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Improved Half Current Switch Circuit

IP.com Disclosure Number: IPCOM000036698D
Original Publication Date: 1989-Oct-01
Included in the Prior Art Database: 2005-Jan-29

Publishing Venue

IBM

Related People

Authors:
Carter, EL Paniccia, AE [+details]

Abstract

In a conventional half-current switch emitter-follower (HCSEF) circuit for low and mid-range cost/performance systems, a low voltage power supply is used to minimize power requirements. Unfortunately, the circuit's power and delay tolerances can be unsatisfactory. Since the ratio of bias resistors Rc/Re is approximately 2, the voltage toler ance across one resistor (Re) is accordingly amplified across the other one (Rc), causing relatively large variations in the circuit's signal swing and noise margins.