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US 2026/0280492 A1Published application
Power amplifier stability enhancement at extreme conditions
OwnerPhilip John Lehtolainventor
Life of this patent
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Abstract
A power amplifier comprises a first transistor, a first transformer, a first variable resistor, a first bias circuit and coupling circuitry configured to couple the first transformer, a first end of the first variable resistor, and a collector of the first transistor at a first node, the first transformer and a second end of the first variable resistor at a second node, and the bias circuit and a base of the first transistor at a third node.
Claims20
A power amplifier comprising:
- a first transistor;
- a first transformer coupled to a collector of the first transistor;
- a first variable resistor having a first end directly coupled between the first transformer and the first transistor, the first variable resistor being configured to decrease in resistance in response to decreasing temperature at the power amplifier;
- and
- a first bias circuit coupled to a base of the first transistor.
2 more elements
A power amplifier comprising:
- a first transistor;
- a first transformer coupled to a collector of the first transistor;
- a first variable resistor having a first end directly coupled between the first transformer and the first transistor, the first variable resistor being configured to decrease in resistance in response to decreasing temperature at the power amplifier;
- a first bias circuit coupled to a base of the first transistor;
- a temperature sensor configured to sense temperature at the power amplifier;
- and
- a voltage source coupled to the first transistor and configured to adjust voltage levels in response to sensed temperature at the temperature sensor.
4 more elements
A power amplifier comprising:
- a first transistor;
- a first transformer coupled to a collector of the first transistor;
- a first variable resistor having a first end directly coupled between the first transformer and the first transistor, the first variable resistor being configured to decrease in resistance in response to decreasing temperature at the power amplifier;
- a second variable resistor coupled to the first transformer, the second variable resistor being configured to decrease in resistance in response to decreasing temperature at the power amplifier;
- and
- a first bias circuit coupled to a base of the first transistor;
3 more elements
Dependencies are inferred from the claim text.