Patent US5159299A successfully refreshed from Google Patents.
US5159299A
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HACT electrode configuration
Assignee: RTX Corp
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Filing: 1990-10-02
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Granted: 1992-10-27
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Expires: 2010-10-02
Abstract
Abstract A heterostructure acoustic charge transport (HACT) device having a number of signal tap electrodes has revealed unexpected insensitivity to electrode spacing and unexpected sensitivity to electrode width. Spacing of one SAW wavelength between consecutive electrodes and an electrode width of λ/20 are preferred.
Inventors
- 👤 Donald E. Cullen
- 👤 Sears W. Merritt
- 👤 William J. Tanski
- 👤 Emilio J. Branciforte
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-05 07:11
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/0296; H03H9/02976
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
130 words
A heterostructure acoustic charge transport device having a charge transport layer of one composition having a top surface and being disposed above a charge confinement layer of a second composition, for carrying charge packets along a channel axis in said charge transport layer from a source electrode to a drain electrode under the influence of a SAW generated by a SAW transducer, said SAW having a predetermined SAW wavelength λ; a device surface, carrying said source and drain electrodes and a set of signal electrodes, said signal electrodes being divided into a signal set and a reference set, disposed in alternation on said surface with a differential spacing therebetween of substantially λ; and said set of signal electrodes have an electrode width along said channel axis of less than λ/8.
Claim 2
Dependent Claim
130 words
A heterostructure acoustic charge transport device having a charge transport layer of one composition having a top surface and being disposed above a charge confinement layer of a second composition, for carrying charge packets along a channel axis in said charge transport layer from a source electrode to a drain electrode under the influence of a SAW generated by a SAW transducer, said SAW having a predetermined SAW wavelength λ; a device surface, carrying said source and drain electrodes and a set of signal electrodes, said signal electrodes being divided into a signal set and a reference set, disposed in alternation on said surface with a differential spacing therebetween of substantially λ; and said set of signal electrodes have an electrode width along said channel axis of less than λ/8.
Claim 3
Dependent Claim
24 words
A heterostructure acoustic charge transport device according to claim 1, in which said device surface is said top surface of said charge transport layer.
Claim 4
Dependent Claim
23 words
A heterostructure acoustic charge transport device according to claim 1, in which said one composition is GaAs and said second composition is (Al,Ga)As.
Claim 5
Dependent Claim
36 words
A heterostructure acoustic charge transport device according to claim 1, in which at least one intermediate layer of said second composition is interposed between said device surface and said top surface of said charge transport layer.
Claim 6
Dependent Claim
23 words
A heterostructure acoustic charge transport device according to claim 4, in which said one composition is GaAs and said second composition is (Al,Ga)As.
Claim 7
Dependent Claim
114 words
A heterostructure acoustic charge transport device including a charge transport layer having a top surface and being disposed above a substrate, for carrying charge packets along a channel axis in said charge transport layer from a source electrode to a drain electrode under the influence of a SAW having a predetermined SAW wavelength λ; a device surface, carrying said source and drain electrodes and a set of signal electrodes, said signal electrodes being divided into a signal set and a reference set, disposed in alternation on said surface with a differential spacing therebetweeen of substantially λ; and said set of signal electrodes have an electrode width along said channel axis of less than λ/8.
Claim 8
Dependent Claim
114 words
A heterostructure acoustic charge transport device including a charge transport layer having a top surface and being disposed above a substrate, for carrying charge packets along a channel axis in said charge transport layer from a source electrode to a drain electrode under the influence of a SAW having a predetermined SAW wavelength λ; a device surface, carrying said source and drain electrodes and a set of signal electrodes, said signal electrodes being divided into a signal set and a reference set, disposed in alternation on said surface with a differential spacing therebetweeen of substantially λ; and said set of signal electrodes have an electrode width along said channel axis of less than λ/8.
Claim 9
Dependent Claim
23 words
A heterostructure charge transport device according to claim 6, in which said device surface is said top surface of said charge transport layer.
Claim 10
Dependent Claim
29 words
A heterostructure charge transport device according to claim 6, in which an intermediate layer is interposed between said device surface and said top surface of said charge transport layer.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-10-27 | 1996-04-27 | 1996-10-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-10-27 | 2000-04-27 | 2000-10-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-10-27 | 2004-04-27 | 2004-10-27 | $7700.00 | Window Closed / Lapsed |