US3697786A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Capacitively driven charge transfer devices
Assignee: AT&T Inc
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Filing: 1971-03-29
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Granted: 1972-10-10
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Expires: 1991-03-29
Abstract
Abstract This application describes arrangements for capacitively driving a charge transfer device. In particular, a charge transfer device is disposed between the plates of a capacitor and is adapted such that the desired unidirectionality of transfer of charge therethrough is achieved in response to application of an alternating potential to the capacitor.
Inventors
- 👤 George Elwood Smith
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 17:36
CPC Classifications
H; H10; H10D; H10D44/00; H10D44/40; H10D44/45; H10D44/472
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
126 words
Apparatus comprising: a first conductive plate for forming one plate of a capacitor; a second conductive plate for forming the other plate of said capacitor; a charge transfer device disposed between said plates; said charge transfer device of the type adapted for the storage and serial transfer, from an input to an output, of charge carriers localized in induced potential energy minima along a surface portion of a suitable storage medium by sequentially applying differing potentials to portions of the surface through field plate electrodes; means for inducing an asymmetrical potential well under each of said field plate electrodes; and means for isolating the potential well under every second one of said field plate electrodes from the affects of an electric field produced within said capacitor.
Claim 2
Dependent Claim
126 words
Apparatus comprising: a first conductive plate for forming one plate of a capacitor; a second conductive plate for forming the other plate of said capacitor; a charge transfer device disposed between said plates; said charge transfer device of the type adapted for the storage and serial transfer, from an input to an output, of charge carriers localized in induced potential energy minima along a surface portion of a suitable storage medium by sequentially applying differing potentials to portions of the surface through field plate electrodes; means for inducing an asymmetrical potential well under each of said field plate electrodes; and means for isolating the potential well under every second one of said field plate electrodes from the affects of an electric field produced within said capacitor.
Claim 3
Dependent Claim
28 words
Apparatus in accordance with claim 1 in which the asymmetry of said potential wells is such as to enhance movement of charge from said input to said output.
Claim 4
Dependent Claim
30 words
Apparatus in accordance with claim 1 in which the means for inducing the asymmetrical potential wells under said field plate electrodes comprises quantities of fixed charge disposed under said electrodes.
Claim 5
Dependent Claim
18 words
Apparatus in accordance with claim 3 wherein said quantities of fixed charge are disposed within said storage medium.
Claim 6
Dependent Claim
43 words
Apparatus in accordance with claim 3 in which the quantity of fixed charge under each electrode is disposed thereunder such that it induces a potential well whose asymmetry is such as to enhance the movement of charge from said input to said output.
Claim 7
Dependent Claim
54 words
Apparatus in accordance with claim 1 wherein said means for isolating the potential well under every second one of said field plate electrodes from an electric field within said capacitor comprises a plurality of conduction paths, each of whIch conductively couples a different one of said second field plate electrodes to said storage medium.
Claim 8
Dependent Claim
37 words
Apparatus in accordance with claim 1 wherein said charge transfer device further includes a dielectric layer which overlies and is contiguous with said surface of said medium, and upon which said field plate electrodes are serially disposed.
Claim 9
Dependent Claim
14 words
Apparatus in accordance with claim 7 wherein said dielectric layer is of nonuniform thickness.
Claim 10
Dependent Claim
78 words
Apparatus in accordance with claim 8 wherein said means for inducing an asymmetrical potential well under each of said field plate electrodes comprises: a first voltage source connected between said storage medium and every second one of said field plate electrodes for inducing under each of said second field plate electrodes an asymmetrical potential well; a second voltage source connected between said capacitor plates for inducing under each of the remaining field plate electrodes an asymmetrical potential well.
Claim 11
Dependent Claim
13 words
Apparatus in accordance with claim 1 wherein said storage medium is a semiconductor.
Claim 12
Dependent Claim
13 words
Apparatus in accordance with claim 1 wherein said storage medium is an insulator.
Claim 13
Dependent Claim
44 words
Apparatus in accordance with claim 1 which includes, in addition, means for applying a variable voltage between said capacitor plates thereby causing a charge packet, introduced into said input of said charge transfer device, to be transferred therethrough to said output of said device.
References Cited (Backward Citations)
US3623026A
Cited
US3651349A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-10-10 | 1976-04-10 | 1976-10-10 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-10-10 | 1980-04-10 | 1980-10-10 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-10-10 | 1984-04-10 | 1984-10-10 | $7700.00 | Window Closed / Lapsed |