Transversal filter

Details Transversal filter Transversal filter

H - Electricity

03

H

356/30, 328/0.4

H03H 15/02 (2006.01) H01L 29/768 (2006.01)

Patent

CA 1136288

ABSTRACT OF THE DISCLOSURE A transversal filter utilizes a charge transfer device (CTD) shift register having parallel inputs and evaluation circuits assigned to those inputs. The evaluation circuits which form evaluation coefficients by reading-in signal- dependent amounts of charges. The charges are summed in the shift register and the charges successively reaching the output level are read out in series in order to form the filtered output signal. An electric coefficient setting is provided which guarantees a large relative adjustment range having a small requirement for semiconductor surface. The evaluation circuits have separately actuated source zones or additional source zones which are arranged in pairs on opposite sides of the CTD transfer channel, or which are provided with gate oxide and field oxide areas arranged beneath a transfer gate between the evaluation circuits and the shift register. A transversal filter constructed according to the invention is suitable for use as an electrically programmable frequency filter.

324465

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