System and method for current sensing

The method and system for fixed current sensing are substantially offered over a device, temperature, and process change. This circuit sensing system and method are constituted so that the current by which the known ratio was reduced to the load current by which sensing should be carried out may be supplied. Including the 1st switch with which the illustration circuit sensing system was combined with one or more variable resistor elements, a resistive element is constituted so that the voltage of the 1st switch may be reduced, and this reduced voltage is supplied to the input of an amplifier. Are combined with a resistive element and the 2nd switch, and this amplifier is constituted so that sensing of the voltage on which the 1st switch was reduced may be carried out, Voltage of the 2nd switch is made equal to the voltage on which the 1st switch was reduced, and the current of a known ratio to load current may be supplied in the output of an amplifier. [Selection figure] Fig. 3