Methods and Devices for Improving Power Amplifier Efficiency
AssigneePeregrine Semiconductor Corporation
InventorMichael P. Gaynor
Life of this patent
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Abstract
Devices and methods to reduce adjacent channel power of an amplifier are described. The adjacent channel power can be reduced by considering the third harmonic output from the amplifier, and minimizing such third harmonic amplitude by implementing a phase shifter feedback circuit to the amplifier. The phase shifter feedback circuit can shift the phase of the feedback signal in order to reduce the third harmonic amplitude, which in turn reduces the adjacent channel power.
Claims23
A method for increasing efficiency of a power amplifier circuit, comprising:
- providing the power amplifier circuit with a feedback arrangement, the feedback arrangement comprising a phase shifter;
- measuring with a control circuit, an odd harmonic amplitude from an output of the power amplifier circuit;
- and
- adjusting the phase shifter upon measurement of the odd harmonic amplitude in order to minimize the odd harmonic amplitude through the feedback arrangement.
A method for reducing an adjacent channel power of a power amplifier, comprising:
- providing a power amplifier circuit with a feedback arrangement, the feedback arrangement comprising a phase shifter;
- operatively coupling a coupler to the power amplifier;
- measuring via the coupler a parameter indicative of the adjacent channel power;
- based on the measuring, generating an error signal for the phase shifter;
- feeding the error signal to the phase shifter;
- based on the feeding, shifting an input phase of an input signal to the power amplifier, and
- based on the shifting, reducing an adjacent channel power.
A circuital arrangement comprising:
- a feedback circuit comprising a phase shifter;
- and
- a control circuit adapted to measure an odd harmonic amplitude, the control circuit connected to a control signal input of the phase shifter,
- wherein the phase shifter is adjustable according to an amount of the odd harmonic amplitude measured by the control circuit.
A circuital arrangement to reduce adjacent channel power of a power amplifier comprising:
- a power amplifier feedback circuit comprising a phase shifter, the phase shifter being connected from an output of the power amplifier to an input of the power amplifier;
- and
- a coupler to the power amplifier, the coupler measuring a power amplifier parameter indicative of the adjacent channel power and configured to send a control signal to a control signal input of the phase shifter, the phase shifter shifting phase of an input to the power amplifier in accordance with the measured power amplifier parameter, in order to reduce an amount of the power amplified parameter, thus reducing the adjacent channel power.
Dependencies are inferred from the claim text.