The driver circuit which decreases the influence of disturbance to duty cycle of the digital signal on the bus line

摘要

The driver circuit in order to drive the change to the digital signal of the electric potential which the digital communication line (14) possesses the output terminal which is connected, in the digital communication line and the change from digital signal level (12) it is the electronic circuit which is included. Aforementioned driver circuit (12), while changing to digital level and while changing from digital level, gradually increases selects the drive strength and gradually is decreased the drive strength which respectively generates the selecting signal which the control circuit which (120) with, to receive the aforementioned selecting signal are connected to the aforementioned control circuit in order is connected to electric current control input and the aforementioned digital communication line which possesses the current supply source output terminal which the controllable current-supply circuit which (122,124) with, are connected to the aforementioned digital communication line is connected to the input terminal and the aforementioned control circuit which the digital communication line, possesses the output terminal which in the electric potential the required rangeAs detected, whether or not it arrived, the detector which is formed (126) with it has. The aforementioned control circuit (120), when the aforementioned detector showing the fact that the aforementioned electric potential reaches to the required range while changing to the aforementioned digital level, you remember information, concerning the drive strength which is selected in order drive strength to reset to the drive strength which is remembered lastly when changing from the aforementioned digital level as a 1st step, you are constituted.