US5128579A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Act electrode configuration for linear readout
Assignee: RTX Corp
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Filing: 1990-10-02
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Granted: 1992-07-07
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Expires: 2010-10-02
Abstract
Abstract An acoustic charge transport device having a number of signal tap electrodes has revealed unexpected insensitivity to electrode spacing and unexpected sensitivity to electrode width. Spacing of one-half SAW wavelength between consecutive electrodes and an electrode width of λ/20 are preferred for low frequency response.
Inventors
- 👤 Roger D. Carroll
- 👤 Sears W. Merritt
- 👤 Donald E. Cullen
- 👤 Emilio J. Branciforte
- 👤 William J. Tanski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 23:26
CPC Classifications
H; H03; H03H; H03H9/00; H03H9/02; H03H9/02535; H03H9/0296; H03H9/02976
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
130 words
A heterostructure acoustic charge transport device having a charge transport layer of one composition disposed 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 and 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/2; 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 disposed 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 and 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/2; and said set of signal electrodes have an electrode width along said channel axis of less than λ/8.
Claim 3
Dependent Claim
23 words
An 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
22 words
An acoustic charge transport device according to claim 2, in which said first composition is GaAs and said second composition is (Al,Ga)As.
Claim 5
Dependent Claim
35 words
An 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
22 words
An acoustic charge transport device according to claim 4, in which said first composition is GaAs and said second composition is (Al,Ga)As.
References Cited (Backward Citations)
US4016412A
Cited
US4055758A
Cited
US4233573A
Cited
US4600853A
Cited
US4926146A
Cited
US4884001A
Cited
US4990814A
Cited
US5047363A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1995-07-07 | 1996-01-06 | 1996-07-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-07-07 | 2000-01-06 | 2000-07-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-07-07 | 2004-01-06 | 2004-07-07 | $7700.00 | Window Closed / Lapsed |