Patent ID: 7696810

Claim:
A reference current source circuit for performing fuse trimming, comprising: a current source circuit; a trimming fuse; a switching circuit for connecting the current source circuit to the trimming fuse upon receipt of an inputted signal at a predetermined level, and disconnecting the current source circuit from the trimming fuse upon receipt of the inputted signal at a different level from the predetermined level; a control circuit including a plurality of input terminals, for controlling the operation of the switching circuit by generating a signal at the predetermined level or the different level from the predetermined level in accordance with a test control signal inputted into the plurality of input terminals and inputting the generated signal into the switching circuit; and a resistive element connecting at least one of the plurality of input terminals of the control circuit to a positive current source terminal or a negative current source terminal, the control circuit controlling the operation of the switching circuit by generating the signal at the predetermined level in accordance with a signal of the input terminal connected to the resistive element.