Murata Manufacturing Co., Ltd.

Murata Manufacturingco., Ltd.

Yuri Honda

Fumio Harima

Satoshi Tanaka

Fuminori Morisawa

Shota Ishihara

Satoshi Goto

Yoshiki Kogushi

Kenji Mukai

Masatoshi Hase

Kazuo Watanabe

Takashi Soga

Yusuke Shimamune

Shizuki Nakajima

Seiko Ono

Kazuhiro Koshio

Masato Sato

Kazuhito Nakai

Jun Enomoto

Yasuhisa Yamamoto

Kenichi Shimamoto

Takashi Yamada

Hisanori Namie

Mizuho Ishikawa

Yoshiaki Sukemori

Hideyuki Satou

Toshikazu Terashima

Takeyuki Okabe

Hiroki Shonai

Mitsuhiro Toya

A power amplifier circuit includes a first transistor having the base coupled to an input terminal, the collector coupled to an output terminal, and the emitter coupled to ground, a first bias circuit coupled to the base of the first transistor via the first resistance element, a second transistor having the base coupled to the input terminal, the collector coupled to the output terminal, and the emitter coupled to ground, a second bias circuit coupled to the base of the second transistor via the second resistance element, and a first impedance circuit having a first end coupled between the base of the first transistor and the input terminal and a second end coupled between the first bias circuit and the first resistance element and being configured to be opened for a direct-current component and to be closed for an alternating-current component.

Power amplifier circuit

A power amplifying circuit includes a first amplifier, a second amplifier, a transformer having a primary winding and a secondary winding, and a capacitor. The first amplifier amplifies a signal which is one of differential signals. The second amplifier amplifies a signal which is the other of the differential signals. The primary winding is connected, at its first end, to the first amplifier, and is connected, at its second end, to the second amplifier. The secondary winding is connected, at its first end, to an unbalanced line through which an unbalanced signal is transmitted, and is connected, at its second end, to the ground. The secondary winding is electromagnetically coupled to the primary winding. The capacitor is connected, at its first end, to the midpoint of the primary winding, and is connected, at its second end, to the ground.

Power amplifying circuit

A power amplifier circuit includes a differential amplifier circuit configured to amplify a radio-frequency signal, a transformer disposed on an output side with respect to the differential amplifier circuit and including a primary winding and a secondary winding, and a dispersion circuit coupled to a midpoint of the primary winding of the transformer and configured to operate as an adjustment circuit. The dispersion circuit is configured to adjust, based on a supply voltage controlled in accordance with the envelope of the radio-frequency signal, a bias (bias current or bias voltage) to be supplied to the differential amplifier circuit.

A power amplifier circuit according to the present disclosure includes an amplifier circuit serving as a differential amplifier circuit configured to be activated by a supply voltage that is variable in accordance with amplitude of a signal, a bias circuit configured to output a bias to be supplied to the amplifier circuit, and first and second dispersion circuits respectively provided for a pair of differential signals outputted from the amplifier circuit and configured to control dependence of gain of the differential amplifier circuit on the supply voltage.

A power amplifier circuit includes: a high pass filter that has one end into which a high frequency input signal is inputted; a first amplifier that amplifies the high frequency input signal outputted from the other end of the high pass filter and outputs a high frequency signal obtained through the first amplification; a second amplifier that amplifies the high frequency signal and outputs a high frequency output signal obtained through the second amplification; an automatic transformer that performs impedance matching between the first amplifier and the second amplifier; and an impedance circuit, one end of which is electrically connected with the other end of the high pass filter, the other end of which is electrically connected with an output terminal of a bias circuit outputting bias voltage or bias current to the first amplifier, and that outputs the high frequency input signal to the bias circuit.

A balun includes: first wiring that has a first end connected to a first balanced line and a second end connected to a second balanced line; second wiring that has a grounded first end and a second end; third wiring that has a first end connected to the second end of the second wiring and a second end connected to an unbalanced line and is electromagnetically coupled to the second wiring; a first capacitor that has a first end connected to the first end of the third wiring and a grounded second end; and a second capacitor that has a first end connected to the second end of the third wiring and a grounded second end. The first wiring is electromagnetically coupled to at least one of the second wiring and the third wiring.

Balun

A power amplification circuit includes a first amplifier that amplifies a signal split from an input signal, a second amplifier that amplifies a signal having a different phase from the aforementioned signal, third and fourth amplifiers, and a matching network. The matching network includes a first wiring having a first end connected to an output terminal of the first amplifier and a second end connected to an input terminal of the third amplifier, a second wiring having a first end connected to the input terminal of the third amplifier, and electromagnetically coupled to the first wiring, a third wiring having a first end connected to an output terminal of the second amplifier and a second end connected to an input terminal of the fourth amplifier, and a fourth wiring having a first end connected to the input terminal of the fourth amplifier, and electromagnetically coupled to the third wiring.

Power amplification circuit and semiconductor device

A differential amplifier circuit includes a first and second amplifiers that output a differential signal in a radio-frequency band, a first inductor having a first end connected to an output end of the first amplifier, a second inductor having a first end connected to an output end of the second amplifier, a choke inductor connected to second ends of the first and second inductors, a first and second capacitors, and a switch that connects the second capacitor in parallel to the first capacitor or terminates a parallel connection of the first and second capacitors. A resonant circuit formed by connecting the first or second inductor in series with the first capacitor has a different resonant frequency from a resonant circuit formed by connecting the first or second inductor in series with the parallel-connected first and second capacitors. These resonant frequencies correspond to second harmonic frequencies of the differential signal.

Differential amplifier circuit

A power amplifier circuit has an input node from which an input signal, which is a high-frequency signal, is inputted and an output node to which the input signal is amplified by a differential amplifier circuit to be outputted as an output signal. The power amplifier circuit includes a balun transformer (second balun transformer) including an input-side winding that has a substantially center to which a power-supply voltage is supplied and that is connected between differential outputs of the differential amplifier circuit, and an output-side winding that is coupled to the input-side winding via an electromagnetic field and that has one end connected to a reference potential; and a capacitive element (capacitor) provided between another end (node) of the output-side winding and the output node.

A power amplifier circuit includes a first transistor configured to receive a first signal at a base, amplify the first signal, and output a second signal from a collector; and a bias circuit configured to supply a bias current to the base of the first transistor. The bias circuit includes a second transistor configured to supply a bias current to the base of the first transistor, a third transistor including a base connected to a base of the second transistor and a collector connected to a collector of the second transistor, and a fourth transistor including a base connected to an emitter of the third transistor and a collector connected to an emitter of the second transistor and configured to draw at least part of the bias current.

A power amplifier circuit includes a power splitter, a first amplifier configured to output a first amplified signal from a first output terminal, and a second amplifier configured to output a second amplified signal from a second output terminal. The power amplifier circuit further includes a first termination circuit connected between the first output terminal and the second output terminal, a first transmission line, a second transmission line, a second termination circuit connected between another end of the first transmission line and another end of the second transmission line, and a power combiner.

A power amplifier circuit includes an amplifier transistor having a base, a collector, a bias circuit, and a first resistance element connected between the base of the amplifier transistor and the bias circuit. The bias circuit includes a voltage generation circuit, a first transistor having a base to which a first direct-current voltage is supplied, and an emitter from which the bias current or voltage is supplied, a second transistor having a base to which a second direct-current voltage is supplied, and an emitter connected to the emitter of the first transistor, a signal supply circuit disposed between the base of the amplifier transistor and the base of the second transistor, and an impedance circuit disposed between the base of the first transistor and the base of the second transistor.

The present disclosure provides a power amplifier circuit capable of suppressing the occurrence of noises while enabling control of an output power level. The power amplifier circuit includes a first transistor that amplifies a first signal; a bias circuit that supplies a bias current or voltage based on a control signal to the first transistor; a second transistor to which a control current based on the control signal is supplied, which has an emitter or a source thereof connected to a collector or a drain of the first transistor, and from which a second signal obtained by amplifying the first signal is output; and a first feedback circuit provided between the collector or the drain of the second transistor and the base or the gate of the second transistor.

A power amplifier includes power amplification circuits in a plurality of stages including a first stage and a second stage, each power amplification circuit including a transistor. The power amplification circuit in the first stage includes a first impedance circuit between an emitter of the transistor and a reference potential. The first impedance circuit has an impedance that does not vary with frequency or an impedance that varies with frequency. The power amplification circuit in the second stage includes a second impedance circuit between an emitter of the transistor and a reference potential. The second impedance circuit has an impedance that does not vary with frequency or an impedance that varies with frequency.

Power amplifier

A power amplifier circuit includes an amplifier transistor, a bias circuit that supplies a bias current or voltage to the amplifier transistor, and a resistance element connected between a base of the amplifier transistor and the bias circuit. The bias circuit includes a voltage generation circuit, a first transistor having a base to which a first direct-current voltage is supplied and an emitter from which the bias current or voltage is supplied, a second transistor having a base to which a second direct-current voltage is supplied and an emitter connected to the emitter of the first transistor, a signal supply circuit that supplies an input signal to the base of the second transistor, and an impedance circuit disposed between the base of the first transistor and the base of the second transistor.

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Kyoto, Japan

Yuri Honda