Multistage amplifier apparatus with distortion compensation function
Provided are an amplifier section in which N amplifiers (N is an integer of 2 or more) are serially connected to one another, and which performs an amplitude modulation on an input signal using an amplitude signal, which is a control signal; and M distortion compensation apparatuses (M is a natural number satisfying M<N) which are respectively provided to M amplifiers of the N amplifiers, each of which retains a distortion compensation table in which a voltage of the amplitude signal and a distortion compensated voltage are correlated with each other, and provides the distortion compensated voltage which is correlated with the control signal, to a power supply terminal of a corresponding amplifier of the M amplifiers in accordance with the distortion compensation table. To power supply terminals of (N−M) amplifiers of the N amplifiers, to which the distortion compensated voltage is not inputted by any of the M distortion compensation apparatuses, the voltage of the power supply terminal is directly provided.
1. A multistage amplifier apparatus for amplifying an input signal using a control signal, the multistage amplifier apparatus comprising:
an amplifier section in which N amplifiers (N is an integer of 2 or more) are serially connected to one another, for performing amplitude modulation on the input signal using an amplitude signal which is the control signal; and
M distortion compensation apparatuses (M is a natural number satisfying M<N) which are provided so as to respectively correspond to M amplifiers among the N amplifiers, each for retaining a distortion compensation table in which a voltage of the amplitude signal and a distortion compensated voltage are correlated with each other, and the M distortion compensation apparatuses each providing, based on the distortion compensation table, the distortion compensated voltage which is correlated with the control signal, to a power supply terminal of a corresponding amplifier of the M amplifiers, wherein
to power supply terminals of (N−M) amplifiers, to which the distortion compensated voltage is not inputted by the M distortion compensation apparatus, the voltage of the amplitude signal is directly provided.
2. The multistage amplifier apparatus according to claim 1 , wherein the distortion compensated voltage is a voltage which allows a linear relationship between the voltage of the amplitude signal and a voltage to be outputted by the amplifier section.
3. The multistage amplifier apparatus according to claim 1 , wherein the input signal is a phase-modulated signal.
4. The multistage amplifier apparatus according to claim 2 , wherein the input signal is a phase-modulated signal.
5. The multistage amplifier apparatus according to claim 1 , wherein the input signal is a frequency-modulated signal.
6. The multistage amplifier apparatus according to claim 2 , wherein the input signal is a frequency-modulated signal.
7. The multistage amplifier apparatus according to claim 1 , wherein the input signal is an amplitude-modulated signal.
8. The multistage amplifier apparatus according to claim 2 , wherein the input signal is an amplitude-modulated signal.
9. The multistage amplifier apparatus according to claim 1 , wherein the input signal is an amplitude/phase modulated signal.
10. The multistage amplifier apparatus according to claim 2 , wherein the input signal is an amplitude/phase modulated signal.
11. The multistage amplifier apparatus according to claim 1 , wherein the input signal is an amplitude/frequency modulated signal.
12. The multistage amplifier apparatus according to claim 2 , wherein the input signal is an amplitude/frequency modulated signal.
13. A polar modulation amplifier apparatus comprising:
an amplitude/phase separation section for separating a transmission signal to be inputted thereto into an amplitude signal and a phase signal;
a phase modulation section for performing phase modulation on the phase signal; and
the multistage amplifier apparatus described in claim 3 for performing, by using the amplitude signal, amplitude modulation on the phase signal on which phase modulation is performed by the phase modulation section.
14. A wireless communication apparatus for performing communication using an antenna, the wireless communication apparatus comprising:
a transmission processing section including the multistage amplifier apparatus described in claim 1 for performing transmission processing and outputting a transmission signal;
a reception processing section for performing reception processing on a received signal which is received by the antenna; and
a transmission-reception switching section for switching between a state in which the transmission signal is provided from the transmission processing section to the antenna and a state in which the received signal is provided from the antenna to the reception processing section.