Amplifying device and signal processing device
Signal timing adjustment in an amplifying device is appropriately performed by phase adjustment by a digital filter. The amplifying device includes an amplifier; an amplitude-voltage converting unit 12 that performs a desired process on a signal relating to operation of the amplifier, whereby the signal is band-broadened; and a timing adjusting unit 15 a that performs timing adjustment of the signal to be provided to the amplifier, by phase adjustment by a digital filter. The timing adjusting unit 15 a performs the timing adjustment of the signal at a stage before the signal is band-broadened by the amplitude-voltage converting unit 12.
1. An amplifying device comprising:
an amplifier;
a signal processing unit that converts an envelope signal of the input signal to be provided to an input of the amplifier into a power supply voltage value of the amplifier, and band-broadens the envelope signal upon the conversion;
a timing adjusting unit that performs timing adjustment on the envelope signal by phase adjustment by a digital filter; and
a detecting unit that performs detection on the input signal to generate the envelope signal; wherein
the timing adjusting unit is provided to perform the timing adjustment of the envelope signal at a stage before the envelope signal is band-broadened by the signal processing unit, and
the detecting unit is configured to output an envelope signal generated considering a value obtained by computation of (I 2 +Q 2 ) as an amplitude value, when values of an I signal and a Q signal forming the input signal are represented by I and Q, respectively.
2. The amplifying device according to claim 1 , wherein
the timing adjustment by the timing adjusting unit is performed to allow timing of an input signal to be provided to an input of the amplifier to coincide with timing of the envelope signal of the input signal.
3. An amplifying device comprising:
an amplifier;
a detecting unit that performs detection on an input signal to generate an envelope signal;
a converting unit that converts the envelope signal into a power supply voltage value of the amplifier; and
a timing adjusting unit that performs timing adjustment on the envelope signal by phase adjustment by a digital filter, wherein
the detecting unit is configured to output an envelope signal generated considering a value obtained by computation of (I 2 +Q 2 ) as an amplitude value, when values of an I signal and a Q signal forming the input signal are represented by I and Q, respectively.
4. The amplifying device according to claim 3 , wherein
the digital filter has substantially ideal characteristics where a phase of a signal in a frequency band in a predetermined range is changed as desired for timing adjustment, and
a frequency band of the signal on which timing adjustment is performed by the timing adjusting unit is substantially within the frequency band in the predetermined range.
5. The amplifying device according to claim 1 , wherein
the digital filter has substantially ideal characteristics where a phase of a signal in a frequency band in a predetermined range is changed as desired for timing adjustment, and
a frequency band of the signal on which timing adjustment is performed by the timing adjusting unit is substantially within the frequency band in the predetermined range.