CCD selective transversal filter

Details CCD selective transversal filter CCD selective transversal filter

1974-10-21

1976-12-21

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

179 15A, 307221D, G11C 1928, H03H 728, H03H 730

Patent

active

039991520

ABSTRACT:
A charge coupled device to provide a multi-channel selective transversal filter in which a plurality (N) of channels are sequentially processed in a common transversal filter unit to provide a desired transfer function such as a high pass filter. The analog signals from a plurality of sources or channels are fed into the selective transversal filter in serial fashion with the signal from each channel being nondestructively sampled and multiplied by appropriate weighting coefficients as provided by split electrodes separated by (N-1) charge coupled device storage bits. By having storage electrodes between the split electrodes equal to the number of input channels, the split electrodes, which provide the output signals, operate upon signal information from one channel at a time. The displacement current differences between the two halves of all of the split electrodes provide output signals having the desired filter characteristics. The transversal filter devices in accordance with the invention may be operated in a single phase clock mode or in other clock modes. The filter may have a tuning capability to modify the filter response by providing a variation of the clock frequency applied to the electrodes.

REFERENCES:
patent: 3758794 (1973-09-01), Kosonocky
patent: 3809923 (1974-05-01), Esser
patent: 3814955 (1974-06-01), Itoh et al.
patent: 3819958 (1974-06-01), Gosney
patent: 3877056 (1975-04-01), Bailey
Smith et al., "Active Bandpass Filtering with Bucket Brigade Delay Lines" in IEEE Journal of Solid-State Circuits, vol. SC-7, No. 5 Oct. 1972; pp. 421-425.

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