Voltage adjusting circuit for amplifier circuit and method thereof

A voltage adjusting method of an amplifier circuit for providing a first power signal and a second power signal to the amplifier circuit so that the amplifier circuit provides an output signal to a load according to an input signal, the first power signal and the second power signal, comprising:

• in a first time period, configuring the first power signal to be a first signal value and configuring the second power signal to be a second signal value by utilizing a reference voltage generating circuit;
• generating a difference signal by utilizing a subtractor circuit according to at least one of the first power signal and the second power signal and according to the output signal;
• generating a first threshold signal by utilizing a threshold generating circuit;
• comparing the first threshold signal and the difference signal by utilizing a comparator circuit;
• and
• when the difference signal is greater than the first threshold signal, configuring the reference signal generating circuit to configure the first power signal to be a third signal value and configure the second power signal to be a fourth signal value in a second time period;
• wherein the third signal value is less than the first signal value and the fourth signal value is greater than or equal to the second signal value.

A voltage adjusting circuit, configured to operably provide a first power signal and a second power signal to an amplifier circuit so that the amplifier circuit provides an output signal to a load according to an input signal, the first power signal and the second power signal, comprising:

• a reference voltage generating circuit configured to operably configure the first power signal to be a first signal value and configure the second power signal to be a second signal value in a first time period;
• a subtractor circuit coupled with the reference voltage generating circuit for generating a difference signal according to at least one of the first power signal and the second power signal and according to the output signal;
• a threshold generating circuit configured to operably generate a first threshold signal;
• and
• a comparator circuit coupled with the threshold generating circuit and the subtractor circuit for comparing the first threshold signal and the difference signal;
• wherein when the difference signal is greater than the first threshold signal, the comparator circuit configures the reference signal generating circuit to configure the first power signal to be a third signal value and configure the second power signal to be a fourth signal value in a second time period;
• the third signal value is less than or equal to the first signal value;
• and the fourth signal value is greater than the second signal value.