Patent ID: 8593202

Claim:
A ringing suppression circuit for suppressing ringing generated in transmission of a differential signal through a transmission line, which is formed of a pair of a high potential side signal line and a low potential side signal line, the ringing suppression circuit comprising: a single inter-line switching element of a voltage driven type connected between the pair of signal lines; and a control section for turning on the inter-line switching element for a fixed period when a change in a level of the differential signal is detected, wherein the control section includes: an inversion circuit for inverting and outputting the level of the differential signal; and a delay circuit that outputs the level of the differential signal after delaying for the fixed period, the inversion circuit and the delay circuit being configured to generate a logical product signal of a signal output from the inversion circuit and a signal output from the delay circuit and output the logical product signal to a control terminal of the inter-line switching element, wherein the inversion circuit includes a first switching element of a voltage driven type having a control terminal connected to one of the pair of signal lines, a potential reference side conductive terminal connected to the other of the pair of signal lines and a non-reference side conductive terminal connected to the inter-line switching element; the delay circuit includes a second switching element of a voltage driven type connected to the first switching element in parallel, an RC filter circuit and a third switching element of a voltage driven type, the third switching element having a potential reference side conductive terminal connected to a potential reference side conductive terminal of the second switching element, a non-reference side conductive terminal connected to a control terminal of the second switching element; and the RC filter circuit is connected between one of the pair of signal lines and the control terminal of the second switching element.