US4621205A
Expired / Lapsed
US
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Method and apparatus for reducing varactor noise
Assignee: HP Inc
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Filing: 1984-01-16
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Granted: 1986-11-04
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Expires: 2004-01-16
Abstract
Abstract The deliberate use of multiple, seemingly redundant, varactor diodes to reduce noise in applications where a single varactor diode would otherwise be adequate.
Inventors
- 👤 Brian M. Miller
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 06:52
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/02; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/22; H03B2200/00; H03B2200/003; H03B2200/004; H03B2200/006; H03B2200/0088; H03J; H03J2200/00; H03J2200/36
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
40 words
Apparatus for reducing varactor diode-induced noise in electronic circuits, said apparatus comprising an array of series-conducted blocks of parallel-connected varactor diodes, said array of varactor diodes having a total capacitance equivalent to the capacitance of one such such varactor diode.
Claim 2
Dependent Claim
40 words
Apparatus for reducing varactor diode-induced noise in electronic circuits, said apparatus comprising an array of series-conducted blocks of parallel-connected varactor diodes, said array of varactor diodes having a total capacitance equivalent to the capacitance of one such such varactor diode.
Claim 3
Dependent Claim
14 words
Apparatus as in claim 1 wherein said varactor diodes have substantially identical electrical characteristics.
Claim 4
Dependent Claim
16 words
Apparatus as in claim 2 wherein said varactor diodes are biased at substantially the same voltage.
Claim 5
Dependent Claim
56 words
Apparatus as in claim 3 wherein said array of varactor diodes comprises an array of K rows and K columns of varactor diodes, where K is an integer greater than 1 said array having the varactor diode-induced noise reduced by a factor of approximately the square root of the number of varactor diodes in the array.
Claim 6
Independent Claim
60 words
A method for reducing varactor diode-induced noise in electronic circuits, said method comprising the steps of connecting a plurality of varactor diodes in parallel to form a block, and connecting a plurality of said blocks in series to form an array, wherein said array of varactor diodes having a total capacitance equivalent to the capacitance of one such varactor diode.
Claim 7
Independent Claim
60 words
A method for reducing varactor diode-induced noise in electronic circuits, said method comprising the steps of connecting a plurality of varactor diodes in parallel to form a block, and connecting a plurality of said blocks in series to form an array, wherein said array of varactor diodes having a total capacitance equivalent to the capacitance of one such varactor diode.
Claim 8
Dependent Claim
14 words
The method of claim 5 wherein said varactor diodes have substantially identical electrical characteristics.
Claim 9
Dependent Claim
21 words
The method of claim 6 further including the step of biasing each of the varactor diodes at substantially the same voltage.
Claim 10
Dependent Claim
25 words
The method of claim 7 wherein said array comprises K rows and K columns of varactor diodes where K is an integer greater than 1.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1989-11-03 | 1990-05-05 | 1990-11-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1993-11-03 | 1994-05-05 | 1994-11-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1997-11-03 | 1998-05-05 | 1998-11-04 | $7700.00 | Window Closed / Lapsed |