A/D converter, solid-state image pickup device and driving method of the same, and electronic apparatus

摘要

The present technology relates to an A/D converter, a solid-state image pickup device and a method of driving the same, and an electronic apparatus which are capable of reducing power consumption while reducing a circuit size. A comparator compares a reference voltage with an input voltage, the reference voltage having a ramp waveform whose voltage value varies with time, a lower-bit storage element holds a count value in a predetermined count pattern, based on an output signal from the comparator, a Gray code binary conversion circuit converts the count value in the count pattern held by the lower-bit storage element into binary data, and a storing operation control circuit supplies a pulse signal corresponding to the binary data obtained by conversion in the Gray code binary conversion circuit to a lower-bit U/D CNT. The present technology is applicable to, for example, an image sensor storing a count value in a storage element with use of a Gray code or a phase shift code as a clock signal.

主权项

1. An A/D converter comprising:
a comparison section that compares a reference voltage with an input voltage, the reference voltage having a ramp waveform whose voltage value varies with time; a storage section that holds a count value in a predetermined count pattern, based on an output signal from the comparison section; a conversion section that converts the count value held by the storage section into binary data; and a supply section that supplies a pulse signal corresponding to the binary data obtained by conversion in the conversion section to a first counter, wherein the storage section supplies, to a second counter, a most significant bit signal representing a most significant bit of the count value in the count pattern until the output signal from the comparison section is reversed, and holds lower bits that are lower than the most significant bit of the count value in the count pattern when the output signal from the comparison section is reversed.