US4894689A
Expired / Lapsed
US
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Transferred electron device
Assignee: Nokia Bell Labs
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Filing: 1984-12-28
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Granted: 1990-01-16
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Expires: 2004-12-28
Abstract
Abstract A transferred electron device is described in which the charge of the drifting packets is imaged perpendicular to the charge-packet direction so that essentially all of the packet-averaged, space-charge field is normal to the drift direction. This permits continuous formation of contiguous charge packets.
Inventors
- 👤 James A. Cooper, Jr.
- 👤 Karvel K. Thornber
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 00:27
CPC Classifications
H; H10; H10N; H10N80/00; H10N80/10
Claims Analysis
Total Claims: 12
Claim 1
Independent Claim
76 words
A microwave device comprising a semiconductor region, said region having a regime of negative differential mobility; a source of carriers in said region; a drain electrode to said region, a channel in said region between said source and said drain electrode; an electrically conducting region separated from said channel; and first and second electrodes to said electrically conducting region, at least two of said electrodes biasing said semiconductor region into said regime of negative differential mobility.
Claim 2
Dependent Claim
76 words
A microwave device comprising a semiconductor region, said region having a regime of negative differential mobility; a source of carriers in said region; a drain electrode to said region, a channel in said region between said source and said drain electrode; an electrically conducting region separated from said channel; and first and second electrodes to said electrically conducting region, at least two of said electrodes biasing said semiconductor region into said regime of negative differential mobility.
Claim 3
Dependent Claim
21 words
A device as recited in claim 1 further comprising an insulator region between said electrically conducting region and said semiconductor region.
Claim 4
Dependent Claim
26 words
A device as recited in claim 2 in which said insulator region comprises a material having a bandgap higher than the bandgap of said semiconductor region.
Claim 5
Dependent Claim
22 words
A device as recited in claim 3 in which said insulator region has a varying thickness between said source and drain electrode.
Claim 6
Dependent Claim
22 words
A device as recited in claim 3 in which said insulator region has variable doping between said source and said drain electrode.
Claim 7
Dependent Claim
15 words
A device as recited in claim 1 in which said channel comprises a potential well.
Claim 8
Dependent Claim
27 words
A device as recited in claim 1 in which the separation between said electrically conducting region and said channel varies between said source and said drain electrode.
Claim 9
Dependent Claim
18 words
A device as recited in claim 7 in which said separation is a maximum near said source electrode.
Claim 10
Dependent Claim
18 words
A device as recited in claim 7 in which said separation is a minimum near said source electrode.
Claim 11
Dependent Claim
18 words
A device as recited in claim 1 in which said source comprises a source electrode to said region.
Claim 12
Dependent Claim
18 words
A device as recited in claim 1 in which said source comprises means for optically illuminating said region.
References Cited (Backward Citations)
US3439236A
Cited
US3587000A
Cited
US3714522A
Cited
US3766372A
Cited
US4245233A
Cited
US4236165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1993-01-15 | 1993-07-17 | 1994-01-16 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-01-15 | 1997-07-17 | 1998-01-16 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-01-15 | 2001-07-17 | 2002-01-16 | $7700.00 | Window Closed / Lapsed |