Patent ID: 6943619
Filing Date: 2005-09-13
Classification: H03H

Abstract:
1. An electrical signal filter circuit, comprising: an input signal line; an output signal line; a first resistor operatively connected to the input signal line; a first node operatively connected to the first resistor such that the first resistor is operatively connected between the input signal line and the first node; a capacitor multiplier circuit operatively connected to the first node, wherein the capacitor multiplier circuit comprises at least one amplifier circuit and at least one capacitor, wherein the at least one amplifier circuit comprises a negative input, a positive input and an output, wherein the first node is operatively connected to the positive input of the at least one amplifier circuit of the capacitor multiplier circuit, and wherein the capacitor multiplier circuit increases a capacitance of the output signal line; a second resistor operatively connected to the output signal line; a second node operatively connected to the second resistor such that the second resistor is operatively connected between the output signal line and the second node and wherein the second node is also operatively connected to the negative input and the output of the at least one amplifier circuit; and an on-off switch operatively connected to capacitor and selectively connected to the first node.