Patent ID: 6930544

Claim:
A filter, comprising: a first integrator including a first transconductance circuit, which performs a voltage-current conversion of a difference between a voltage of a filter input terminal and a voltage of a filter output terminal, and a first capacitor; and a second integrator including a second transconductance circuit which performs a voltage-current conversion of a difference between an output voltage of said first integrator and the voltage of said filter output terminal, a third transconductance circuit, which performs a voltage-current conversion of a difference between the voltage of said filter input terminal and the voltage of said filter output terminal, wherein an output current thereof is added to an output current of said second transconductance circuit, and a second capacitor, wherein: said first capacitor is connected between an output terminal of said first transconductance circuit and a ground terminal, said second capacitor is connected between said filter input terminal and an output terminal of said second transconductance circuit, the voltage of said second integrator via said second capacitor, and the output terminal of said second transconductance circuit is an output terminal of said filter.