Solid-state RF power amplifier for radio transmitters
First Claim
1. An RF power amplifier, comprising:
- a first amplifier module comprising a first push-pull amplifier including a first plurality of field effect transistors and a first output transformer, wherein an output impedance of the first amplifier module is 25 ohms;
a second amplifier module comprising a second push-pull amplifier including a second plurality of field effect transistors and a second output transformer, wherein an output impedance of the second amplifier module is 25 ohms; and
a combiner connected to the first amplifier module and the second amplifier module, wherein the combiner combines an output from the first amplifier module and an output from the second amplifier module into a combined signal, and wherein an output impedance of the combiner is 50 ohms.
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Abstract
An RF power amplifier includes a first amplifier module comprising a first push-pull amplifier including a first plurality of field effect transistors and a first output transformer. An output impedance of the first amplifier module is 25 ohms. A second amplifier module includes a second push-pull amplifier including a second plurality of field effect transistors and a second output transformer. An output impedance of the second amplifier module is 25 ohms. A combiner is connected to the first amplifier module and the second amplifier module. The combiner combines an output from the first amplifier module and an output from the second amplifier module into a combined signal. An output impedance of the combiner is 50 ohms.
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Citations
18 Claims
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1. An RF power amplifier, comprising:
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a first amplifier module comprising a first push-pull amplifier including a first plurality of field effect transistors and a first output transformer, wherein an output impedance of the first amplifier module is 25 ohms; a second amplifier module comprising a second push-pull amplifier including a second plurality of field effect transistors and a second output transformer, wherein an output impedance of the second amplifier module is 25 ohms; and a combiner connected to the first amplifier module and the second amplifier module, wherein the combiner combines an output from the first amplifier module and an output from the second amplifier module into a combined signal, and wherein an output impedance of the combiner is 50 ohms. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12)
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13. An RF power amplifier, comprising:
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a first amplifier module comprising a first push-pull amplifier including a first plurality of transistors and a first output transformer, wherein an output impedance of the first amplifier module is 25 ohms; a second amplifier module comprising a second push-pull amplifier including a second plurality of transistors and a second output transformer, wherein an output impedance of the second amplifier module is 25 ohms; a combiner connected to the first amplifier module and the second amplifier module, wherein the combiner combines an output from the first amplifier module and an output from the second amplifier module into a combined signal, and wherein an output impedance of the combiner is 50 ohms; and temperature compensating bias circuitry for providing a temperature compensated bias voltage to at least one of the first push-pull amplifier and the second push-pull amplifier for decreasing a transistor bias voltage as transistor temperature increases, the temperature compensating bias circuitry comprising; a temperature sensor generating a temperature signal; a first amplifier having an output providing a first temperature dependent voltage based on the temperature signal; and a potentiometer connected to the output of the first amplifier such that a voltage across the potentiometer remains substantially constant when the first temperature dependent voltage changes; and a bias output connected to the at least one of the first push-pull amplifier and the second push-pull amplifier and supplying the temperature compensated bias voltage to the at least one of the first push-pull amplifier and the second push-pull amplifier. - View Dependent Claims (14, 15, 16, 17, 18)
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Specification