Class D power amplifier

*A basic class D amplifier is composed by a comparator opamp, 2 mosfets (a N-Channel and a P-Channel), and a LC circuit; *There are 2 input signals: the signal to be amplified, and a triangular signal; *The comparator output voltage (Vc) is almost equal to +VDD or -VSS; When Va > Vt, the comparator output is +VDD. When Va < Vt, the comparator output is -VSS; *Then, Vc = +VDD, Q1 (N-Channel) is on and Q2 (P-Channel) is off. Vc = -VSS, Q1 is off and Q2 is on; *The mosfets output voltage drives the LC circuit that works as a filter; *Due to that, the output signal has the same shape of the input signal (Va), but it has a greater voltage level.