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US 9,960,947 B2Granted
Compensation circuit of power amplifier and associated compensation method
AssigneeMediatek Inc.
InventorsChien-Cheng Lin, Ming-Da Tsai
Life of this patent
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Abstract
A compensation circuit of a power amplifier includes a varactor, a voltage sensor and a control circuit. The varactor is coupled to an input terminal of the power amplifier. The voltage sensor is arranged for detecting an amplitude of an input signal of the power amplifier to generate a detecting result. The control circuit is coupled to the varactor and the voltage sensor, and is arranged for controlling a bias voltage of the varactor to adjust a capacitance of the varactor according to the detecting result.
Claims24
A compensation circuit of an amplifier, comprising:
- a first varactor, coupled to a first input terminal of the amplifier;
- a second varactor, coupled to a second input terminal of the amplifier;
- a voltage sensor, for detecting an amplitude of an input signal of the amplifier to generate a detecting result;
- and
- a control circuit, coupled to the first varactor, the second varactor and the voltage sensor, for controlling a bias voltage of the first varactor to adjust a capacitance of the first varactor according to the detecting result, and controlling a bias voltage of the second varactor to adjust a capacitance of the second varactor according to the detecting result.
2 more elements
A circuit, comprising:
- a power amplifier;
- and
- a compensation circuit comprising:
- a first varactor, coupled to a first input terminal of the power amplifier;
- a second varactor, coupled to a second input terminal of the power amplifier;
- a voltage sensor, for detecting an amplitude of an input signal of the power amplifier to generate a detecting result;
- and
- a control circuit, coupled to the first varactor, the second varactor and the voltage sensor, for controlling a bias voltage of the first varactor to adjust a capacitance of the first varactor according to the detecting result, and controlling a bias voltage of the second varactor to adjust a capacitance of the second varactor according to the detecting result.
5 more elements
A compensation circuit of an amplifier, comprising:
- a first varactor, coupled to a first input terminal of the amplifier;
- a voltage sensor, for detecting an amplitude of an input signal of the amplifier to generate a detecting result;
- and
- a control circuit, coupled to the first varactor and the voltage sensor, for controlling a bias voltage of the first varactor to adjust a capacitance of the first varactor according to the detecting result;
- wherein a transformer is arranged to provide the input signal to the input terminal of the amplifier, and the compensation circuit further comprises:
- another voltage sensor, for detecting the amplitude of an input signal of the amplifier to generate another detecting result;
- and
- another control circuit, coupled to the other voltage sensor, for controlling a voltage level of a center tap of the transformer according to the other detecting result.
5 more elements
A circuit, comprising:
- a power amplifier;
- and
- a compensation circuit comprising:
- a first varactor, coupled to a first input terminal of the power amplifier;
- a voltage sensor, for detecting an amplitude of an input signal of the power amplifier to generate a detecting result;
- and
- a control circuit, coupled to the first varactor and the voltage sensor, for controlling a bias voltage of the first varactor to adjust a capacitance of the first varactor according to the detecting result;
- wherein a transformer is arranged to provide the input signal to the input terminal of the power amplifier, and the compensation circuit further comprises:
- another voltage sensor, for detecting the amplitude of an input signal of the power amplifier to generate another detecting result;
- and
- another control circuit, coupled to the other voltage sensor, for controlling a voltage level of a center tap of the transformer according to the other detecting result.
8 more elements
Dependencies are inferred from the claim text.