Amplifier unit
AssigneeMurata Manufacturing Co., Ltd.
InventorYasutaka Sugimoto
Life of this patent
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Abstract
An amplifier unit includes an amplifier, a bias circuit, an inductor, a variable resistor circuit, and a control circuit. The amplifier includes an amplifier transistor that amplifies an input radio-frequency signal. The bias circuit is connected to the amplifier. The inductor is connected between and in series with the amplifier and the bias circuit. The variable resistor circuit is connected to the inductor. The control circuit includes a measuring circuit and a comparison circuit. The measuring circuit measures an amplification characteristic value of the amplifier transistor. The comparison circuit compares the amplification characteristic value measured by the measuring circuit with a reference value. The control circuit controls the variable resistor circuit based on a comparison result of the comparison circuit.
Claims15
An amplifier unit comprising:
- an amplifier comprising an amplifier transistor, the amplifier transistor being configured to amplify an input radio-frequency signal;
- a bias circuit connected to the amplifier;
- an inductor connected between and in series with the amplifier and the bias circuit;
- a variable resistor circuit connected in series with the inductor;
- and
- a control circuit,
- wherein the control circuit comprises:
- a measuring circuit configured to measure an amplification characteristic value of the amplifier transistor, and
- a comparison circuit configured to compare the amplification characteristic value measured by the measuring circuit with a reference value, and
- wherein the control circuit is configured to control the variable resistor circuit based on a comparison result of the comparison circuit.
Dependencies are inferred from the claim text.