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Pulse Powered High Order Decode Circuit

IP.com Disclosure Number: IPCOM000078254D
Original Publication Date: 1972-Dec-01
Included in the Prior Art Database: 2005-Feb-25
Document File: 2 page(s) / 31K

Publishing Venue

IBM

Related People

Cassidy, BM: AUTHOR [+3]

Abstract

A pulse power decode circuit having a gating circuit coupled onto its output lines and powered by the same source as powers up the decode circuit, can result in significant power savings. Broadly, the gating circuit receives an input from a true-complement (T/C) generator, to assure that the decoder output line is held at a low voltage for sufficient time to assure that a signal can be received at the decoder input.

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Pulse Powered High Order Decode Circuit

A pulse power decode circuit having a gating circuit coupled onto its output lines and powered by the same source as powers up the decode circuit, can result in significant power savings. Broadly, the gating circuit receives an input from a true-complement (T/C) generator, to assure that the decoder output line is held at a low voltage for sufficient time to assure that a signal can be received at the decoder input.

At the beginning of the cycle the B+ voltage is applied to the collector of T1 and to the cathode of diode D1. However, the base of transistor T1 remains at a low value, because the transistor T4 whose collector and base is coupled to the anode of D1 through resistors R1 and R2, respectively, is on, drawing current from the base of T1 thru diodes D2 and D3. A true-complement generator, not shown, supplies signals (WO, WO, and W1) to the base of transistors T3 and T5. All outputs of the T/C generators are at -3.0V in standby. These signals turn off the gating circuit, consisting of transistors T4 and T5, by applying a signal to the base of T5 which turns on T5 and turns off transistor T4.

When T4 turns off the base of transistor Tl is permitted to rise towards B+. If the input signals from the T/C generator do not select this decode circuit, transistor T3 turns on as the gating circuit is being turned off. This causes the base of transistor T1 to be pulled towards -3V and T1 remains off. Thus the gating circuit i...