Browse Prior Art Database

Self Biased, Low Voltage, Emitter Followerless Current Switch

IP.com Disclosure Number: IPCOM000079754D
Original Publication Date: 1973-Aug-01
Included in the Prior Art Database: 2005-Feb-26
Document File: 2 page(s) / 32K

Publishing Venue

IBM

Related People

Blumberg, RJ: AUTHOR [+3]

Abstract

The present circuit provides a high-speed and low-power logic family, which is particularly suited for implementation in large-scale integrated circuits. The circuit performs OR/NOR and dot AND functions and only requires one power supply per circuit with a minimum number of components.

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Self Biased, Low Voltage, Emitter Followerless Current Switch

The present circuit provides a high-speed and low-power logic family, which is particularly suited for implementation in large-scale integrated circuits. The circuit performs OR/NOR and dot AND functions and only requires one power supply per circuit with a minimum number of components.

A plurality of input signals are received at the base terminals of a plurality of input switching transistors 10, 12, and 14, or as many as is desired. The reference transistor for the current switch circuit is constituted by transistor 16, and the bias for the reference transistor 16 is automatically generated internal to the circuit by resistors RCO, RA, RB and RCI. A pair of Schottky barrier diodes 20 and 22 complete the internal biasing and regulation circuitry. A single reference supply illustratively shown as -1.5 volts is connected to the common emitter line by resistor RE. An in-phase output signal is generated at output terminal 26 and an out-of-phase signal is generated at output terminal 28.

In Fig. 2, the trade-off between speed and noise tolerance adjustability by the ratio of RA over RB is illustrated by the plot of V(in) versus V(out).

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