1. A/d converter circuit

2. Encoder circuit and a/d converter circuit

3. A/d converter circuit and solid-state image pickup device

4. Successive approximation a/d converter circuit and semiconductor integrated circuit

5. Chopper-type voltage comparator circuit and sequential-comparison-type a/d converter circuit

6. Successive approximation type a/d converter circuit and semiconductor integrated circuit for control

7. A semiconductor circuit including: an A/D converter circuit which converts an inputted first signal into a second signal.

8. Provided are an A/D converter circuit and a method, such that unstable operation due to the discontinuity of DC transfer characteristics is prevented.

9. A signal from a photodiode (PD) is supplied to an A/D converter circuit (30) through an integrator (10) and a switch circuit (20).