This paper proposes a low -power, area -efficient, and high-precision fully passive second-order noise -shaping (NS) successive approximation register (SAR) analog-to-digital converter (ADC) for a portable multi -chan...
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ISBN:
(纸本)9798350354966;9798350354959
This paper proposes a low -power, area -efficient, and high-precision fully passive second-order noise -shaping (NS) successive approximation register (SAR) analog-to-digital converter (ADC) for a portable multi -channel biosignal recorder to detect abnormal action potentials in epilepsy. The proposed fully passive noise-shaping technique achieves a second -order noise transfer function (NTF) using only switched capacitor and a single-input-pair comparator, resulting in significant benefits in power consumption and accuracy. The power consumption is further reduced and the circuit area is minimized by employing a split-segmentedcapacitor digital -to analog converter (CDAC) array. The proposed second -order NS SAR ADC is implemented using a 180nm CMOS process with an area of 0.3x0.28mm(2). Simulation results show that the circuit consumes 86 mu W at a 1.2V supply voltage when the sampling rate is 10MS/s. It achieves a signal-to-noise and distortion ratio (SNDR) of 92.66dB, an effective number of bits (ENOB) of ***, a bandwidth of 80kHz, a Schreier figure of merit (FoM(s)) of 182.3dB, and a Walden figure of merit (FoM(w)) of 15fJ/conv.-step.
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