Patent ID: 6856190

Claim:
A leak current compensating device comprising: a first power source terminal; a second power source terminal having a lower potential than said first power source terminal; an output terminal; a first transistor which is connected at one end to said first power source terminal and which has a conductive state, in which the first transistor outputs a predetermined voltage or current from the other end to said output terminal, and a cut-off state; a second transistor of the same kind as said first transistor which is connected at one end to said first power source terminal and set in the cut-off state; a third transistor which is interposed at a path for the flow of a leak current output from the other end of said second transistor to said second power source terminal, and a control terminal of which is connected to said path; and a fourth transistor which constitutes a current mirror circuit with said third transistor and has a drive capacity to pass a current corresponding to the current flowing through said third transistor from said output terminal to said second power source terminal.