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) and 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) and 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) , 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) , 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, , 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.
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), 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.