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Browse Prior Art Database

Gate Circuit

IP.com Disclosure Number: IPCOM000094895D
Original Publication Date: 1965-Jun-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Taub, DM: AUTHOR

Abstract

A gate circuit used for terminating a drive line of a transformer read-only store should have two conflicting characteristics. First, it must present a low impedance to drive current in the line. Secondly, its output impedance must be high enough to dampen oscillatory currents in the line. This circuit provides both of these characteristics by presenting a low impedance to current flowing into it and a higher impedance to current flowing from it.

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Gate Circuit

A gate circuit used for terminating a drive line of a transformer read-only store should have two conflicting characteristics. First, it must present a low impedance to drive current in the line. Secondly, its output impedance must be high enough to dampen oscillatory currents in the line. This circuit provides both of these characteristics by presenting a low impedance to current flowing into it and a higher impedance to current flowing from it.

The drive line is connected to the collector of transistor T3. Input gating pulses are applied to the base of transistor T1. When the circuit is in its quiescent state, T1 and T3 are cut off and T2 and T4 are conducting. An input gating pulse switches T1 to a saturated condition.

This cuts off T4 and T2 and switches T3 to a saturated condition to allow the first half cycle of an oscillatory current in the drive line to flow into T3. In the second half cycle, the drive line current flows from the gate circuit. As T3 then appears almost as an open circuit, this current is taken from the +6V supply terminal, through the base-emitter diode of T4 and resistor R1. This resistor acts to dampen the oscillatory current so that it decays rapidly.

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