A Second-Order Noise-Shaping SAR ADC With Passive Integrator and Tri-Level Voting

A 12b-ENOB 61μW Noise-Shaping SAR ADC with a Passive Integrator

This paper presents a novel noise shaping SAR architecture that is simple, robust and low power. It is fully passive and only needs minor modification to a conventional SAR ADC. Through a passive integrator, quantization noise, comparator noise and DAC noise are shaped with a noise transfer function of (1 − 0.75z−1). Unlike conventional multi-bit deltasigma ADCs, both the noise transfer functio...

The Sigma-Delta CNN with Second Order Noise Shaping Property

Abstract: In this paper, a novel spatial domain 2-D sigma-delta modulation using two-layered discrete-time cellular neural networks (DT-CNNs) with multi-stage noise shaping (MASH) property is proposed. Although the sigmadelta modulation is widely used for realizing of analog to digital converter (ADC), sigma-delta concepts are only for 1-D signals. Signal processing in the digital domain is ext...

C18-2 A 13b-ENOB 173dB-FoM 2nd -Order NS SAR ADC with Passive Integrators

Design of an intrinsically-linear double-VCO-based ADC with 2nd-order noise shaping

This paper presents the modeling and design consideration of a time-based ADC architecture that uses VCOs in a high-linearity, 2-order noise-shaping delta-sigma ADC. Instead of driving the VCO by a continuous analog signal, which suffers from the nonlinearity problem of the VCO gain, the VCO is driven in an intrinsically linear way, by a time-domain PWM signal. The two discrete levels of the PW...

A Fourth-Order Bandpass - Modulator Using Second-Order Bandpass Noise-Shaping Dynamic Element Matching

A multibit, bandpass modulator (DSM) using bandpass noise-shaping dynamic element matching (BPNSDEM) is proposed. The modulator was implemented in a 0.25 m CMOS technology. It operates at a 2.5 V power supply and achieves a signal-to-noise ratio (SNR) of 77.4 dB over a 250 kHz bandwidth centered at 566 kHz. The experimental results show the feasibility of a high-speed and high-resolution analog...