CTD charge subtraction transversal filter

Details CTD charge subtraction transversal filter CTD charge subtraction transversal filter

1976-10-29

1980-03-25

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Frequency or time domain filters and delay lines utilizing...

307221D, 333166, 357 24, H03H 728, G11C 1928, G11C 2702, H01L 2978

Patent

active

041952731

ABSTRACT:
A CTD (charge transfer device) transversal filter that utilizes displacement current charge substraction techniques to create positive displacement current charge summation for some electrodes and negative displacement current charge summation for other electrodes into and out of a common electrode node. The operation is accomplished by shifting by one half bit all signal charges within the negative tap structure with respect to the signal charges within the positive tap structure. Thus, only a single summing capacitance node is utilized with all taps, plus and minus, being connected together, eliminating the differential amplifier requirement of other CTD transversal filters. An arrangement of either zero tap weights with an extra one bit delay or a separate high-frequency pulse eliminating a one bit delay are utilized to provide or not provide, as desired, zero weighting between the tap sections. The arrangements of the invention provide substantially any desired class of impulse response function and in most arrangements, clock pick-up noise is substantially cancelled and capacitive imbalance between positive and negative sections, being common, is eliminated. The invention applies to both analog and digital tap weight designs.

REFERENCES:
patent: 3809923 (1974-05-01), Esser
patent: 3814955 (1974-06-01), Itoh et al.
patent: 3819958 (1974-06-01), Gosney
patent: 3953745 (1976-04-01), Bailey
patent: 3999152 (1976-12-01), Sato et al.
patent: 4005377 (1977-01-01), Engeler
patent: 4099197 (1978-07-01), Ibrahim et al.
patent: 4123733 (1978-10-01), Poirer
Sangster-"The Bucket Brigade Delay Line, a Shift Register for Analogue Signals" in Philips Technical Review, vol. 31, 1970, No. 4, pp. 97-110.
Ibrahim et al.-"CCD'S for Transversal Filter Applications," IEEE, IEDM, Washington, D.C., Dec. 1974, pp. 240-243 and cover page.
Collins et al-"Analog Matched Filters Using Charge Coupled Devices", IEEE NEREM 72 record, Boston, Mass., Oct. 30-Nov. 3, 1972, pp. 155-157, cover page.
Smith et al.-"Active Bandpass Filtering with Bucket-Brigade Delay Lines," IEEE Journal of Solid State Circuits, vol. SC-7, No. 5, Oct. 1972, pp. 421-425.
MacLennan-"Charge Coupled Devices" in Wireless World, Feb. 1975, pp. 61-65.

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