公开(公告)号：DE2531783A1

公开(公告)日：1976-02-19

申请号：DE2531783

申请日：1975-07-16

Applicant: IBM

Inventor： COZZO JOSEPH ,  GARROD DAVID K ,  KAZYAKA THOMAS G ,  MELCHER ROBERT L ,  SHIREN NORMAN S

IPC: G11C11/42 ,  G11C13/04 ,  H01L41/00 ,  H03K3/45 ,  H01L31/00 ,  G11C11/34

Abstract: Piezoelectric photosensitive semiconductor crystals or semi-insulators are employed either to store or to process high frequency signals. Storage is accomplished in the crystal by a stable pattern of trapped electrons produced by the interference between two radio-frequency input signal pulses. The latter are applied successively to the crystal, after an initial illumination, causing ultrasonic waves to be generated. The ultrasonic wave of the first pulse, together with the electric field of the second, cause the trapped electrons to be redistributed in a pattern which has the same spatial variation as the ultrasonic wave. In effect, the information contained in the original pulse is stored in the crystal, the latter serving as a recording medium operating over the whole radio frequency range.