Hybrid differential amplifier with high linearity and method thereof

A hybrid differential amplifier, configured to generate a differential output signal based on a differential input signal for driving a load, wherein the differential input signal has a fundamental frequency, the hybrid differential amplifier comprising:

• a first amplifier, configured as an inductive switching converter and configured to perform pulse width modulation (PWM) conversion based on a first input signal of the differential input signal to switch an inductor and generate a first output signal of the differential output signal;
• and
• a second amplifier, configured to generate a second output signal of the differential output signal based on a second input signal of the differential input signal;
• wherein the second amplifier is configured as another type of amplifier different from the inductive switching converter;
• wherein one of the first amplifier or the second amplifier is further configured to generate the first output signal or the second output signal based on feedback from the differential output signal, such that the differential output signal is linearly related to the differential input signal;
• wherein the other one of the first amplifier or the second amplifier is further configured to perform a quantization processing operation on the first input signal or the second input signal, such that the second output signal includes a staircase wave related to the fundamental frequency, wherein the staircase wave includes at least three quantized output levels;
• wherein the quantization processing operation includes:
• generating a quantized output signal based on the first input signal or the second input signal and at least one quantization threshold level, such that the second output signal includes the staircase wave.