Murata Manufacturing Co., Ltd.

Renesas Technology Corp.

Yusuke Shimamune

Fuminori Morisawa

Shota Ishihara

Seiko Ono

Takayuki Tsutsui

Yuri Honda

Takashi Soga

Shizuki Nakajima

Kazuhiro Koshio

Masato Sato

Satoshi Tanaka

Tetsuaki Adachi

Kazuhito Nakai

Hayato Nakamura

Tomio Furuya

Norio Hayashi

Kyoichi Takahashi

Yasunobu Yoshizaki

Shuji Tomono

Hiroki Sugiyama

Provided is a power amplification module that includes: an amplification transistor that has a constant power supply voltage supplied to a collector thereof, a bias current supplied to a base thereof and that amplifies an input signal input to the base thereof and outputs an amplified signal from the collector thereof; a first current source that outputs a first current that corresponds to a level control voltage that is for controlling a signal level of the amplified signal; and a bias transistor that has the first current supplied to a collector thereof, a bias control voltage connected to a base thereof and that outputs the bias current from an emitter thereof.

Power amplification module

A differential amplifier circuit includes a differential pair including a first field-effect transistor (FET) and a second FET, a first current source that generates a current which flows in the first FET and the second FET, and an output circuit that outputs an output voltage corresponding to a difference between a gate voltage of the first FET and a gate voltage of the second FET in accordance with an operation of the differential pair. A back gate of the first FET is connected to a gate of the first FET, and a back gate of the second FET is connected to a gate of the second FET. A first feedback voltage corresponding to the output voltage is input to the gate of the second FET.

Differential amplifier circuit

Provided is a current output circuit that includes: a first FET that has a power supply voltage supplied to a source thereof, that has a first voltage supplied to a gate thereof and that outputs a first current from a drain thereof; a second FET that has the power supply voltage supplied to a source thereof, that has the first voltage supplied to a gate thereof and that outputs an output current from a drain thereof; a first control circuit that controls the first voltage such that the first current comes to be at a target level; and a second control circuit that performs control such that a drain voltage of the first FET and a drain voltage of the second FET are made equal to each other.

Current output circuit

A power amplifier module includes an amplifier that amplifies an input signal and outputs an amplified signal, an emitter follower transistor that supplies a bias signal to the amplifier to control a bias point of the amplifier, and a current source that supplies a control current which changes in accordance with a change in control voltage to a collector of the emitter follower transistor. The current source limits the control current to not greater than an upper limit.

Power amplifier module

A power amplifier module includes a first current source that outputs a first current corresponding to a level control voltage for controlling a signal level of an amplified signal, a second current source that outputs a second current corresponding to the level control voltage, a first transistor in which an input signal and a first bias current are supplied to a base and an emitter is grounded, a second transistor in which an emitter is connected to a collector of the first transistor, the second current is supplied to a base, and a first amplified signal obtained by amplifying the input signal is output from a collector, and a third transistor in which the first current is supplied to a collector, a bias control current or voltage is supplied to a base, and the first bias current is supplied from an emitter to the base of the first transistor.

An output circuit includes a first transistor, a second transistor, an operational amplifier that outputs a control voltage, and a switch circuit that controls voltage output in accordance with a control signal. When the control signal is in a first state, the switch circuit supplies the control voltage to the gate of the first transistor to turn on the first transistor and electrically connects the drain of first transistor to the operational amplifier so that a first output voltage is output from the drain of the first transistor. When the control signal is in a second state, the switch circuit supplies the control voltage to the gate of the second transistor to turn on the second transistor and electrically connects the drain of the second transistor to the operational amplifier so that a second output voltage is output from the drain of the second transistor.

Output circuit

A voltage regulator circuit includes: an output transistor that controls an output voltage by making an output current flow between first and second electrodes in accordance with a first differential voltage, which is a difference between first and second voltages of the first and third electrodes; an operational amplifier that controls the second voltage such that the output voltage comes to be at a target level; an initiation circuit that maintains the second voltage at the third voltage such that the output transistor is off before initiation of the voltage regulator circuit and that allows the second voltage to be controlled by the operational amplifier after initiation of the voltage regulator circuit; and a current output circuit that outputs an adjustment current from the third electrode or to the third electrode such that the first differential voltage becomes larger when the output voltage is less than a prescribed level.

Voltage regulator circuit

In a semiconductor integrated circuit apparatus and a radio-frequency power amplifier module, a log detection portion including multiple-stage amplifier circuits, multiple level detection circuits, adder circuits, and a linear detection portion including a level detection circuit are provided. Output current from the log detection portion and output current from the linear detection portion are multiplied by different coefficients and the results of the multiplication are added to each other to realize the multiple detection methods. For example, current resulting from multiplication of the output current from the log detection portion by &#xd7;6/5 is added to the output current from the linear detection portion to realize a log detection method and, current resulting from multiplication of the output current from the log detection portion by &#xd7;&#x2155; is added to current resulting from multiplication of the output current from the linear detection portion by &#xd7;3 to realize a log-linear detection method.

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Kyoto, Japan

Yusuke Shimamune