US4900969A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Surface acoustic wave convolver
Assignee: Faurecia Clarion Electronics Co Ltd
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Filing: 1988-04-08
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Granted: 1990-02-13
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Expires: 2008-04-08
Abstract
Abstract A SAW convolver is disclosed, in which an auxiliary electrode is disposed between the gate electrode and each of two input electrodes and self convolution is reduced by applying to the auxiliary electrodes such a bias voltage that the portion of the semiconductor layer below each auxiliary electrode is inverted.
Inventors
- 👤 Syuichi Mitsutsuka
- 👤 Takeshi Okamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 21:23
CPC Classifications
G; G06; G06G; G06G7/00; G06G7/12; G06G7/19; G06G7/195
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
116 words
A surface acoustic wave convolver, comprising: a multi-layered structure which includes a piezoelectric layer and includes a semiconductor layer having a surface; a pair of spaced input electrodes disposed on said piezoelectric layer; a gate electrode which is disposed along a propagation path of surface acoustic waves in said piezoelectric layer at a location between said input electrodes and which extracts convolution signals from said convolver; two auxiliary electrodes each disposed between said gate electrode and a respective one of said input electrodes; and means for applying to each said auxiliary electrode a bias voltage which causes portions of said surface of said semiconductor layer located below said auxiliary electrodes to be in an inverted state.
Claim 2
Dependent Claim
116 words
A surface acoustic wave convolver, comprising: a multi-layered structure which includes a piezoelectric layer and includes a semiconductor layer having a surface; a pair of spaced input electrodes disposed on said piezoelectric layer; a gate electrode which is disposed along a propagation path of surface acoustic waves in said piezoelectric layer at a location between said input electrodes and which extracts convolution signals from said convolver; two auxiliary electrodes each disposed between said gate electrode and a respective one of said input electrodes; and means for applying to each said auxiliary electrode a bias voltage which causes portions of said surface of said semiconductor layer located below said auxiliary electrodes to be in an inverted state.
Claim 3
Dependent Claim
17 words
A surface acoustic wave convolver according to claim 1, wherein said semiconductor layer is made of Si.
Claim 4
Dependent Claim
17 words
A surface acoustic wave convolver according to claim 1, wherein said semiconductor layer is made of GaAs.
Claim 5
Dependent Claim
17 words
A surface acoustic wave convolver according to claim 1, wherein said piezoelectric layer is made of ZnO.
Claim 6
Dependent Claim
17 words
A surface acoustic wave convolver according to claim 1, wherein said piezoelectric layer is made of AlN.
Claim 7
Dependent Claim
18 words
A surface acoustic weave convolver according to claim 4, wherein the surface acoustic wave is a Sezawa wave.
Claim 8
Dependent Claim
26 words
A surface acoustic wave convolver according to claim 1, wherein said multi-layer structure includes an insulating layer provided between said piezoelectric layer and said semiconductor layer.
Claim 9
Dependent Claim
19 words
A surface acoustic wave convolver according to claim 7, wherein said insulating layer is made of SiO 2 .
Claim 10
Dependent Claim
16 words
A surface acoustic wave convolver according to claim 1, wherein said input electrodes are interdigital electrodes.
Claim 11
Dependent Claim
35 words
A surface acoustic wave convolver according to claim 6, wherein said semiconductor layer is made of Si having a facial orientation of (110) and wherein the propagation direction of the surface acoustic wave is [100].
Claim 12
Dependent Claim
35 words
A surface acoustic wave convolver according to claim 6, wherein said semiconductor layer is made of Si having a facial orientation of (100) and wherein the propagation direction of the surface acoustic wave is [100].
Claim 13
Dependent Claim
55 words
A surface acoustic wave convolver according to claim 7, wherein said input electrodes, said gate electrodes and said auxiliary electrodes are provided on a side of said piezoelectric layer remote from said insulating layer and semiconductor layer, and including a ground electrode provided on a side of said semiconductor layer remote from said insultaing layer.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-02-12 | 1993-08-14 | 1994-02-13 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-02-12 | 1997-08-14 | 1998-02-13 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-02-12 | 2001-08-14 | 2002-02-13 | $7700.00 | Window Closed / Lapsed |