Patent ID: 8736360

Claim:
An automatic output conductance adjusting circuit for automatically adjusting the output conductance of a differential current output type circuit including a variable negative resistor connected between differential output lines thereof, the automatic output conductance adjusting circuit comprising: a replica of said differential current output type circuit, the replica being supplied a DC value as an input signal; a variable negative resistor connected between differential output lines of said replica; a detector for detecting a DC potential difference between the differential output lines of said replica; and a controller for controlling a conductance of said variable negative resistor connected between the differential output lines of said differential current output type circuit, and a conductance of said variable negative resistor connected between the differential output lines of said replica, based on the DC potential difference detected by said detector, wherein the output of the detector is input to the controller and the controller compares an input value of the input signal and a reference value held in the controller and generates a control signal by taking into account of both a present comparison result and a comparison result of one clock pulse ahead.