Class ab amplifier

A class AB amplifier comprising:

• an input chopper switch circuit that receives first and second differential input signals via first and second input terminals, performs a chopping operation in synchronization with first and second chopper clock signals, and outputs first and second modulated signals obtained by modulating the first and second differential input signals to first and second nodes;
• an input amplifier circuit that receives the first and second modulated signals via the first and second nodes, and outputs differentially amplified signals obtained by amplifying the first and second modulated signals;
• an output chopper switch circuit that receives the differentially amplified signals, performs a chopping operation in synchronization with the first and second chopper clock signals, and modulates the differentially amplified signals to output demodulated signals demodulated to the frequency bands of the first and second differential input signals;
• and
• an output amplifier circuit that receives the demodulated signals, and outputs a first output signal obtained by amplifying the demodulated signals via a first output terminal.