Abstract
Conference Title: 2015 IEEE 28th Canadian Conference on Electrical and Computer Engineering (CCECE) Conference Start Date: 2015, May 3 Conference End Date: 2015, May 6 Conference Location: Halifax, NS, Canada The conventional current-steering Opamp is the building block of sigma-delta modulator circuits. It is also the major power consuming part of the circuit. The chargesteering concept can be applied to Opamps to obtain minimum power consumption. The two-stage charge-steering Opamp has been designed using 0.18um TSMC CMOS technology that consumes 0.23 mW power at a 48 MHz sampling frequency. A 2nd order, 1-bit, SC sigma-delta modulator is used to prove the applicability of the charge steering concept in sigma-delta modulators. The system achieves a SNR of 46 dB and a DR of 60 dB over a 1 MHz BW. The total power consumption of the circuit is 1.3 mW at 1.2v power supply.