Miscellaneous active electrical nonlinear devices – circuits – and – Specific signal discriminating without subsequent control – By amplitude
Patent
1996-12-11
1998-09-01
Ton, My-Trang Nu
Miscellaneous active electrical nonlinear devices, circuits, and
Specific signal discriminating without subsequent control
By amplitude
327 96, G11C 2702
Patent
active
058015558
ABSTRACT:
There is provided a correlative double sampling (CDS) device which can effectively and efficiently remove noise from video signal. The CDS device includes at least two sample-and-hold circuits for sampling a video signal output from an image sensor and outputting a predetermined DC level signal, and a differential amplifier. The correlative double sampling device also includes a clamping circuit for DC-clamping a video signal output from the image sensor and applying the DC-clamped signal to the sample-and-hold circuits. At least two re-sample-and-hold circuits are provided for re-sampling the signal output from the sample-and-hold circuits. A level correcting portion is used for correcting the output level of one of the sample-and-hold circuits and one of the re-sample-and-hold circuits, and outputting a signal whose phase is synchronized with the output of the re-sample-and-hold circuits. Sampling noise is removed by alternately passing the output signals of the re-sample-and-hold circuits and the level correcting portion according to a predetermined signal.
REFERENCES:
patent: 5221963 (1993-06-01), Hashimoto et al.
patent: 5299032 (1994-03-01), Kurita
patent: 5309183 (1994-05-01), Sasaki et al.
patent: 5374953 (1994-12-01), Sasaki et al.
patent: 5406329 (1995-04-01), Kashimura et al.
Nu Ton My-Trang
Samsung Electronics Co,. Ltd.
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