发明名称 |
CCD Correlated quadruple sampling processor |
摘要 |
A correlated quadruple sampling processor for improved signal-to-noise ratio in the output of a charge-coupled device (CCD) is comprised of: switching means for momentarily clamping a CCD signal line at a first reference level A before a CCD data pulse and then obtaining a first data sample B with respect to the reference A during a CCD data pulse, and storing the positive sample B-A; switching means for momentarily clamping the CCD signal line a second time at the level C during the presence of the CCD data pulse and then obtaining a second data sample D with respect to the reference level C after the CCD data pulse, and storing the negative sample D-C; and means for obtaining the difference between the stored samples +(B-A) and -(D-C), thus increasing the net signal amplitude by a factor of about 2 while the noise would be increased by only a factor of 2ROOT 2 since there will be no correlation in the noise between the double samples +(B-A) and -(D-C) effectively added.
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申请公布号 |
US4262258(A) |
申请公布日期 |
1981.04.14 |
申请号 |
US19790009889 |
申请日期 |
1979.02.06 |
申请人 |
FROSCH, ROBERT A. ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, WITH RESPECT TO AN INVENTION OF;GAALEMA, STEVE D. |
发明人 |
FROSCH, ROBERT A. ADMINISTRATOR OF THE NATIONAL AERONAUTICS AND SPACE ADMINISTRATION, WITH RESPECT TO AN INVENTION OF;GAALEMA, STEVE D. |
分类号 |
G11C19/28;G11C27/02;G11C27/04;H04N5/217;H04N5/378;(IPC1-7):H03K5/00;H03K5/15 |
主分类号 |
G11C19/28 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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