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Browse Prior Art Database

High Speed Power Driver Circuit

IP.com Disclosure Number: IPCOM000097517D
Original Publication Date: 1961-Jan-01
Included in the Prior Art Database: 2005-Mar-07
Document File: 2 page(s) / 29K

Publishing Venue

IBM

Related People

Gruodis, AJ: AUTHOR

Abstract

This transistor circuit provides an output current which follows the input signal rapidly. The circuit has a low power dissipation.

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High Speed Power Driver Circuit

This transistor circuit provides an output current which follows the input signal rapidly. The circuit has a low power dissipation.

The operation resembles that of an emitter follower. Application of a positive pulse on the input terminal 1 causes transistor T1 to conduct, causing the voltage on output terminal 2 to approach the voltage of the positive supply on terminal 3. The voltage at node A drops because of the current flow through the impedance
Z. Impedance Z may be a combination of resistance and inductance according to the current requirements of the load to be driven at the output terminal 2. The capacitor C is charged up rapidly through the low impedance of diode D,

When a negative pulse is applied to input 1, Tl stops conducting and the voltage at A returns to the potential at 3. This rise in potential at A is transmitted to node B through C, causing transistor T2 to conduct. When T2 conducts, the voltage level on output 2 is caused to rapidly approach the negative potential of the voltage supply on terminal 4. This transition on 2 from the positive level to the negative level is usually slow in the normal emitter follower circuit driving a capacitive load. In this circuit, however, due to the action of T2, the voltage on 2 is rapidly pulled down to the lower level on 4 when the input signal is reduced..

Resistor R1 removes the voltage drop from emitter to base of T2 when it is not active, so that this transistor is not...