Patent ID: 7173485
Filing Date: 2007-02-06
Classification: H03F,H03H,H03M

Abstract:
1. A filter circuit, comprising: a plurality of integrator stages, each stage including a voltage-to-current converter to convert an input voltage into a current supplied to an output thereof and a capacitor coupled to the output of the voltage-to-current converter, a voltage charged in the capacitor being supplied to a next stage as an output of each stage; a capacitor serving as a feed-forward coupling that couples the output of at least one stage of said plurality of integrator stages to a last output node; and a voltage-to-current converter having an input thereof coupled to the output of a last stage of said plurality of integrator stages and an output thereof coupled to said last output node, wherein the voltage-to-current converter having the output thereof coupled to the last output node is a resistor.