Bias circuit and power amplifier

Details Bias circuit and power amplifier Bias circuit and power amplifier

2007-09-26

2009-08-25

Lee, Benny (Department: 2817)

Amplifiers

With semiconductor amplifying device

Including particular biasing arrangement

Reexamination Certificate

active

07579914

ABSTRACT:
A bias circuit includes: a first transistor having a base terminal grounded via a resistor, and a collector terminal connected to a first power supply port via an adjustment resistor; a second transistor having an emitter terminal connected to the base terminal of the first transistor, and a base terminal connected to the collector terminal of the first transistor; a third transistor having a base terminal connected to the base terminal of the first transistor, and a collector terminal connected to the first power supply port via an adjustment resistor; and a fourth transistor having a base terminal connected to the collector terminal of the third transistor, a current being taken out from the emitter terminal of the fourth transistor. This arrangement makes it possible to suppress a consuming current and output a bias current that is more stable against a temperature change and/or a power supply voltage change.

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