Anti-aliasing pre-filter circuit for semiconductor charge...

Details Anti-aliasing pre-filter circuit for semiconductor charge... Anti-aliasing pre-filter circuit for semiconductor charge...

G - Physics

11

C

352/82.2

G11C 11/08 (2006.01) G11C 11/34 (2006.01) G11C 19/28 (2006.01) H01L 21/70 (2006.01) H01L 29/768 (2006.01) H03H 15/02 (2006.01)

Patent

CA 1107396

ANTI-ALIASING PRE-FILTER CIRCUIT FOR SEMICONDUCTOR CHARGE TRANSFER DEVICE Abstract of the Disclosure An on-chip semiconductor pre-filter device is designed with a prescribed low frequency passband (0 to f) and a prescribed stopband, with a frequency roll-off therebetween. The pre-filter performs a weighted averaging of signal samples taken from an input electrical signal at a suitable sampling frequency and converts the weighted average into an equivalent charge packet for input by injection into a semiconductor charge coupled device (CCD) driven on the same chip by a clock of frequency F. In this way, the "reflected" parts (in band: F+f) of the frequency spectrum of the CCD are suppressed from the input to the CCD, thereby suppressing undesired aliasing in the CCD.

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