Power control loop using a tunable antenna matching circuit
First Claim
1. A method comprising:
- providing a first radio frequency (RF) terminal comprising an RF receiver, an RF power amplifier, and a tunable antenna matching circuit, such that the tunable antenna matching circuit is coupled between an output of the RF power amplifier and an antenna;
receiving at least a first command from a second RF terminal using the RF receiver, such that the at least the first command instructs the first RF terminal to adjust an output power from the first RF terminal;
adjusting an impedance of the tunable antenna matching circuit and adjusting at least one input signal to the RF power amplifier in response to the at least the first command;
detecting a phase shift of an RF transmit signal from the first RF terminal resulting from adjusting impedance of the tunable antenna matching circuit; and
applying a compensating phase shift to an input signal to the RF power amplifier based on the detected phase shift,wherein the output power is based on the impedance of the tunable antenna matching circuit and the at least one input signal to the RF power amplifier.
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Accused Products
Abstract
The present disclosure relates to combining tunable antenna matching circuit adjustments and RF power amplifier output power adjustments of a first RF terminal in response to output power adjustment commands received from a second RF terminal. The output power adjustment commands may be part of an output power control loop between the first RF terminal and the second RF terminal to control the output power from the first RF terminal. The first RF terminal may include an RF receiver, an RF power amplifier, and a tunable antenna matching circuit coupled between an output of the RF power amplifier and an antenna. The tunable antenna matching circuit adjustments may be impedance adjustments of the tunable antenna matching circuit and the RF power amplifier output power adjustments may result from adjustments to one or more input signals to the RF power amplifier.
142 Citations
22 Claims
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1. A method comprising:
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providing a first radio frequency (RF) terminal comprising an RF receiver, an RF power amplifier, and a tunable antenna matching circuit, such that the tunable antenna matching circuit is coupled between an output of the RF power amplifier and an antenna; receiving at least a first command from a second RF terminal using the RF receiver, such that the at least the first command instructs the first RF terminal to adjust an output power from the first RF terminal; adjusting an impedance of the tunable antenna matching circuit and adjusting at least one input signal to the RF power amplifier in response to the at least the first command; detecting a phase shift of an RF transmit signal from the first RF terminal resulting from adjusting impedance of the tunable antenna matching circuit; and applying a compensating phase shift to an input signal to the RF power amplifier based on the detected phase shift, wherein the output power is based on the impedance of the tunable antenna matching circuit and the at least one input signal to the RF power amplifier. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14, 15, 16, 17, 18, 19, 20, 21)
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22. A first radio frequency (RF) terminal comprising:
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an RF receiver adapted to receive at least a first command from a second RF terminal, such that the at least the first command instructs the first RF terminal to adjust an output power from the first RF terminal; an RF power amplifier adapted to receive at least one input signal; an antenna; a tunable antenna matching circuit coupled between an output of the RF power amplifier and the antenna; and control circuitry adapted to; adjust an impedance of the tunable antenna matching circuit and adjust the at least one input signal to the RF power amplifier in response to the at least the first command; detect a phase shift of an RF transmit signal from the first RF terminal resulting from adjusting impedance of the tunable antenna matching circuit; and apply a compensating phase shift to an input signal to the RF power amplifier based on the detected phase shift, wherein the output power is based on the impedance of the tunable antenna matching circuit and the at least one input signal to the RF power amplifier.
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Specification