Anti-aliasing pre-filter circuit for semiconductor charge transf

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

1976-09-07

1977-11-01

Miller, Jr., Stanley D.

Electrical transmission or interconnection systems

Personnel safety or limit control features

Interlock

307295, 333 70T, 357 24, H03K 3353, H03H 710, H01L 2978

Patent

active

040567370

ABSTRACT:
An on-chip semiconductor pre-filter device is designed with a prescribed low frequency passband (0 to f) and a prescribed stopband (F.+-.f), 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.

REFERENCES:
patent: 3819958 (1974-06-01), Gosney
patent: 4005377 (1977-01-01), Engeler
"Parallel Realizations of Digital Interpolation Filters for Increasing Sampling Rate", by Urkowitz in IEEE Transactions, Circuits and Systems, vol. CAS-22 (Feb. 1975), pp. 146-154.
"A Computer Program for Designing Optimum Fir Linear Phase Digital Filters", by McClellen et al., IEEE Trans. on Audio and Electroacoustics, vol. AU-21, No. 6, pp. 506-526 (Dec. 1973).
"Transversal Filtering Using Charge-Transfer Devices", by Buss et al., IEEE Journal of Solid State Circuits, (Apr. 1973), pp. 138-146.

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