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Bias circuit for a microwave transistor power amplifier

  • US 4,387,346 A
  • Filed: 12/24/1980
  • Issued: 06/07/1983
  • Est. Priority Date: 08/30/1979
  • Status: Expired due to Fees
First Claim
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1. A microwave transistor power amplifier operated directly from an unregulated variable voltage source whose voltage decreases with operational time, said voltage source having a rated operating value less than the voltage of said transistor, said transistor having a collector-emitter circuit and a base circuit, the emitter of said transistor connected to ground, a low value resistance connecting the collector of said transistor directly to said voltage source,a current regulator connected between said voltage source and said base circuit to supply base current to said transistor,said current regulator including means for sensing decrease in said source voltage, and means responsive to said sensing means for maintaining the current through said regulator to the base of said transistor amplifier essentially constant whereby the average current through said transistor is relatively unaffected by decrease in the value of source voltage throughout the operational time of said voltage source.

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