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TCD2703D Datasheet(PDF) 5 Page - Toshiba Semiconductor |
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TCD2703D Datasheet(HTML) 5 Page - Toshiba Semiconductor |
5 / 13 page TCD2703D 2002-11-14 5 Note 10: Random noise is defined as the standard deviation (sigma) of the output level difference between two adjacent effective pixels under no illumination (i.e. dark condition) calculated by the following procedure. (1) Two adjacent pixels (pixel n and n + 1) in one reading are fixed as measurement points. (2) Each of the output levels at video output periods averaged over 200 nanosecond period to get Vn and Vn + 1. (3) Vn + 1 is subtracted from Vn to get DV. DV = Vn - Vn + 1 (4) The standard deviation of DV is calculated after procedure (2) and (3) are repeated 30 times (30 readings). å = | D | = D 30 1 i Vi 30 1 V å = D D = s | | 30 1 i 2 ) V V ( 30 1 i - (5) Procedure (2), (3) and (4) are repeated 10 times to get 10 sigma values. å = s = s 10 1 j j 10 1 (6) I value calculated using the above procedure is observed 2 times larger than that measured relative to the ground level. So we specify the random noise as follows. s = 2 1 noise Random Video output Video output 200 ns 200 ns Pixel n Pixel n + 1 DV Output waveform (effective pixels under dark condition) |
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