Amplification circuit
AssigneeMurata Manufacturing Co., Ltd.
InventorsMakoto Tabei, Daisuke Watanabe
Life of this patent
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Abstract
Provided is an amplification circuit that amplifies an input signal and outputs an amplified signal. The amplification circuit includes: an amplification element that outputs the amplified signal from an output terminal thereof; an inductor having one end to which a power supply voltage is supplied and another end that is connected to the output terminal of the amplification element; a variable resistor that is connected in parallel with the inductor; and a resistance value adjusting circuit that adjusts a resistance value of the variable resistor in accordance with the temperature.
Claims5
An amplification circuit that amplifies an input signal and outputs an amplified signal, the amplification circuit comprising:
- an amplifier configured to output the amplified signal from an output terminal;
- a variable resistance element connected between the output terminal and a power supply voltage;
- and
- a resistance value adjusting circuit that is configured to adjust a resistance value of the variable resistance element,
- wherein the variable resistance element comprises a first field-effect transistor (FET),
- wherein the resistance value adjusting circuit comprises:
- a first current generating circuit configured to generate a first current,
- a second FET that is diode connected and through which the first current flows, and
- a first voltage generating circuit configured to generate a first voltage that changes in accordance with a gate voltage of the second FET, and
- wherein the resistance value adjusting circuit is configured to adjust a gate voltage of the first FET based on the first voltage.
Dependencies are inferred from the claim text.