Wave transmission lines and networks – Automatically controlled systems – With control of equalizer and/or delay network
Patent
1977-05-02
1978-07-04
Smith, Alfred E.
Wave transmission lines and networks
Automatically controlled systems
With control of equalizer and/or delay network
328 14, 331107A, 333 30R, 333 72, H03H 904, H03H 926, H03H 930, H01L 4110
Patent
active
040991482
ABSTRACT:
A frequency synthesizer, for use with a means for generating two sequences of electrical pulses, one sequence having a delay with respect to the other, comprises a surface acoustic wave (SAW) device, adapted to receive one of the sequences of electrical pulses from the generating means. The SAW device comprises a substrate, on the surface of which is disposed a first set of interdigitated electrodes. The electrodes receive the electrical pulses and tranduce them to acoustic waves, which traverse the surface of the substrate. The lengths of the electrodes are configured as a function of m, where m is defined by the relation m = R.sup.n mod P, where P is a prime number, R is a primitive root of P, and 1.ltoreq.n.ltoreq.P-1. A second set of interdigitated electrodes, approximately N-1 in number, is also disposed on the surface of the substrate, the electrodes of the first and second sets being parallel. The second set of electrodes is so disposed as to receive the acoustic waves generated by the first set of electrodes, and transduce them back to electrical signals, which are conducted on a set of leads connected to the electrodes. Means, adapted to receive pulses from the electrical pulse generating means, selectively receives the electrical signals from the second set of electrodes. The receiving means has as an output a signal whose frequency is determined by the order in which the signals are received from the second set of electrodes.
REFERENCES:
patent: 3824586 (1974-07-01), Quate
patent: 3891929 (1975-06-01), Carr et al.
patent: 4024480 (1977-05-01), Reeder et al.
Maines et al. "Surface-Acoustic Wave Devices for Signal Processing Applicons" in Proceedings of The IEEE, vol. 64, No. 5, May 1976, pp. 639-652.
Alsup James M.
Whitehouse Harper J.
Johnston Ervin F.
Nussbaum Marvin
Sciascia Richard S.
Smith Alfred E.
Stan John
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