First-order Continuous-time Sigma-delta Modulator

Yamei Li and Lili He
San Jose State University


This paper presents the design of a first-order continuous-time sigma-delta modulator. It can accept input signal bandwidth of 10 kHz with over sampling ratio of 250. The modulator operates at 1.8 V supply voltage and uses 0.18micron CMOS technology. It achieves a level of 60 dB SNR.