Input-weighted charge transfer transversal filter

Details Input-weighted charge transfer transversal filter Input-weighted charge transfer transversal filter

1979-08-03

1981-02-03

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, G11C 2702, H03K 17693

Patent

active

042491452

ABSTRACT:
An input-weighted charge transfer transversal filter which comprises a charge transfer device including a plurality of stages, a plurality of signal charge injectors to inject into the stages of the charge transfer device weighted signal charge packets containing an AC component and a DC component, and a sense amplifier to sense the output signal of the transversal filter from the final stage of the charge transfer device, a DC charge injector to inject a predetermined quantity of DC charge into the first stage of the charge transfer device, and charge drains respectively coupled to the stages of the charge transfer device to drain at least DC charge from stages. Due to this arrangement the quantity of DC component injected by the signal charge injectors and transferred through the charge transfer device will be reduced. This leads to an improvement in packing density and signal detecting capability of the transversal filter. According to a first embodiment of this invention, positive weighting of a signal is achieved by injecting a weighted signal charge packet into the stage of the charge transfer device, while negative weighting is achieved by draining the weighted signal charge packet from the stage. According to a second embodiment, selection between positive and negative weighting depends on the polarity of an input signal applied to the signal charge injector.

REFERENCES:
patent: 3819954 (1974-06-01), Butler et al.
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
Sakaue et al.-"An Input Weighted CCD Transversal Filter" (Reprint) Japanese Journal of Applied Physics, vol. 16 (1977) Supplement 16-1; pp. 391-396.

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