Patent ID: 7589549
Filing Date: 2009-09-15
Classification: G01R

Abstract:
1. A driver circuit that has a first operational mode and a second operational mode and outputs an output signal according to an input signal, comprising: a first driver section that, in the first operational mode, generates and outputs the output signal according to the input signal and, in the second operational mode, outputs a power supply power having a predetermined voltage; and a second driver section that, in the first operational mode, receives the output signal output by the first driver section and outputs the received signal to the outside and, in the second operational mode, generates the output signal according to the input signal and outputs the thus generated signal to the outside, wherein the second driver section includes, a first transistor that, in the second operational mode, generates the output signal by operating according to the input signal and receives the power supply power from the first driver section; and a second transistor that, in the second operational mode, operates differentially with respect to the first transistor and receives the power supply power from the first driver section commonly with the first transistor.