A Temperature-Stabilized Single-Channel 1-GS/s 60-dB SNDR SAR-Assisted Pipelined ADC With Dynamic Gm-R-Based Amplifier Wenning Jiang, Student Member , IEEE,Y a nZ h u , Member , IEEE

Abstract

A temperature-stabilized 12-bit single-channel successive approximation regi ster (SAR)-assisted pipelined analog-to-digital converter (ADC) running at 1 GS/s with Nyquist signal to noise and distortion ratio (SNDR) above 60 dB is presented. The ADC uses a three-stage (4 b-4 b-6 b) SAR- assisted pipeline hybrid architecture to achieve an attractive energy efficiency along with an extended sampling rate. A high-linearity open-loop Gm-R-based residue amplifier (RA) with both complete-settled an d dynamic features improves the residue amplification efficiency and speed, while reducing the gain variation over a temperature drift. The inter-stage gain variation over the temperature is compensated through complementary temperature coefficients (TCs) from the inner devices of the RA. Furthermore, a cascade amplification topology in the backend RA alleviates the effect of the input parasitic capacitance to its front- end capacitor DAC (CDAC), thus leading to a small CDAC size to accelerate amplification and conversion. The prototype ADC was fabricated in a 28-nm CMOS process and consumes 7.6 mW from a 1-V power supply at 1 GS/s. The measured inter-stage gain variation is less than 2.3% with a temperature range from 0 ◦Ct o8 0 ◦C. The SNDR and SFDR are 60 and 74.6 dB with a Nyquist input, respectively, achieving a Walden figure-of-merit (FoM) of 9.3 fJ/conversion-step and a Schreier FoM of 168.2 dB.