Solid-state image pickup device and signal processing method therefor
AssigneeSony Corporation
InventorsHiroki Sato, Keiji Mabuchi, Nobuo Nakamura, Tetsuya Iizuka
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Abstract
The device includes an pixel array part having a plurality of unit pixels, a CDS (correlated double sampling) circuit, and an A/D converter. A pixel signal read from a pixel array part via a signal line is subjected to CDS processing (noise elimination processing) in the CDS circuit, and then this pixel signal is inputted into the A/D converter which performs A/D conversion on the pixel signal. The A/D converter includes a ΔΣ modulator and a digital filter to perform highly accurate A/D conversion. The invention can also be applied to a construction in which an A/D converter is provided at the front stage of the CDS circuit.
Claims15
An electronic apparatus comprising:
- a unit pixel configured to convert a signal charge into a pixel signal, a photoelectric conversion element in the unit pixel being configured to generate said signal charge;
- a CDS circuit configured to perform correlated double sampling on said pixel signal, said correlated double sampling converting said pixel signal into an analog signal;
- a delta sigma (ΔΣ) modulator configured to convert said analog signal into a digital signal, a source voltage for the ΔΣ modulator being an analog side source voltage;
- a digital filter configured to perform filter processing on said digital signal, a source voltage for the digital filter differing from said analog side source voltage.
Dependencies are inferred from the claim text.