Patent ID: 6946900

Claim:
A current output circuit in which a current can be adusted through zapping, the circuit comprising: a reference transistor for inducing flow of a reference current for determining a current of a constant current source; an adjustment current transistor for inducing flow of an adjustment current which constitutes at least a portion of the reference current flowing through the reference transistor; a current-determining transistor, which forms a current mirror in combination with the adjustment current transistor, for determining an adjustment current flowing through the adjustment current transistor, the current-determining transistor being diode-connected; and a switching transistor, which is connected in parallel with the current-determining transistor, current flowing through the switching transistor and not through the current-determining transistor when the switching transistor is switched on, and current flowing through the current-determining transistor when the switching transistor is switched off, wherein the switching transistor is set to be on or off through a zapping operation with respect to a zapping terminal, the reference current is adusted by the on/off state of the switching transistor, a reference voltage is applied to the current-determining transistor via a resistor, the reference voltage is generated from a reference power supply, and the reference power supply includes a compensation transistor which is diode-connected, the compensation transistor in the reference power supply is inserted at an intermediate point of voltage divider resistors, and temperature characteristics of the current-determining transistor are compensated by a voltage change of the reference voltage stemming from temperature characteristics of the compensation transistor.