Electrical circuit providing bias voltages

Abstract

Abstract 1374122 Transistor amplifiers RCA CORPORATION 22 Sept 1971 [24 Sept 1970] 44152/71 Heading H3T [Also in Division G3] An electrical circuit suitable for use as a biasing network in an amplifier, comprises first and second semi-conductor devices 110, 112 exhibiting diode conduction characteristics between their first and second electrodes substantially matched or proportionally related to each other, the first and second electrodes of the devices being respectively D.C. coupled to each other, a first and second resistances 114, 116 connecting the first, third electrodes respectively of the devices 110, 112 to supply potentials and a third linear resistance 118 connected across the first and second electrodes of 110. A direct voltage which is a multiple of the base to emitter voltage of the first device 110 and dependent on the ratio of the effective emitter areas of the devices 112, 110 and on the ratio of resistances 114, 118 is obtained at the output terminal 136. The circuit may be used as an amplifier by connecting an input A.C. source 48 to the base of 112 so that an input signal referenced to a fraction of a supply potential is obtained as an amplified signal at 136 referenced to a constant multiple V BE bias voltage. Reference has been directed by the Comptroller to Specification 1,158,416.

Inventors

No inventors recorded.

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