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Transistor Half Wave Rectifier

IP.com Disclosure Number: IPCOM000098883D
Original Publication Date: 1958-Aug-01
Included in the Prior Art Database: 2005-Mar-08
Document File: 2 page(s) / 30K

Publishing Venue

IBM

Related People

Busch, DF: AUTHOR [+3]

Abstract

The transistor switches permit extremely linear rectification of small input A. C. signals. This is accomplished through the use of transistor pairs alternately forwardly and reversely biased to saturation in synchronism with the incoming A. C. signal, thus providing better rectification than is possible with diodes. The transistors are arranged in pairs so that base to emitter voltage variations in each transistor, caused by load or temperature changes, will be cancelled out by an equal and opposite change in the base to emitter voltage of its twin. Transistor pair 1 is forwardly biased by its transformer each positive half cycle to permit current to flow through the load resistor and reversely biased each negative half cycle to prevent current flow.

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Transistor Half Wave Rectifier

The transistor switches permit extremely linear rectification of small input A.
C. signals. This is accomplished through the use of transistor pairs alternately forwardly and reversely biased to saturation in synchronism with the incoming A.
C. signal, thus providing better rectification than is possible with diodes. The transistors are arranged in pairs so that base to emitter voltage variations in each transistor, caused by load or temperature changes, will be cancelled out by an equal and opposite change in the base to emitter voltage of its twin. Transistor pair 1 is forwardly biased by its transformer each positive half cycle to permit current to flow through the load resistor and reversely biased each negative half cycle to prevent current flow. Transistor pair 2 is forwardly biased each negative half cycle when transistor pair 1 is reversely biased to act as a short circuit to the small back current in the load resistor that occurs because of the finite resistance presented by transistor pair 1 to the negative half-cycle voltage. The rectified voltage may be passed through a multi-stage RC filter or twin T network to produce a low ripple D. C. voltage. The polarity of the output half wave rectified signal is dependent upon whether transistor pair 1 is forwardly biased in synchronism with the positive or negative half cycle of the input A. C. voltage. This circuit is, therefore, a very sensitive low signal level phase shift an...