Transmitter and communication apparatus

A transmitter for generating and outputting a transmitted signal based on inputted data, comprising:

• a signal generation section operable to generate an amplitude signal and an angle-modulated signal based on an amplitude component and a phase component that are obtained by performing signal processing on the data and operable to output power information set based on a baseband of the transmitter;
• a multiplication section operable to multiply the amplitude signal by the power information;
• an adaptive compensation filter operable to select filter values corresponding to a magnitude of the signal outputted from the multiplication section and operable to perform waveform shaping on the signal, outputted from the multiplication section, in accordance with characteristics obtained from the selected filter values;
• an amplitude amplification section operable to output a signal corresponding to a magnitude of the signal subjected to waveform shaping in the adaptive compensation filter;
• and
• an amplitude modulation section operable to amplitude-modulate the angle-modulated signal by the signal outputted from the amplitude amplification section and operable to output the resulting signal as a modulated signal,
• the characteristics, obtained from the selected filter values in the adaptive compensation filter, being inverse characteristics of transfer characteristics from an input of the amplitude amplification section to an output of the amplitude modulation section.

A transmitter for generating and outputting a transmitted signal based on inputted data, comprising:

• a signal generation section operable to generate an amplitude signal and an angle-modulated signal based on an amplitude component and a phase component that are obtained by performing signal processing on the data and operable to output power information set based on a baseband of the transmitter;
• an adaptive compensation filter operable to select filter values corresponding to a magnitude of the amplitude signal and the power information and operable to perform waveform shaping on the amplitude signal in accordance with characteristics obtained from the selected filter values;
• a multiplication section operable to multiply the signal subjected to waveform shaping in the adaptive compensation filter by the power information;
• an amplitude amplification section operable to output a signal corresponding to a magnitude of the signal outputted from the multiplication section;
• and
• an amplitude modulation section operable to amplitude-modulate the angle-modulated signal by the signal outputted from the amplitude amplification section and operable to output the resulting signal as a modulated signal,
• the characteristics, obtained from the selected filter values in the adaptive compensation filter, being inverse characteristics of transfer characteristics from an input of the amplitude amplification section to an output of the amplitude modulation section.

A transmitter for generating and outputting a transmitted signal based on inputted data, comprising:

• a signal generation section operable to generate an amplitude signal and an angle-modulated signal based on an amplitude component and a phase component that are obtained by performing signal processing on the data;
• an adaptive compensation filter operable to select filter values corresponding to a magnitude of the amplitude signal and operable to perform waveform shaping on the amplitude signal in accordance with characteristics obtained from the selected filter values;
• an amplitude calculation section operable to perform a predetermined calculation on the signal subjected to waveform shaping in the adaptive compensation filter and operable to output the resulting signal;
• a switching regulator operable to receive the output signal from the amplitude calculation section and operable to output a voltage controlled by the output signal;
• a series regulator operable to receive the voltage outputted from the switching regulator and operable to output a signal corresponding to a magnitude of the signal subjected to waveform shaping in the adaptive compensation filter;
• and
• an amplitude modulation section operable to amplitude-modulate the angle-modulated signal by the signal outputted from series regulator and operable to output the resulting signal as a modulated signal,
• the characteristics, obtained from the selected filter values in the adaptive compensation filter, being inverse characteristics of transfer characteristics from an input of the switching regulator to an output of the amplitude modulation section.