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Current Supply Independent of Power Supply Voltage Variations

IP.com Disclosure Number: IPCOM000054580D
Original Publication Date: 1980-Mar-01
Included in the Prior Art Database: 2005-Feb-13

Publishing Venue

IBM

Related People

Authors:
Buhler, OR Marino, PT [+details]

Abstract

Using integrated circuits usually entails current switches and emitter followers that operate with a high dependency on current amplitude of the bias supply. For high speed circuits employing integrated circuit techniques, the current amplitude of the bias should be optimized for switching speed and level swing. This can be achieved without designing such circuit to accommodate current level variations for optimizing logic level swings. The bias current should vary inversely with the collector resistor values for making the logic signal swing constant for absolute resistor value variations. A bias circuit which achieves both these ends is shown in above for controlling a set of current sources which, in turn, are coupled to a set of emitter coupled logic circuits.