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Reduced Emitter Resistance Error in Translinear Circuits

IP.com Disclosure Number: IPCOM000061484D
Original Publication Date: 1986-Aug-01
Included in the Prior Art Database: 2005-Mar-09

Publishing Venue

IBM

Related People

Authors:
Bond, PW Sohn, DT [+details]

Abstract

This article describes a circuit which reduces the emitter resistance error of translinear circuits through the use of different emitter area ratios for the bipolar semiconductor devices used in the core of the circuit. Translinear circuits are an extremely useful classification of circuits that perform algebraic functions on input currents [*]. For example, a translinear principle can be used to provide a square- law function to control the linearity and focus of a CRT electron beam. Simply stated, translinear circuits make use of the logarithmic diode law characteristic of bipolar devices. Simple circuit configurations essentially take the logarithm of various input currents and then take the anti-logarithm of a developed voltage to perform various mathematical functions on the input currents. Fig.