A 1.2V 121-Mode CT ΔΣ Modulator for Wireless Receivers in 90nm CMOS

Abstract

A reconfigurable CT 5 <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">th</sup> -order 1b ΔΣ modulator is presented. The DR/BW is programmable from 85dB@100kHz to 52dB@10MHz in 121 steps. Implemented in a 90nm CMOS process, the 0.36mm <sup xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">2</sup> IC includes 2 ΔΣ modulators, a bandgap reference, and a decimator. The power consumption of a single ADC in different modes ranges from 1.44 to 7mW at 1.2V supply