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Advanced‐performance haptic systems, with high dynamic range (DR) and high pressure sensitivity, that accurately sense the small force variations with a wide detection range are essential for robotic systems, human‐machine interactions, and medical monitoring devices. However, existing skin‐like devices, such as capacitive or electrical transistor detectors, are limited by pressure contrast or recognition...
This paper presents a strong silicon physically unclonable function (PUF) immune to machine learning (ML) attacks. The PUF, termed the subthreshold current array (SCA) PUF, is composed of a pair of two-dimensional transistor arrays and a low-offset comparator. The fabricated PUF chip allows 265 challenge-response pairs (CRPs) and achieves high reliability with average bit error rate (BER) of 5.8%...
This paper presents a highly power efficient amplifier. By stacking inverters and splitting the capacitor feedback network, the proposed amplifier achieves 6-time current reuse, thereby significantly boosting gm and lowering noise but without increasing power. A novel biasing scheme is devised to ensure robust operation under 1V supply. A prototype in 180nm CMOS has 5.5uV rms noise within 10kHz BW...
Conventional analog/mixed-signal (AMS) circuits design methodology relying heavily on the use of operational amplifiers (opamps) to process signals in voltage-domain (VD) encounters severe difficulties in advanced nanometer-scale CMOS process. We present a novel scaling compatible, synthesis friendly ring voltage-controlled oscillator (VCO) based time-domain (TD) delta-sigma analog-to-digital converter...
The effects of comparator input common-mode voltage Vcm are analyzed in this paper. The analysis clearly shows a trade-off in the choice of Vcm in terms of offset, noise, power and speed. Based on the analysis, an energy efficient SAR ADC switching technique is proposed with less Vcm variation and better linearity compared with the widely used monotonic switching technique. Both the simulation results...
Analog signal-processing in deep sub-micron technologies poses many challenges arising from both low supply voltage and intrinsic voltage-gain of short channel devices. Class-AB CMOS transconductance obtained by a pair of complementary transistors is a widely used power efficient building block because it has linear v - i characteristics. This is topologically the same as the logic inverter of CMOS...
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