanacevic and T.D. Tran, Adaptive Image Database Using Wavelets,  Proc. 34th IEEE Asilomar Conference on Signals,Systems and Computers, vol. 2, pp. 1856-1860, Pacific Grove, Oct. 2000.

Questions and comments: shantanu at msu dot edu