Accession Number : ADD005399

Title :   Transversal Filter Prime Sequence Frequency Synthesizer.

Descriptive Note : Patent,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON D C

Personal Author(s) : Alsup,James M ; Whitehouse,Harper J

Report Date : 04 Jul 1978

Pagination or Media Count : 8

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(n) mod P, where P is a prime number, R is a primitive root of P, and 1 less tha or equal to n less than or equal to 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. (Author)

Descriptors :   *Patents, *Frequency synthesizers, Surface waves, Acoustic waves

Subject Categories : Line, Surface and Bulk Acoustic Wave Devices
      Acoustics

Distribution Statement : APPROVED FOR PUBLIC RELEASE