Surface acoustical wave charge transfer device having a plurality of stationary charge carrier storage portions
US4799244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 30, 1986 |
| Grant date | Jan 17, 1989 |
| Priority date | — |
| Expiry date | Jun 30, 2006 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH10F39/80
- WIPO fieldComputer technology
- WIPO sectorElectrical engineering
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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.