Patent ID: 8860473
Filing Date: 2014-10-14
Classification: H03K,H04L

Abstract:
1. A ringing suppression circuit for a communication circuit that is connected to a transmission line having a pair of high and low potential side signal lines to perform communication by transmitting a differential signal through the transmission line, the ringing suppression circuit comprising: a high potential side switching element connected between a predetermined high potential reference point and the high potential side signal line; a low potential side switching element connected between a predetermined low potential reference point and the low potential side signal line; and a ringing suppression section configured to turn on the high potential side switching element based on a difference between a potential of the high potential side signal line and a potential applied to a control terminal of the high potential side switching element, the ringing suppression section configured to turn on the low potential side switching element based on a difference between a potential of the low potential side signal line and a potential applied to a control terminal of the low potential side switching element, wherein the ringing suppression section includes a first potential adjuster circuit and a second potential adjuster circuit, the first potential adjuster circuit is connected between the control terminal of the high potential side switching element and one of the high potential side signal line and the low potential side signal line to adjust the potential applied to the control terminal of the high potential side switching element, the second potential adjuster circuit is connected between the control terminal of the low potential side switching element and the other of the high potential side signal line and the low potential side signal line to adjust the potential applied to the control terminal of the low potential side switching element, the first potential adjuster circuit outputs a first voltage to the control terminal of the high potential side switching element by adding the potential of the low potential side signal line and a first predetermined voltage, and the second potential adjuster circuit outputs a second voltage to the control terminal of the low potential side switching element by subtracting the potential of the high potential side signal line from a second predetermined voltage.