Patent ID: 8427222

Claim:
A current driving circuit, comprising: a first constant current source circuit that delivers a first driving current to a load; and an output voltage difference amplifier circuit that detects a voltage change produced at a load driving end during a preset time period and that delivers a current or a voltage corresponding to said voltage change to said load during a time period different from said preset time period, wherein, during a first time period, a capacitance circuit compares the potential during a directly preceding time period to that during the current time period, and causes a potential at the load driving end during the current time period to be stored in any of fifth and sixth capacitance elements depending on a result of comparison, and wherein said output voltage difference amplifier circuit buffers an average value of the potential values stored in said fifth and sixth capacitance elements during a second time period following said first time period, followed by delivering said average value to said load.