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Modulator Circuit

IP.com Disclosure Number: IPCOM000093892D
Original Publication Date: 1966-Mar-01
Included in the Prior Art Database: 2005-Mar-06
Document File: 2 page(s) / 27K

Publishing Venue

IBM

Related People

Allen, FK: AUTHOR [+2]

Abstract

A transistorized modulator circuit is shown. Transistors 12 and 14 form a complementary transistor pair coupled between a reference potential and supply potential -V. Gating transistor 16 is connected across the transistor pair. When the input to gate terminal 18 is up, i.e., gate is off, transistor 16 is cut off. During this time any signal applied to input terminal 10 appears in the output at terminal 20 by conventional push-pull operation of transistors 12 and 14. When the signal applied to terminal 18 is down, transistor 16 conducts to saturation, thus effectively short-circuiting transistors 12 and 14. The output voltage is then determined by the voltage divider action of the impedances of the collector load resistors and the transistors 12 and 14.

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Modulator Circuit

A transistorized modulator circuit is shown. Transistors 12 and 14 form a complementary transistor pair coupled between a reference potential and supply potential -V. Gating transistor 16 is connected across the transistor pair. When the input to gate terminal 18 is up, i.e., gate is off, transistor 16 is cut off. During this time any signal applied to input terminal 10 appears in the output at terminal 20 by conventional push-pull operation of transistors 12 and 14. When the signal applied to terminal 18 is down, transistor 16 conducts to saturation, thus effectively short-circuiting transistors 12 and 14. The output voltage is then determined by the voltage divider action of the impedances of the collector load resistors and the transistors 12 and 14.

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