I want to make phase controller for a power amplifier. Its output phase should be constant with respect to the input signal phase regardless of the phase change of the amplifier due to power supply fluctuation, temperature change and aging or due to any other reason. I will have to design a phase control loop. Can anyone suggest how to do that? Any relevant paper or document?
The phase of a power amplifier doesn't change with frequencies in its bandpass. Very low or very high frequencies might have their phase changed a little by changes in power suppply voltage, twmperature or aging but it doesn't matter.