A 4.95mW 114dB SNDR delta-sigma modulator based on SC circuits for audio chip

A low-power high-resolution delta-sigma modulator for consumer audio chip is described. The modulator uses a 4th-order CRFF topology based on switched-capacitor (SC) circuits with a 3-bit quantizer and pseudo data-weighted-averaging (PDWA) technique. To reduce power consumption, several techniques including a novel structure OTA, two-step summation, OTA… CONTINUE READING