US4430630A
Expired / Lapsed
US
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Tuning circuit
Assignee: Pioneer Corp
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Filing: 1981-11-19
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Granted: 1984-02-07
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Expires: 2001-11-19
Abstract
Abstract To suppress a fluctuation in resonance frequency caused by an input signal voltage in a tunable circuit, a respective capacitor is connected to each of two variable capacitance diodes connected in series-opposition.
Inventors
- 👤 Masaharu Sakamoto
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 16:39
CPC Classifications
H; H03; H03H; H03H5/00; H03H5/12; H03J; H03J3/00; H03J3/02; H03J3/16; H03J3/18; H03J3/185
Claims Analysis
Total Claims: 3
Claim 1
Independent Claim
102 words
A tuning circuit of the type including first and second variable capacitance diodes each of said diodes having first and second terminals said diodes connected in series opposition with their first terminals connected to a common connection point, means for applying a d.c. bias voltage to said common connection point between said diodes, and means for applying a signal across said second terminals of said diodes, the improvement comprising: a first capacitor connected in parallel between said first and second terminals of said first diode; and a second capacitor connected in parallel between said first and second terminals of said second diode.
Claim 2
Dependent Claim
102 words
A tuning circuit of the type including first and second variable capacitance diodes each of said diodes having first and second terminals said diodes connected in series opposition with their first terminals connected to a common connection point, means for applying a d.c. bias voltage to said common connection point between said diodes, and means for applying a signal across said second terminals of said diodes, the improvement comprising: a first capacitor connected in parallel between said first and second terminals of said first diode; and a second capacitor connected in parallel between said first and second terminals of said second diode.
Claim 3
Dependent Claim
20 words
A tuning circuit as claimed in claim 1, further comprising a third capacitor (c) coupled across both of said diodes.
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) | 1987-02-06 | 1987-08-08 | 1988-02-07 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1991-02-06 | 1991-08-08 | 1992-02-07 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1995-02-06 | 1995-08-08 | 1996-02-07 | $7700.00 | Window Closed / Lapsed |