Pulse or digital communications – Repeaters – Testing
Patent
1994-01-19
1994-10-04
Cain, David C.
Pulse or digital communications
Repeaters
Testing
310313D, 333153, 333195, H01L 4104
Patent
active
053533046
ABSTRACT:
In a surface acoustic wave device, there are arranged a piezoelectric substrate, an input electrode and an output electrode. The input electrode is formed on the substrate, and generates a surface acoustic wave propagated in a predetermined direction, in accordance with an input signal. The output electrode is also formed on the substrate, and converts the surface acoustic wave to an electric signal. One of the input and output electrodes includes a plurality of taps equidistantly arranged in a propagation direction of the surface acoustic wave. The other one of the input and output electrodes may comprise a pair of taps arranged at a predetermined distance in the propagation direction. The electrode including a plurality of taps or the electrode including a pair of taps satifies a predetermined relation established among a length between the taps, a transmission speed of the input signal, a propagation velocity of the surface acoustic wave and so forth. According to such a structure, two bits of the signal can be processed without a delay circuit. A demodulating device and a communication system respectively include the surface acoustic wave device so that a circuit structure can be simplified and that data can be reproduced with a high signal quality.
REFERENCES:
patent: 4035675 (1977-07-01), Malocha et al.
patent: 4114116 (1978-09-01), Reeder
patent: 4234930 (1980-11-01), Campbell
patent: 4434481 (1984-02-01), Toda et al.
patent: 4504759 (1985-03-01), Schofield
patent: 4659955 (1987-04-01), Schofield
patent: 4697115 (1987-09-01), Mitsutsuka
patent: 5164628 (1992-11-01), Egara et al.
patent: 5200663 (1993-04-01), Mochizuki et al.
"Acoustic-Surface-Wave Analogue-Digital Converter"; by G. Baldwin et al.; Electronics Letters; vol. 10, No. 11, May 30, 1974, Enage, Great Britain; pp. 225-227.
Cain David C.
Canon Kabushiki Kaisha
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