On-Chip Active Guard Band Filters to Suppress Substrate- Coupling Noise in Mixed-Signal Integrated Circuits

摘要

An AC coupling configuration for the active guard band filters is introduced for suppressing substrate coupling noise in analog and digital mixed-signal integrated circuits. With this method, a substrate-coupling-noise cancellation signal can be supplied to a ground- level substrate by using a single 3-V supply on-chip circuits. Noise was suppressed to a maximum of less than 0.05from 100Hz to 2 MHz in a 0.35-μm CMOS test chip.