Transversal filter

Details Transversal filter Transversal filter

1979-03-12

1980-11-11

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

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

307221D, 333166, 357 24, H03H 728, H03K 5156, G11C 1928

Patent

active

042335787

ABSTRACT:
A transversal filter utilizes a charge transfer device (CTD) shift register having parallel inputs and evaluation circuits assigned to those inputs. The evaluation circuits which form evaluation coefficients by reading-in signal-dependent amounts of charges. The charges are summed in the shift register and the charges successively reaching the output level are read out in series in order to form the filtered output signal. An electric coefficient setting is provided which guarantees a large relative adjustment range having a small requirement for semiconductor surface. The evaluation circuits have separately actuated source zones or additional source zones which are arranged in pairs on opposite sides of the CTD transfer channel, or which are provided with gate oxide and field oxide areas arranged beneath a transfer gate between the evaluation circuits and the shift register. A transversal filter constructed according to the invention is suitable for use as an electrically programmable frequency filter.

REFERENCES:
patent: 4056737 (1977-11-01), Sequin
patent: 4080581 (1978-03-01), Sakaue et al.
patent: 4163957 (1979-08-01), Knauer et al.
Knauer et al.-"Parallel-In/Serial-Out: A New Approach for Transversal Filters", Electronics Letters, vol. 13, No. 5, Mar. 3, 1977, pp. 126-127.
Sequin et al., "Charge Transfer Devices", Academic Press, Inc. New York, San Francisco, London, 1975, pp. 1-18, 48-50.
Sakaue et al.-"An Input-Weighted CCD Transversal Filter", Japanese Journal of Applied Physics, vol. 16 (1977) Supplement 16-1, pp. 391-396, 387-390.

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