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Balanced Chopper Transistor Switch

IP.com Disclosure Number: IPCOM000076394D
Original Publication Date: 1972-Feb-01
Included in the Prior Art Database: 2005-Feb-24
Document File: 2 page(s) / 28K

Publishing Venue

IBM

Related People

Frushour, JE: AUTHOR

Abstract

This circuit, consisting of an NPN chopper T1 in parallel with a PNP chopper T3, provides low "on" resistance in a transistor chopper switch but does not inject a large base current into the load. Transistors T2 and T4 form constant-current supplies when the input to the base of T2 and T4 are at k6 V and -6 V, respectively. During this time Ib1 and Ib2 are set, equal, resulting in the load current being equal to the source current. Since the drop across the switch is only in the order of several millivolts, a low "on" resistance prevails. When the inputs to the bases of T2 and T4 are at -6 V and +6 V respectively, the switch is off.

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Balanced Chopper Transistor Switch

This circuit, consisting of an NPN chopper T1 in parallel with a PNP chopper T3, provides low "on" resistance in a transistor chopper switch but does not inject a large base current into the load. Transistors T2 and T4 form constant-current supplies when the input to the base of T2 and T4 are at k6 V and -6 V, respectively. During this time Ib1 and Ib2 are set, equal, resulting in the load current being equal to the source current. Since the drop across the switch is only in the order of several millivolts, a low "on" resistance prevails. When the inputs to the bases of T2 and T4 are at -6 V and +6 V respectively, the switch is off.

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