Patent ID: 6271720
Filing Date: 2001-08-07
Classification: H03H

Abstract:
An electrical filter circuit operative to provide a notch frequency response comprising:an operational filter circuit having an input terminal, a first output terminal for providing a first frequency response, a second output terminal for providing a second frequency response, and an operational amplifier having an input coupled to said input terminal and an output coupled to said first output terminal and to said second output terminal;a first resistor coupled between said first output terminal and said input terminal;a second resistor coupled between said input terminal and said second output terminal;a third resistor coupled between an input signal source and said input terminal;a summing circuit having a summing circuit input terminal, a summing circuit output terminal, and an operational amplifier having an input coupled to said summing circuit input terminal and an output coupled to said summing circuit output terminal;a capacitor coupled between said second output terminal and said summing circuit input terminal; anda fourth resistor coupled between said first output terminal and said summing circuit input terminal; wherein:said summing circuit output terminal provides a notch frequency response.