CTD Transversal filter

Details CTD Transversal filter CTD Transversal filter

1982-02-02

1984-04-17

Nussbaum, Marvin L.

Wave transmission lines and networks

Coupling networks

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

333166, H03H 1502

Patent

active

044437749

ABSTRACT:
CTD transversal filter, for time delayed forming of a given input signal being weighted and subsequently summed for producing a filter characteristic, with weighting coefficients optionally having a negative and a positive sign, including a separate input stage for forming each desired weighting coefficient for obtaining a desired filter characteristic, the input signal being scanned by a common scanning frequency for all input stages, being converted to a charge packet proportional to its voltage and being time delayed in the input stages, the input stages for forming the negative weighting coefficients being formed in an inverting manner as compared to the input stages for forming the positive weighting coefficients, gate electrodes of the input stages, the areas of the gate electrodes of the input stages under which the charge packets are formed proportional to the input voltage, corresponding to the ratio of the absolute values of the required weighting coefficients, and a common output stage in which the input stages are combined.

REFERENCES:
patent: 4231002 (1980-10-01), Knauer et al.
patent: 4249145 (1981-02-01), Sakaue et al.
"Charge Transfer Devices", 1975, C. H. Sequin and M. F. Tompsett, Academic Press, pp. 216-227.

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