Gregory K. Chen

Publications (12)0 Total impact

• Conference Proceeding: A dense 45nm half-differential SRAM with lower minimum operating voltage.

  Gregory K. Chen, Michael Wieckowski, Daeyeon Kim, David Blaauw, Dennis Sylvester
  International Symposium on Circuits and Systems (ISCAS 2011), May 15-19 2011, Rio de Janeiro, Brazil; 01/2011
• Conference Proceeding: A 128kb high density portless SRAM using hierarchical bitlines and thyristor sense amplifiers.

  Michael Wieckowski, Gregory K. Chen, Daeyeon Kim, David Blaauw, Dennis Sylvester
  Proceedings of the 12th International Symposium on Quality Electronic Design, ISQED 2011, Santa Clara, California, USA, 14-16 March 2011; 01/2011
• Source

  Available from: Michael Wieckowski

  Conference Proceeding: A cubic-millimeter energy-autonomous wireless intraocular pressure monitor.

  Gregory K. Chen, Hassan Ghaed, Razi-Ul Haque, Michael Wieckowski, Yejoong Kim, Gyouho Kim, David Fick, Daeyeon Kim, Mingoo Seok, Kensall Wise, David Blaauw, Dennis Sylvester
  [show abstract] [hide abstract]
  ABSTRACT: Glaucoma is the leading cause of blindness, affecting 67 million people worldwide. The disease damages the optic nerve due to elevated intraocular pressure (IOP) and can cause complete vision loss if untreated. IOP is commonly assessed using a single tonometric measurement, which provides a limited view since IOP fluctuates with circadian rhythms and physical activity. Continuous measurement can be achieved with an implanted monitor to improve treatment regiments, assess patient compliance to medication schedules, and prevent unnecessary vision loss. The most suitable implantation location is the anterior chamber of the eye, which is surgically accessible and out of the field of vision. The desired IOP monitor (IOPM) volume is limited to 1.5mm³ (0.5x1.5x2mm³) by the size of a self-healing incision, curvature of the cornea, and dilation of the pupil.
  IEEE International Solid-State Circuits Conference, ISSCC 2011, Digest of Technical Papers, San Francisco, CA, USA, 20-24 February, 2011; 01/2011
• Conference Proceeding: Analyzing the impact of Double Patterning Lithography on SRAM variability in 45nm CMOS.

  Vivek Joshi, Michael Wieckowski, Gregory K. Chen, David Blaauw, Dennis Sylvester
  IEEE Custom Integrated Circuits Conference, CICC 2010, San Jose, California, USA, 19-22 September, 2010, Proceedings; 01/2010
• Conference Proceeding: Circuit design advances to enable ubiquitous sensing environments.

  Mingoo Seok, Scott Hanson, Michael Wieckowski, Gregory K. Chen, Yu-Shiang Lin, David Blaauw, Dennis Sylvester
  International Symposium on Circuits and Systems (ISCAS 2010), May 30 - June 2, 2010, Paris, France; 01/2010
• Conference Proceeding: Ultra-low power circuit techniques for a new class of sub-mm

  Yoonmyung Lee, Gregory K. Chen, Scott Hanson, Dennis Sylvester, David Blaauw
  IEEE Custom Integrated Circuits Conference, CICC 2010, San Jose, California, USA, 19-22 September, 2010, Proceedings; 01/2010
• Article: Yield-Driven Near-Threshold SRAM Design.

  Gregory K. Chen, Dennis Sylvester, David Blaauw, Trevor N. Mudge
  IEEE Trans. VLSI Syst. 01/2010; 18:1590-1598.
• Conference Proceeding: Millimeter-scale nearly perpetual sensor system with stacked battery and solar cells.

  Gregory K. Chen, Matthew Fojtik, Daeyeon Kim, David Fick, Junsun Park, Mingoo Seok, Mao-Ter Chen, Zhiyoong Foo, Dennis Sylvester, David Blaauw
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  ABSTRACT: An 8.75 mm³ sensor system is implemented with a near-threshold ARM Cortex-M3 core, custom 3.3 fW leakage-per-bit SRAM, two 1 mm² solar cells, a thin-film Li-ion battery, and an integrated power management unit. The 2.1 ¿W system enters a 100 pW data-retentive sleep state between sensor measurements and harvests energy from the solar cells to enable nearly perpetual operation.
  IEEE International Solid-State Circuits Conference, ISSCC 2010, Digest of Technical Papers, San Francisco, CA, USA, 7-11 February, 2010; 01/2010
• Conference Proceeding: A hybrid DC-DC converter for sub-microwatt sub-1V implantable applications

  Michael Wieckowski, Gregory K. Chen, Mingoo Seok, David Blaauw, Dennis Sylvester
  [show abstract] [hide abstract]
  ABSTRACT: A DC-DC converter for sub-microwatt sub-1V loads is presented for efficient supply regulation of implantable devices powered by thin-film batteries. Using a hybrid, switched-capacitor architecture, it provides 444mV of DC output from a 3.6V DC source. Ultra-low power clock generation, level conversion, and linear regulation, combined with a unique startup circuit, enable a peak efficiency of 56% (4.6X ideal linear regulator) for loads from 5nA to 500nA. Fabricated in 130nm CMOS, it occupies 0.26mm².
  VLSI Circuits, 2009 Symposium on; 07/2009
• Source

  Available from: andrewdeorio.com

  Conference Proceeding: A highly resilient routing algorithm for fault-tolerant NoCs.

  David Fick, Andrew DeOrio, Gregory K. Chen, Valeria Bertacco, Dennis Sylvester, David Blaauw
  Design, Automation and Test in Europe, DATE 2009, Nice, France, April 20-24, 2009; 01/2009
• Source

  Available from: umich.edu

  Conference Proceeding: Reconfigurable energy efficient near threshold cache architectures.

  Ronald G. Dreslinski, Gregory K. Chen, Trevor N. Mudge, David Blaauw, Dennis Sylvester, Krisztián Flautner
  41st Annual IEEE/ACM International Symposium on Microarchitecture (MICRO-41 2008), November 8-12, 2008, Lake Como, Italy; 01/2008
• Conference Proceeding: Yield-driven near-threshold SRAM design.

  Gregory K. Chen, David Blaauw, Trevor N. Mudge, Dennis Sylvester, Nam Sung Kim
  2007 International Conference on Computer-Aided Design (ICCAD'07), November 5-8, 2007, San Jose, CA, USA; 01/2007