A/D converter with noise cancel function

Details A/D converter with noise cancel function A/D converter with noise cancel function

2006-09-07

2009-10-06

Mai, Lam T (Department: 2819)

Coded data generation or conversion

Analog to or from digital conversion

Analog to digital conversion

C341S155000

Reexamination Certificate

active

07598896

ABSTRACT:
An A/D converter comprises capacitors C1, C2, C3, C4, and C5coupled via a plurality of switches to a differential input/differential output amplifier1. The capacitor C5determines a gain of the amplifier1. A reset level is stored in the capacitor C1, and a signal level is stored in the capacitor C2. One terminal of the capacitor C1and one terminal of the capacitor C2are coupled to the respective differential inputs, and the other terminals of the capacitors C1, C2are coupled to each other, whereby the amplifier1generates a difference signal between the reset level and the signal level. The cyclic A/D conversion of this difference signal is performed by switching the capacitors C1, C2, C3, and C4coupled via a plurality of switches to the differential-input/differential-output amplifier1, thereby obtaining an A/D conversion value with reduced random noise.

REFERENCES:
patent: 5212486 (1993-05-01), Nagaraj
patent: 6128039 (2000-10-01), Chen et al.
patent: 6535157 (2003-03-01), Garrity et al.
patent: 7345615 (2008-03-01), Kawahito
patent: 2001-053610 (2001-02-01), None
patent: 2003-158432 (2003-05-01), None
patent: 2005-136540 (2005-05-01), None
patent: 2006-025189 (2006-01-01), None
Steven Decker et al., “A 256×256 CMOS Imaging Array with Wide Dynamic Range Pixels and Column- Parallel Digital Output,” IEEE J. Solid-State Circuits, vol. 33, No. 12, Dec. 1998 (pp. 2081-2091).
Nobuhiro Kawai and Shoji Kawahito, “Noise Analysis of High-Gain, Low-Noise Column Readout Circuits for CMOS Image Sensors,” IEEE Trans. Electron Devices, vol. 51, No. 2, Feb. 2004 (pp. 185-194).
Mitsuhito Mase, Shoji Kawahito, Masaaki Sasaki and Yasuo Wakamori, “A 19.5b Dynamic Range CMOS Image Sensor with 12b Column-Parallel Cyclic A/D Converters,” 2005 IEEE Int'l Solid-State Circuits Conference, Digest of Technical Papers, Feb. 6, 2005 (pp. 350, 351, 603).
International Search Report for PCT/JP2006/317772, Form PCT/ISA/210, completed Nov. 7, 2006 (1 sheet).
Translation of International Preliminary Report on Patentability for PCT/JP2006/31772, Forms PCT/IB/338, PCT/IB/373 and PCT/ISA/237, issued Mar. 11, 2008 (5 sheets).

Affiliated with

Also associated with

Rating

A/D converter with noise cancel function does not yet have a rating. At this time, there are no reviews or comments for this patent.

If you have personal experience with A/D converter with noise cancel function, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and A/D converter with noise cancel function will most certainly appreciate the feedback.

Rate now

Comments { 0 }

Profile ID: LFUS-PAI-O-4113650