Patent ID: 6556078
Filing Date: 2003-04-29
Classification: H03F,H03H

Abstract:
A low-corner frequency high pass filter circuit comprising:an operational amplifier having an inverting input, a non-inverting input and an output; a first resistor connected between the inverting input and a reference voltage; a feedback resistor connected between the inverting input and the output; a series capacitor having a first end connected to the non-inverting input of the operational amplifier and a second end connected to an input signal; and a low gain amplifier, having an input connected to the output of the operational amplifier and having an output connected to the non-inverting input of the operational amplifier, wherein the low gain amplifier includes a first amplifier having a first gain and a second amplifier having a second gain, a first amplifier output being subtracted from a second amplifier output, wherein the first gain is different than the second gain.