Patent ID: 6803812
Filing Date: 2004-10-12
Classification: H03H

Abstract:
An active filter comprising a first voltage dividing circuit, a second voltage dividing circuit, a third voltage dividing circuit, a first capacitor, a second capacitor, a charge/discharge resistor and an operational amplifier, an output terminal of the operational amplifier being connected to an inverting input terminal thereof through the second voltage dividing circuit and the charge/discharge resistor, the first capacitor being connected between the first voltage dividing circuit and the second voltage dividing circuit, the second capacitor being connected between the first voltage dividing circuit and the inverting input terminal of the operational amplifier, the third voltage dividing circuit being connected to a non-inverting input terminal of the operational amplifier, a signal input terminal being connected to the first and the third voltage dividing circuits, and the output terminal of the operational amplifier comprising a signal output terminal of the filter.