CTD Transversal filter with parallel inputs

Details CTD Transversal filter with parallel inputs CTD Transversal filter with parallel inputs

1979-09-10

1980-12-30

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

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

307221D, 333166, 357 24, H03H 1502, H03H 1706, H03H 17284, G11C 1928

Patent

active

042426545

ABSTRACT:
A CTD transversal filter is disclosed which comprises a CTD arrangement with parallel inputs and evaluation circuits. The evaluation coefficients are set up in digital fashion by means of comparator-controlled input sequences of signal-dependent quantities of charge. High value coefficients may be established without the need to reduce a lower frequency transmission limit. With the invention, the transfer electrodes of the CTD are not supplied with the normal clock voltages but with the output voltages of a shift register in which circulates an item of logic information which forwards the input charges individually and consecutively by one electrode spacing. The application of this "electrode-per-bit" operation results in a considerable increase in the times for the individual input sequences. The invention is useful in programmable frequency filters.

REFERENCES:
patent: 4035628 (1977-07-01), Lampe et al.
patent: 4080581 (1978-03-01), Sakaue et al.
patent: 4163957 (1979-08-01), Knauer et al.
patent: 4188597 (1980-02-01), Knauer
Knauer et al.-"CCD Transversal Filters with Parallel-In/Serial-Out Configuration", Siemans Research and Development Report, vol. 7, 1978, No. 3, pp. 138-142.

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