Tunable matching circuits for power amplifiers
First Claim
1. An apparatus comprising:
- a power amplifier amplifying an input radio frequency (RF) signal and providing an amplified RF signal;
a tunable matching circuit coupled to the power amplifier and providing output impedance matching for the power amplifier, the tunable matching circuit receiving the amplified RF signal and providing an output RF signal, the tunable matching circuit being adaptively tunable to a setting based on at least one parameter affecting operation of the power amplifier, the setting causing a power efficiency of the power amplifier to be greater than a power efficiency at a different setting; and
at least one sensor coupled to each of an output of the power amplifier and an output of the tunable matching circuit and configured to measure at least one property of each of the amplified RF signal and the output RF signal.
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Accused Products
Abstract
Tunable matching circuits for power amplifiers are described. In an exemplary design, an apparatus may include a power amplifier and a tunable matching circuit. The power amplifier may amplify an input RF signal and provide an amplified RF signal. The tunable matching circuit may provide output impedance matching for the power amplifier, may receive the amplified RF signal and provide an output RF signal, and may be tunable based on at least one parameter effecting the operation of the power amplifier. The parameter(s) may include an envelope signal for the amplified RF signal, an average output power level of the output RF signal, a power supply voltage for the power amplifier, IC process variations, etc. The tunable matching circuit may include a series variable capacitor and/or a shunt variable capacitor. Each variable capacitor may be tunable based on a control generated based on the parameter(s).
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Citations
22 Claims
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1. An apparatus comprising:
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a power amplifier amplifying an input radio frequency (RF) signal and providing an amplified RF signal; a tunable matching circuit coupled to the power amplifier and providing output impedance matching for the power amplifier, the tunable matching circuit receiving the amplified RF signal and providing an output RF signal, the tunable matching circuit being adaptively tunable to a setting based on at least one parameter affecting operation of the power amplifier, the setting causing a power efficiency of the power amplifier to be greater than a power efficiency at a different setting; and at least one sensor coupled to each of an output of the power amplifier and an output of the tunable matching circuit and configured to measure at least one property of each of the amplified RF signal and the output RF signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 14)
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15. A wireless device comprising:
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a power amplifier amplifying an input radio frequency (RF) signal and providing an amplified RF signal; a tunable matching circuit coupled to the power amplifier and providing output impedance matching for the power amplifier, the tunable matching circuit receiving the amplified RF signal and providing an output RF signal; at least one sensor coupled to each of an output of the power amplifier and an output of the tunable matching circuit and configured to measure at least one property of each of the amplified RF signal and the output RF signal; and a control unit generating a control to adjust the tunable matching circuit to a setting based on at least one parameter affecting operation of the power amplifier, the setting causing a power efficiency of the power amplifier to be greater than a power efficiency at a different setting. - View Dependent Claims (16, 17)
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18. A method of performing signal amplification, comprising:
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amplifying an input radio frequency (RF) signal with a power amplifier to obtain an amplified RF signal; performing output impedance matching for the power amplifier with a tunable matching circuit; sensing at least one property of each of the amplifier RF signal and an output of the tunable matching circuit; and adaptively adjusting the tunable matching circuit to a setting based on at least one parameter affecting operation of the power amplifier, the setting causing a power efficiency of the power amplifier to be greater than a power efficiency at a different setting. - View Dependent Claims (19, 20, 21)
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22. An apparatus comprising:
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means for amplifying an input radio frequency (RF) signal to obtain an amplified RF signal; means for matching an output impedance of the means for amplifying; means for sensing at least one property of each of the amplifier RF signal and an output of the tunable matching circuit; and means for adaptively adjusting the means for matching the output impedance to a setting based on at least one parameter affecting operation of the means for amplifying, the setting causing a power efficiency of the means for amplifying to be greater than a power efficiency at a different setting.
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Specification