Switching power amplifier and method for amplifying a digital input signal

摘要

Switching power amplifier(1) comprising: a first signal path having a pulse modulator (7) for modulating an input signal; and a switching power unit (11) for amplifying the modulated signal to generate an amplified output signal; a second signal path for generating a reference signal in response to the input signal; and a sigma delta feedback loop having a substractor (19) for substracting the generated reference signal from the amplified input signal to generate an error signal; an analogue noise shaper (20) for integrating the error signal to generate an integrated error signal; and a quantizer (21) for converting the integrated error signal into a digital feedback signal which is fed back to the first signal path.