Output-controlled power amplifier, radio communication terminal and radio communication base station

An output-controlled power amplifier comprising:

• a variable attenuator inputted with an input signal for attenuating the power of said input signal to output the attenuated signal;
• a power amplifier connected to said variable attenuator for amplifying an output signal of said variable attenuator to output the amplified signal;
• a power divider connected to said power amplifier for dividing an output signal of said power amplifier into a plurality of outputs to provide the plurality of outputs;
• an envelope detector connected to said power divider for envelope-detecting an output signal provided by said power divider to output the envelope-detected signal;
• a temperature compensation circuit connected to said envelope detector for holding the conversion gain of said envelope detector for temperature change constant;
• a reference voltage generation circuit connected to said temperature compensation circuit for generating a reference voltage and supplying said reference voltage to said temperature compensation circuit;
• a hold circuit connected to said temperature compensation circuit for extracting and holding an output signal of said temperature compensation circuit;
• a filter connected to said hold circuit for waveform-shaping an output signal of said hold circuit to output the waveform-shaped signal;
• and
• a burst monitor circuit connected to said hold circuit for controlling said hold circuit on the basis of a burst timing signal inputted from the exterior;
• wherein said filter is connected to said variable attenuator so that said variable attenuator attenuates the power of said input signal on the basis of an output signal of said filter.

An output-controlled power amplifier comprising:

• a variable attenuator inputted with an input signal for attenuating the power of said input signal to output the attenuated signal;
• a power amplifier connected to said variable attenuator for amplifying an output signal of said variable attenuator to output the amplified signal;
• a power divider connected to said power amplifier for dividing an output signal of said power amplifier into a plurality of outputs to provide the plurality of outputs;
• an envelope detector connected to said power divider for envelope-detecting an output signal provided by said power divider to output the envelope-detected signal;
• a temperature compensation circuit connected to said envelope detector for holding the conversion gain of said envelope detector for temperature change constant;
• a first filter connected to said temperature compensation circuit for waveform-shaping an output signal of said temperature compensation circuit to output the waveform-shaped signal;
• a reference voltage generation circuit connected to said temperature compensation circuit for generating a reference voltage and supplying said reference voltage to said temperature compensation circuit;
• a hold circuit connected to said first filter for extracting and holding an output signal of said first filter;
• a second filter connected to said hold circuit for waveform-shaping an output signal of said hold circuit to output the waveform-shaped signal;
• and
• a burst monitor circuit connected to said hold circuit for controlling said hold circuit on the basis of a burst timing signal inputted from the exterior;
• wherein said second filter is connected to said variable attenuator so that said variable attenuator attenuates the power of said input signal on the basis of an output signal of said second filter.

An output-controlled power amplifier device in which a modulated input signal is inputted in the form of a burst signal to a main path and said input signal is power-attenuated, power-amplified, and thereafter outputted from said main path, comprising:

• an RF power amplifier;
• a power divider for distributing the amplified input signal between said main path and a feedback path diverging from said main path and outputting the distributed signal from said main path to the exterior;
• and
• a control signal generation circuit for generating a control signal for controlling said input signal to said RF power amplifier on the basis of the signal distributed to said feedback path, said control signal generation circuit including a hold circuit provided in said feedback path for extracting the signal distributed to said feedback path and outputting as said control signal a signal having a waveform which holds the value of the power of the extracted signal when the power reaches a predetermined value, said hold circuit being controlled at a burst timing;
• wherein said control signal generation circuit includes a reset circuit for setting the output of said hold circuit to a predetermined value corresponding to a voltage level in a halt period of said input burst signal on the basis of said burst timing.

A signal processing system comprising:

• a main path including a signal processing circuit inputted with a modulated input signal in the form of a burst signal for processing said modulated input signal to satisfy a predetermined output condition and outputting the processed signal;
• and
• a feedback path including
• a control signal generation circuit for extracting a part of the output of said main path and generating a control signal on the basis of the extracted signal, said control signal being supplied to the input side of said signal processing circuit to control the output of said signal processing circuit for said input burst signal,
• a hold circuit for receiving the signal extracted to said feedback path on the basis of a timing signal of said input burst signal and generating as said control signal a signal having a waveform which holds the value of the received signal when the signal value reaches a predetermined value, and
• a reset circuit responsive to said burst timing signal for bringing said hold circuit into a reset condition after said input burst signal is outputted from said main path to the exterior.

An output-controlled power amplifier comprising:

• a first circuit which attenuates, amplifies, and divides an input signal to produce a plurality of divisional signals, at least one of the divisional signals being output from the output-controlled power amplifier as an output signal, and another one of the divisional signals being a feedback signal;
• and
• a second circuit which subjects the feedback signal to envelope detection to produce a control signal for controlling the input signal;
• wherein the output-controlled power amplifier has a closed-loop transfer function which is substantially a Gaussian function.

An output-controlled power amplifier comprising:

• a first circuit which attenuates, amplifies, and divides an input signal to produce a plurality of divisional signals, at least one of the divisional signals being output from the output-controlled power amplifier as an output signal, and another one of the divisional signals being a feedback signal;
• and
• a second circuit which subjects the feedback signal to envelope detection to produce a control signal for controlling the input signal;
• wherein the output-controlled power amplifier has a closed-loop transfer function having a pole of substantially a Gaussian function.

An output-controlled power amplifier comprising:

• a first circuit which attenuates, amplifies, and divides an input signal to produce a plurality of divisional signals, at least one of the divisional signals being output from the output-controlled power amplifier as an output signal, and another one of the divisional signals being a feedback signal;
• and
• a second circuit which subjects the feedback signal to envelope detection and filtering to produce a control signal for controlling the input signal;
• wherein the filter is configured to make a closed-loop transfer function of the output-controlled power amplifier be substantially a Gaussian function.

An output-controlled power amplifier comprising:

• a first circuit which attenuates, amplifies, and divides an input signal to produce a plurality of divisional signals, at least one of the divisional signals being output from the output-controlled power amplifier as an output signal, and another one of the divisional signals being a feedback signal;
• and
• a second circuit which subjects the feedback signal to envelope detection and filtering to produce a control signal for controlling the input signal;
• wherein the filter is configured to make a closed-loop transfer function of the output-controlled power amplifier have a pole of substantially a Gaussian function.