Phase and amplitude programmable internal mixing SAW signal proc

Details Phase and amplitude programmable internal mixing SAW signal proc Phase and amplitude programmable internal mixing SAW signal proc

1978-12-07

1980-06-10

Smith, Alfred E.

Wave transmission lines and networks

Coupling networks

Delay lines including elastic surface wave propagation means

333166, 333196, 357 26, 364821, H03H 78, H03H 926, H03H 930, H01L 2720

Patent

active

042075467

ABSTRACT:
A SAW signal processor includes a plurality of FET taps having individually programmable source-drain bias which controls both the amplitude and the phase of the mixing efficiency of internal product mixing of waves passing beneath the tap, in dependence upon the amplitude and polarity of the bias, the gates of the FETs may be interconnected so as to provide a summation of correlation at the output. Embodiments include multi-FET taps formed on substrates that are both semiconductive and piezoelectric, such as n-type epitaxial gallium aresenide, and ZnO coated silicon. Simple biphase and weighted biphase of phase-shifted tap pairs, for complete phase control, are disclosed.

REFERENCES:
patent: 3903406 (1975-09-01), London
patent: 4065736 (1977-12-01), London
patent: 4129798 (1978-12-01), Defranould

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