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Transient Push Pull Driver

IP.com Disclosure Number: IPCOM000085460D
Original Publication Date: 1976-Apr-01
Included in the Prior Art Database: 2005-Mar-02
Document File: 2 page(s) / 33K

Publishing Venue

IBM

Related People

Klara, WS: AUTHOR [+2]

Abstract

The transient push-pull driver circuit depicted in the drawing allows collector dotting, while still maintaining the advantages inherent in push-pull driver circuits.

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Transient Push Pull Driver

The transient push-pull driver circuit depicted in the drawing allows collector dotting, while still maintaining the advantages inherent in push-pull driver circuits.

The operation of the circuit is as follows: At time t1 the output node D is held up by resistor RL when the input node A is down. During a positive going transition from time t1 to t2, node B drops causing capacitor C to discharge through device T1. Meanwhile device T3 turns "on" causing the output node D to fall. A clamp diode D1 keeps node C from falling too far, thus slowing down the circuit. Transistor T2 remains "off" during this time period.

When the input experiences a negative going transition, from time t3 to t4, devices T1 and T3 turn "off", node B rises causing a transient current spike through capacitor C. Node C responds with a positive going voltage spike thereby, in turn, forcing transistor T2 to conduct with its own current spike. This provides the necessary energy to charge the load capacitance CL to an uplevel in a relatively short time. Device T2 then stops conducting letting resistor RL maintain the uplevel condition.

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