Radio-frequency power amplifier
First Claim
1. A radio-frequency power amplifier comprising:
- a first transistor operable to amplify a power of a radio-frequency signal; and
a bias circuit operable to supply a bias current to the first transistor;
the bias circuit including;
a second transistor that has a collector terminal connected to a first power supply;
a first resistance element that has one end connected to an emitter terminal of the second transistor and has the other end connected to a base terminal of the first transistor;
a second resistance element that has one end connected to the emitter terminal of the second transistor and has the other end connected to ground potential;
at least one third resistance element provided between a base terminal of the second transistor and a second power supply; and
a plurality of temperature compensation circuits connected to the base terminal of the second transistor and operable to control a base potential of the second transistor so that the potential falls as a temperature rises, at least one of the plurality of temperature compensation circuits being unlike all the rest of the plurality of temperature compensation circuits in configuration.
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Accused Products
Abstract
A bias circuit operable to supply a bias current to a first transistor includes: a second transistor having a collector terminal connected to a first power supply; a first resistance element having one end connected to an emitter terminal of the second transistor and having the other end connected to a base terminal of the first transistor; a second resistance element having one end connected to the emitter terminal of the second transistor and having the other end connected to ground potential; at least one third resistance element provided between a base terminal of the second transistor and a second power supply; and a plurality of temperature compensation circuits connected to the base terminal of the second transistor which are operable to control a base potential of the second transistor so that the potential falls as a temperature rises.
61 Citations
7 Claims
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1. A radio-frequency power amplifier comprising:
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a first transistor operable to amplify a power of a radio-frequency signal; and a bias circuit operable to supply a bias current to the first transistor; the bias circuit including; a second transistor that has a collector terminal connected to a first power supply; a first resistance element that has one end connected to an emitter terminal of the second transistor and has the other end connected to a base terminal of the first transistor; a second resistance element that has one end connected to the emitter terminal of the second transistor and has the other end connected to ground potential; at least one third resistance element provided between a base terminal of the second transistor and a second power supply; and a plurality of temperature compensation circuits connected to the base terminal of the second transistor and operable to control a base potential of the second transistor so that the potential falls as a temperature rises, at least one of the plurality of temperature compensation circuits being unlike all the rest of the plurality of temperature compensation circuits in configuration. - View Dependent Claims (2, 3, 4, 5, 6, 7)
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Specification