Accession Number : ADD011974

Title :   SAW (Surface Acoustic Wave) Transition Detector for PSK (Phase Shift Keying) Signals.

Descriptive Note : Patent Application,

Corporate Author : DEPARTMENT OF THE ARMY WASHINGTON DC

Personal Author(s) : Skudera,William J , Jr ; Konig,Charles E

Report Date : 01 Nov 1985

Pagination or Media Count : 20

Abstract : This disclosure related to a phase transition detector for PSK signals which utilizes a dual channel SAW differential delay line to achieve a required delay. Each channel or path of the SAW device comprises an input and an output transducer. The two channels provide a predetermined differential delay (T) inasmuch as they are of different lengths. A PSK input signal is deliver to a power splitter, with the output therefrom coupled to the pair of input transducers of the SAW device. The output transducers are coupled to a multiplier which serves to detect phase transitions in the input PSK signal. The multiplier output is coupled to an output terminal via a low pass filter which provides harmonic repression. In another embodiment a SAW device comprises a bank if dual channel differential delay lines with each channel set to a different predetermined delay (T) so that a plurality of PSK signals of different chip rates can be separated out and detected. The PSK input signals are delivered to a power splitter, with the output thereform coupled to a pair of input transducers of the SAW device. Output transducers are spaced predetermined distances from one or the other of said input transducers. Parallel sets of multipliers and low pass filters are coupled to predetermined SAW output transducers. Each multiplier serves to detect the phase transitions in one, and only one, PSK input signal. (Patent applications)

Descriptors :   *PATENT APPLICATIONS, *TRANSDUCERS, *PHASE SHIFT KEYERS, *SURFACE ACOUSTIC WAVE DEVICES, *PHASE DETECTORS, DUAL CHANNEL, INPUT, LOW PASS FILTERS, OUTPUT, DELAY, DETECTORS, PHASE SHIFT, PHASE, CHANNELS, CHIPS(ELECTRONICS), TRANSFORMATIONS, POWER, RATES, SIGNALS, SPLITTING, SURFACE ACOUSTIC WAVE DEVICES, TRANSITIONS

Subject Categories : Non-radio Communications

Distribution Statement : APPROVED FOR PUBLIC RELEASE