Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Patent
1993-03-04
1994-12-06
Callahan, Timothy P.
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
333166, 327361, H03H 1500
Patent
active
053714709
ABSTRACT:
A transverse filler for use in a CCD camera eliminates KTC noise even at very fast pixel rates with relatively relaxed constraints on component accuracy and timing control, The circuit includes summation, divider and subtraction circuits which add the plural outputs of a tapped delay line to which a video signal is applied and generate average KTC noise and KTC noise plus signal representations. The output of the circuits is applied to the input of an capacitor and the output of the capacitor is connected to an electronic switch and to a Sample-and-Hold amplifier. The capacitor is operative to subtract the average KTC noise from the average KTC plus Video signal, The circuit is able to run on-board binning and does not have pixel feedthrough problems.
REFERENCES:
patent: 3573623 (1971-04-01), Bannon
patent: 3614673 (1971-10-01), Kang
patent: 3987293 (1976-10-01), Crooke et al.
patent: 4039978 (1977-08-01), Heller
patent: 4120035 (1978-10-01), Cases et al.
patent: 4417317 (1983-11-01), White et al.
patent: 4724395 (1988-02-01), Freeman
Callahan Timothy P.
Le Dinh
Photometrics Ltd.
Shapiro Herbert M.
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