Patent ID: 8174316

Claim:
A switching amplifier comprising: a power supply (Vcc); an input circuit having first and second voltage input terminals (Va, Vb) for receiving pulse width modulation signals having opposite logic; a first driving circuit (I 1 ) and a second driving circuit (I 2 ) coupled with the first and second voltage input terminals of said input circuit respectively, said first driving circuit (I 1 ) being coupled between said input circuit first voltage input terminal (Va) and said power supply (Vcc), and said second driving circuit (I 2 ) being coupled between said input circuit first voltage input terminal (Vb) and the ground; switch transistors (M 1 , M 2 ) which are coupled with said first and second driving circuits (I 1 ) and (I 2 ) respectively, and connected with each other in series; a bootstrap circuit coupled with the first driving circuit (I 1 ) and supplying the operation voltage to the first driving circuit (I 1 ); a leakage circuit ( 3 ) connected in parallel between the common output terminal of said switch transistors (M 1 , M 2 ) and said power supply (Vcc); and a leakage circuit ( 3 ′) connected in parallel between the common output terminal of said switch transistors (M 1 , M 2 ) and the ground.