Differential amplification circuit, error amplification circuit and trimming method thereof

The invention provides a differential amplification circuit, an error amplification circuit and a trimming method thereof, the differential amplification circuit comprises a first differential pair and a second differential pair, the second differential pair is coupled with the first differential pair, and the first differential pair and the second differential pair are trimmed by adjusting an input signal of the second differential pair. And the second differential pair generates trimming voltage which is equal to the offset voltage in numerical value and opposite to the offset voltage in direction so as to counteract the influence of the offset voltage. According to the differential amplification circuit, the error amplification circuit and the trimming method thereof disclosed by the invention, the trimming voltage which is equal to the offset voltage in numerical value and opposite to the offset voltage in direction can be generated to offset the offset voltage. 本发明提供了一种差分放大电路、误差放大电路及其修调方法，所述差分放大电路包括第一差分对