Logic controlled charge transfer device transversal filter...

Details Logic controlled charge transfer device transversal filter... Logic controlled charge transfer device transversal filter...

G - Physics

11

C

328/0.4

G11C 11/40 (2006.01) H03H 15/02 (2006.01)

Patent

CA 1097811

A LOGIC CONTROLLED CHARGE TRANSFER DEVICE TRANSVERSAL FILTER EMPLOYING SIMPLE WEIGHTING ABSTRACT OF THE DISCLOSURE A transversal filter structure employing charge transfer techniques which are embodied in charge-coupled-devices although bucket brigade devices may also be used. In the structure an input analog signal is time sampled and for each sample a sequence of charge packets Q/2, Q/4, Q/8...Q/2n is generated. Each sequence of charge packets is entered into a serial charge- coupled-device register and each separate charge packet is then entered into a plurality of n parallel charge-coupled-device registers according to the fractional distribution, i.e. Q1/2, Q2/2, Q3/2...Qk/2 in one register, Q1/4, Q2/4, Q3/4...Qk/4 in another register, up to Q1/2n, Q2/2n, Q3/2n...Qk/2n in a last register. The charge packets in the parallel registers represent the time sampled analog input signal divided by 1, 2, 4, 8,...2n respectively, and tap weights of +1, -1 and 0 are applied by means of logic control and FET switches. The tap weights are bussed together, summed and differenced and the difference signal is the filter output signal.

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