Output conductance automatic regulation circuit of differential current output type circuit and filter circuit

Abstract

Output conductance of a differential current output type circuit constituting a filter body (1) and having a variable negative resistor connected between differential output lines is automatically regulated. The output conductance automatic regulation circuit comprises a differential voltage/current conversion circuit (2) which is a replica of a differential voltage/current conversion circuit constituting the filter body (1), a variable negative resistor (3) connected between the differential output lines of the differential voltage/current conversion circuit (2), a detector (4) for detecting the DC potential difference between the differential output lines of the differential voltage/current conversion circuit (2), and a controller (5) for controlling the differential voltage/current conversion circuit (2) and the conductance of a variable negative resistor connected with the differential voltage/current conversion circuit constituting the filter body (1) based on the detection results from the detector (4).

Dependencies are inferred from the claim text.