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Browse Prior Art Database

Electronic Switching for Class A Signals

IP.com Disclosure Number: IPCOM000092505D
Original Publication Date: 1966-Nov-01
Included in the Prior Art Database: 2005-Mar-05
Document File: 2 page(s) / 38K

Publishing Venue

IBM

Related People

McDonald, EG: AUTHOR

Abstract

The circuit receives two separate signals at two signal input terminals and produces these signals in an alternating sequence at its single output terminal. The circuit receives inputs at two gate terminals that control the switching from one input signal to the other.

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Electronic Switching for Class A Signals

The circuit receives two separate signals at two signal input terminals and produces these signals in an alternating sequence at its single output terminal. The circuit receives inputs at two gate terminals that control the switching from one input signal to the other.

Transistors T4 and T5 each have their base terminals connected to one of the signal input terminals. T4 and T5 are connected to a common collector load network. Therefore a signal from either T4 or T5 appears at the common connection point of their collector terminals. Transistor T6 is connected to respond to this voltage and to produce an amplified output.

Pairs of transistors T7 - T8 and T9 - T10 are connected to turn on and off the associated transistors T4 and T5 in response to the signals at the gate input terminals. When T8 is turned on, T4 has its emitter terminal connected to a negative potential point through resistors R12 and R13 and the collector-emitter circuit of T8. In this condition, T4 operates as a class A amplifier in response to signals at the associated signal input terminal. When T8 is turned off, T4 has its emitter terminal connected to ground through R12, R13 and R14. In this condition T4 is nonconductive. As the control signals are applied to the gate terminals, T4 and T5 alternate through the operation described for T4. The two input signals appear in an alternating sequence at the output terminal.

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