Recursive filter using charge transfer devices

Details Recursive filter using charge transfer devices Recursive filter using charge transfer devices

H - Electricity

03

H

328/0.4

H03H 17/04 (2006.01) H03H 15/00 (2006.01) H03H 15/02 (2006.01)

Patent

CA 1141465

RECURSIVE FILTER USING CHARGE TRANSFER DEVICES ABSTRACT OF THE DISCLOSURE A CTD recursive filter including, within a single channel, two side-by-side CTD delay lines wherein charges are respectively transferred in opposite directions. Each split electrode of the first CTD delay line constitutes a pair with a corresponding split electrode of the second delay line, each even pair of split electrodes being separated from the next odd pair of split electrodes by an even bridge electrode occupying the entire width of -the channel, and each odd pair of split electrodes being separated from the next even pair of electrodes by an odd bridge electrode also occupying the entire width of the channel. A split electrode of the first delay line in an even pair and the split electrode of the second delay line in the next odd pair have lengths the sum of which is a constant, when the even pair is separated from the concerned odd pair by an even bridge electrode. A split electrode of the first delay line in an odd pair and the split electrode of the second delay line in the next even pair have lengths the sum of which is equal to the constant, when the odd pair is separated from the even pair by an odd bridge electrode. At each odd clock pulse, the odd bridge electrode charges are distributed to the closer even bridge electrodes in accordance with the length of the split electrode of the first delay line in the close even pair and the length of the split electrode of the second delay line in the close odd pair, and, at each even clock pulse, the even bridge electrode charges are distributed to the closer odd bridge electrodes in accordance with the length of the split electrode of the first delay line in the close odd pair and the length of the split electrode of the second delay line in the close even pair. Each delay line is connected from an input for the signal to be filtered and to an output for the filtered signal.

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