Surface acoustical wave charge transfer device having a pluralit

Details Surface acoustical wave charge transfer device having a pluralit Surface acoustical wave charge transfer device having a pluralit

1986-06-30

1989-01-17

Munson, Gene M.

Electrical pulse counters, pulse dividers, or shift registers: c

Charge transfer device

Compensating for or preventing signal charge deterioration

357 24, 357 30, G11C 1928, H01L 2978, H01L 2714, H01L 3100

Patent

active

047992441

ABSTRACT:
A surface acoustic wave charge transfer device of monolithic type has a channel stopper for preventing the charge carriers from deviating from the transfer channel of the device. The charge transfer device has an acoustic wave generator for generating an acoustic wave propagating in a piezo-electric layer, a transfer channel for transferring charge carriers within a depletion layer in the vicinity of the surface of a semiconductor being bunched in a potential wells of a potential wave accompanying the acoustic wave, and a detector for detecting the transferred charge carriers. In a preferred embodiment of the invention, the charge carriers are transferred in a perfect bunching condition. In another preferred embodiment, the acoustic wave propagates at such a speed that the time for propagating one wavelength distance is shorter than the statistical time for the charge carriers to drop in the traps on the surface of the semiconductor. In a further preferred embodiment, the charge transfer device has a carrier storing portion in or close to the transfer channel for storing charge carriers for memorization.

REFERENCES:
patent: 3858232 (1974-12-01), Boyle et al.
patent: 3975753 (1976-08-01), Bharat
patent: 3992716 (1976-11-01), DiStefano
White, "Acoustic Surface-Wave Fields to Move Carriers in a Charge-Coupled Device", IBM Tech. Disclosure Bulletin, vol. 18 (10/75), pp. 1613-1614.
Gaalema et al, "Acoustic Surface Wave Interaction Charge-Coupled Device", Applied Physics Letters, vol. 29 (7/76), pp. 82-83.
Sequin et al, Charge Transfer Devices, Academic Press, N.Y. (1975), pp. 42-44, additional pp. 152-157.

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