Patent ID: 7123080
Filing Date: 2006-10-17
Classification: H03F

Abstract:
1. An input circuit, comprising: a first input terminal to which a first input signal is inputted; a second input terminal to which a second input signal is inputted; an output terminal from which an output signal acquired by performing differential amplification between the first input signal and the second input signal is outputted; a differential amplification circuit which converts a differential signal into a single end signal to output the single end signal; an attenuation circuit which attenuates the first input signal to output the attenuated signal to the differential amplification circuit; a capacitor in which one end thereof is connected to the first input terminal, and another end thereof is connected to an output side of the differential amplification circuit; a buffer to which the single end signal outputted from the differential amplification circuit and a signal transmitted through the capacitor are inputted, and which outputs the output signal; and a feedback circuit which outputs a signal based on the output signal outputted from the buffer and the second input signal to the differential amplification circuit.