Filter circuit and receiving device

摘要

To implement a filter circuit with low noise and a low cutoff frequency in a smaller area, a filter circuit has a first circuit which receives an input signal supplied to an input terminal, amplifies the signal, and outputs the amplified signal to an output terminal, a first differential amplification circuit for receiving the output signal of the first circuit through a first capacitance element, a first resistance element for forming a negative feedback path between the input and output of the first differential amplification circuit, and a second resistance element for forming a negative feedback path between the output of the first differential amplification circuit and the input of the first circuit.

主权项

1. A filter circuit comprising:
a first circuit which receives a signal supplied to an input terminal, amplifies an input signal, and outputs an amplified signal to an output terminal; and a second circuit which receives the signal output to the output terminal and is feedback-coupled to the input of the first circuit, wherein the second circuit includes: a first capacitance element; a first differential amplification circuit for receiving the signal output to the output terminal through the first capacitance element; a first resistance element for forming a negative feedback path between the input and output of the first differential amplification circuit; and a second resistance element for forming a negative feedback path between the output of the first differential amplification circuit and the input of the first circuit.