Logic controlled charge transfer device transversal filter emplo

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

1976-04-12

1977-08-02

Smith, Alfred E.

Wave transmission lines and networks

Automatically controlled systems

With control of equalizer and/or delay network

307221D, 328167, H03H 728, G11C 1140, H03K 2502, H03H 714

Patent

active

040399788

ABSTRACT:
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/2.sup.n 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 Q1/2.sup.n, Q2/2.sup.n, Q3/2.sup.n. . . Qk/2.sup.n in a last register. The charge packets in the parallel registers represent the time sampled analog input signal divided by 1, 2, 4, 8, . . . 2.sup.n 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.

REFERENCES:
patent: 3054073 (1962-09-01), Powers
patent: 3292110 (1966-12-01), Becker et al.
patent: 3819958 (1974-06-01), Gosney
patent: 3935439 (1976-01-01), Buss et al.

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