MOS folded source-coupled logic

US5149992A · kind A · utility

Assignee

• State of Oregon acting by and through the State Board of Higher Ed. on Behalf of Oregon State Univ. · US

Inventors

• David J. Allstot · Seattle, US
• Sayfe Kiasei · Corvallis, US

Key dates

• Filing date: Apr 30, 1991
• Grant date: Sep 22, 1992
• Expiry date: Apr 30, 2011

Classification

• Technology area (CPC H): Electricity
• CPC primary: H10D89/00
• WIPO field: Basic communication processes
• WIPO sector: Electrical engineering

Abstract

In integrated circuitry having both analog and digital circuits fabricated on the same substrate, switching transients produced by the digital circuitry can propagate through the substrate and induce deleterious effects in the associated analog circuitry. Such switching transients are greatly minimized by a CMOS source-coupled current-steering differential logic topology. In the preferred embodiment, gain and level shifting functions are merged, and connections to the power bus are made through constant current sources.