Rail-to-rail class-AB buffer amplifier with compact adaptive biasing

A rail-to-rail class-AB buffer amplifier using compact adaptive biasing, the rail-to-rail class-AB buffer amplifier comprising:

• an input stage configured to generate a differential current pair based on a voltage difference between a first input signal and a second input signal;
• an amplification stage configured to output a driving signal based on the differential current pair;
• an output stage connected to the amplification stage and configured to output an output signal;
• an auxiliary current source switch which is configured to be on/off based on the driving signal output by the amplification stage;
• and
• a current mirroring unit configured to generate dynamic bias current and output the generated dynamic bias current to the input stage based on the auxiliary current source switch being on,
• wherein the auxiliary current source switch comprises a transistor, and
• wherein the driving signal is directly input into a gate of the transistor.