Patent ID: 8860523

Claim:
An amplifier circuit comprising: a first output node and second output node which drive an output load external to the amplifier; a first smoothing circuit which smoothes a signal at the first output node; a second smoothing circuit which smoothes a signal at the second output node; a first error amplification circuit which generates a signal indicative of difference of the output signal of the first smoothing circuit and an externally-supplied signal corresponding to an input signal; a second error amplification circuit which generates a signal indicative of difference of the output signal of the second smoothing circuit and the externally-supplied signal corresponding to the input signal; a triangular-wave generation circuit which generates a triangular-wave signal with a gradient; a triangular-wave correction circuit which receives the triangular-wave signal, controls the gradient of the triangular-wave signal according to the voltage level of the triangular-wave signal and outputs a corrected triangular-wave signal; a first comparison circuit which compares the corrected triangular-wave signal with the output signal of the first error amplification circuit, and outputs a signal corresponding to the comparison result; a second comparison circuit which compares the corrected triangular-wave signal with the output signal of the second error amplification circuit, and outputs a signal corresponding to the comparison result; a first output circuit which performs charge and discharge to the first output node according to the output signal of the first comparison circuit; and a second output circuit which performs charge and discharge to the second output node according to the output signal of the second comparison circuit.