Analog Circuits Group


Voltage1)/Current2) Reference: Generates stable DC voltage/Current against temperature and supply variations over a wide temperature range and low power consumption

  • VDD: 0.7 to 1.8 V
  • Power: 210 nW @ 0.7 V
  • Temp. range: -50 to 130 ˚C
  • Temp. coefficient: 29.3 ppm/˚C
  • Line sensitivity: 337 ppm/V

  • VDD: 1 V
  • Power: 1.4 μW
  • Temp. range: 0 to 100 ˚C
  • Temp. coefficient: 24.9 ppm/˚C
  • Line sensitivity: 0.13 %/V

1) J. Leeand S.H. Cho, " A 210 nW 29.3 ppm/˚C 0.7 V Voltage Reference with a Temperature Range of -50 to 130 ˚C in 0.13 μm CMOS," IEEE Symposium on VLSI Circuits, 2011.

2) J. Leeand S.H. Cho, " A 1.4 μW 24.9 ppm/˚C Current Reference with Process Insensitive Temperature Compensation in 0.18 m CMOS," IEEE J. Solid-State Circuits, 2012.

On-Chip Oscillator1),2) : Integrated circuit on a chip that produces a periodic, oscillating signal, often a sine wave or a square wave

  • Chip area : 0.086μm2
  • 53μW from 1.4V supply at 4.7MHz output
  • No decoupling capacitors
  • No supply regulator
  • 0.04% RMS period jitter
  • -22dB worst-case PSNR

  • Chip area : 0.015μm2
  • 219.8μW from 1.4V supply at 10.5MHz, and 49.72% duty cycle
  • 9.86psrms(0.01%) period jitter
  • FOM :157.7 @ 1kHz
    162.1 @ 100kHz

1) J. Lee, P. Park, S. Cho and M. Je, “A 4.7MHz 53μW Fully Differential CMOS Reference Clock Oscillator with –22dB Worst-Case PSNR for Miniaturized SoCs,”, ISSCC, 2015.

2) J. Lee, A. George and M. Je, “A 1.4V 10.5MHz Swing-Boosted Differential Relaxation Oscillator with 162.1dBc/Hz FOM and 9.86psrms Period Jitter in 0.18μm CMOS", ISSCC, 2016.

Bio-medical Sensors Group


Supply & Temperature Insensitive Capacitive Sensor1)

  • VDD:0.8 to 1.2 V & Power: 18.4 μW
  • Capacitance resolution: 2.05 fF
  • Temp. range: -40 to 120 ˚C, Temp. coefficient: 153.4 ppm/ ˚C
  • Supply sensitivity: 1.12% @ 0.8 to 1.2 V
  • 1.12% @ 0.8 to 1.2 V: 0.102 mm2

16-Channel Neural Signal Acquisition: In Vivo Test

Neural Rec. & Stim. System

1) A. George, J. Lee, Z.H. Kong, and M. Je, “A 0.8-V Supply- and Temperature- Insensitive Capacitance-to-Digital Converter in 0.18-μm CMOS,” IEEE Sensors Journal, under review after submission.

Wireless Comm. Group


BCC System1) : Uses a human body as a communication channel instead of the conventional air medium.

  • Significant reduction of power consumption
  • No bulky antenna
  • No fading effect

  • Maximum data rate : 60 Mbps
  • Sensitivity :-58 dBm @ < 10-5 BER
  • SIR : -20 dB @ 10-3 BER
  • Power : 1.85 mW in TX, 9.02 mW in RX
  • Energy/bit : 31 pJ/b for TX, 150 pJ/b for RX

1)J. Lee, V. V. Kulkarni, Chee Keong Ho, and M. Je, “A 60Mb/s wideband BCC transceiver with 150pJ/b RX and 31pJ/b TX for emerging wearable applications,”, ISSCC, 2014.

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