US3585414A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Continuously tunable varactor
Assignee: Sprague Electric Co
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Filing: 1969-08-07
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Granted: 1971-06-15
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Expires: 1989-08-07
Abstract
Abstract A resistive plate insulatively spaced from a semiconductive body, is adapted for application of potential gradient thereacross such that capacitance between the plate and body varies substantially continuously in accordance with said potential gradient.
Inventors
- 👤 Mario Ghezzo
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 14:17
CPC Classifications
H; H10; H10D; H10D1/00; H10D1/60; H10D1/62; H10D1/64; H10P; H10P95/00
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
107 words
A varactor comprising a body of monocrystalline semiconductive material of one conductivity type, a layer of insulative material disposed on the surface of said body, a layer of resistive material overlying said insulative layer, a pair of spaced contacts in substantially ohmic contact to said resistive layer, output terminals in connection to a first of said pair of contacts and said body, and variable voltage means to apply a voltage gradient across said resistive layer between said contacts for producing an inversion region of variable planar area within said semiconductive body whereby the capacitance between said output terminals is continuously tunable in accordance with said variable voltage.
Claim 2
Dependent Claim
107 words
A varactor comprising a body of monocrystalline semiconductive material of one conductivity type, a layer of insulative material disposed on the surface of said body, a layer of resistive material overlying said insulative layer, a pair of spaced contacts in substantially ohmic contact to said resistive layer, output terminals in connection to a first of said pair of contacts and said body, and variable voltage means to apply a voltage gradient across said resistive layer between said contacts for producing an inversion region of variable planar area within said semiconductive body whereby the capacitance between said output terminals is continuously tunable in accordance with said variable voltage.
Claim 3
Dependent Claim
57 words
The varactor of claim 1 including means for biasing the first of said spaced contact pair with respect to said body at a potential of polarity and magnitude for producing an inversion layer within said body, and the second of said contacts being biased at a potential of polarity and magnitude as to exclude an inversion layer.
Claim 4
Dependent Claim
30 words
The varactor of claim 1 wherein said resistive layer is a circular configuration having one of said spaced contacts at the center and the other at the outer periphery thereof.
Claim 5
Dependent Claim
24 words
The varactor of claim 1 wherein said resistive layer is an elongated layer having contacts spaced apart on the longitudinal axis of said layer.
Claim 6
Dependent Claim
12 words
The varactor of claim 4 wherein said layer is of uniform width.
Claim 7
Dependent Claim
40 words
The varactor of claim 4 wherein said body is of substantially monocrystalline silicon of one conductivity type, said insulative layer is a compound of said body, and said resistive layer has a surface resistivity of approximately 1,000 ohms per square.
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) | 1974-06-14 | 1974-12-14 | 1975-06-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-06-14 | 1978-12-14 | 1979-06-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-06-14 | 1982-12-14 | 1983-06-15 | $7700.00 | Window Closed / Lapsed |