APPARATUS AND METHOD FOR REDUCING NOISE IN MIXED-SIGNAL CIRCUITS AND DIGITAL CIRCUITS

摘要

Apparatus and a method are provided for reducing noise in mixed-signal and digital circuits. One apparatus ( 200 ) includes a metal-oxide-semiconductor field-effect transistor (MOSFET) ( 210 ). MOSFET ( 210 ) includes a doped substrate ( 2210 ) with a source formed proximate a substrate tie ( 2224 ) and a substrate tie ( 2250 ) adjacent substrate ( 2210 ). A ground rail ( 255 ) is coupled to the source and substrate tie ( 2224 ), and a ground rail ( 285 ) is coupled to substrate tie ( 2250 ). Ground rails ( 255 ) and ( 285 ) are configured to be coupled to different ground networks ( 250 and 280 ). One method includes producing a model of a semiconductor device including a standard semiconductor cell ( 710 ). The semiconductor cell is identified as a noise-sensitive or a noise-producing semiconductor cell ( 720 ), and the semiconductor cell is replaced with a corresponding noise-aware semiconductor cell ( 730 ).