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Abstract
Method and device for delaying an electrical signal, the method and device being useable in various signal processing applications. A buried channel (41) is formed by disposing a portion of a layer of piezoelectric semiconductor material (40) between confining layers (50, 30). A surface acoustic wave is established in the piezoelectric semiconductor material via an input transducer (55). Majority carriers are depleted from the channel, and an electrical signal is injected into the channel via an interdigital transducer (55). A delayed version of the electrical signal, which had been carried along by the surface acoustic wave, can then be extracted from the channel via an output diode (71).
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