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Schottky Diode Feedback Current Switch Circuit

IP.com Disclosure Number: IPCOM000078167D
Original Publication Date: 1972-Nov-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Mathews, KF: AUTHOR

Abstract

This circuit provides a current-switch type of operation which is capable of generating an inphase output signal.

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Schottky Diode Feedback Current Switch Circuit

This circuit provides a current-switch type of operation which is capable of generating an inphase output signal.

Operative, with input terminals A and B at approximately +1.0 volt, the transistors T0 and T1 and Schottky-barrier diodes D0 and D1 are in a conductive state. An out-of-phase signal is generated at the collector of transistors T0 and T1 and applied to the base terminal of transistor T2. This voltage level is a Schottky-barrier diode drop below the input level and is at approximately +0.5 volt. The common-emitter node voltage of transistors T0 and T1 is approximately 200 millivolts and, thus, T2 is biased to an OFF state.

With the input terminals A and B at approximately +0.5 volt, transistors T0 and T1 and diodes D0 and D1 are in a nonconductive state. However, T2 and diode D2 are in a conductive state so as to apply approximately +1.0 volt at the base of transistor T2, which also constitutes the out-of-phase output signal A + B. The inphase output is now a Schottky-barrier diode drop below +1.0 volt or approximately +0.5 volt. An appropriate out-of-phase load impedance RC1 is connected to the common-collector terminals of the input switching transistors T0 and T1, and a similar inphase load resistor RC2 is connected to the inphase output line for generating the logic function A + B and A + B, respectively. An appropriate emitter-load resistor RE is connected to the common-emitter terminals of the input s...