Patent ID: 7969336

Claim:
A sample-hold circuit comprising: a voltage-current converter, having a first input terminal pair to which an input differential signal is input and a first output terminal pair which outputs current according to the voltage of the input differential signal; a spreading switch having a switch group which switches the first output terminal pair to inverting or non-inverting states; and an integrator having a second input terminal pair coupled to the first output terminal pair via the spreading switch, an output amplifier which outputs to a second output terminal pair an output differential signal amplified according to the differential signal at the second input terminal pair, a capacitor pair which is provided respectively between the second input terminal pair and second output terminal pair, and which is charged or discharged by current input to the second input terminal pair, and a reset circuit which resets charge states of the capacitor pair, wherein the spreading switch is capable of switching to a cutoff state in addition to the inverting and non-inverting states, the spreading switch enters the non-inverting state or inverting state during sampling intervals and the capacitor pair of the integrator is charged or discharged respectively by the input current, the spreading switch enters the cutoff state during a hold interval after the sampling interval, and the output differential signal at the second output terminal pair is held by the integrator, and upon a transition from the hold interval to a sampling interval the reset circuit resets the charge state of the capacitor pair.