Patent US5043681A successfully refreshed from Google Patents.
US5043681A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage controlled oscillator including a saw resonator
Assignee: Alps Alpine Co Ltd
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Filing: 1990-05-18
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Granted: 1991-08-27
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Expires: 2010-05-18
Abstract
Abstract A voltage controlled oscillator includes a resonant circuit formed of an impedance in series with a voltage variable capacitance. The impedance consists of a surface acoustic wave resonator in parallel with either an inductance coil or another acoustic wave resonator.
Inventors
- 👤 Takeshi Tanemura
- 👤 Takehiko Sone
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 17:13
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/30; H03B5/32; H03B5/326
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
36 words
A voltage controlled oscillator comprising a resonant circuit formed of an impedance in series with a voltage variable capacitance, wherein said impedance consists of a surface acoustic wave resonator connected in parallel with an inductance coil.
Claim 2
Dependent Claim
36 words
A voltage controlled oscillator comprising a resonant circuit formed of an impedance in series with a voltage variable capacitance, wherein said impedance consists of a surface acoustic wave resonator connected in parallel with an inductance coil.
Claim 3
Dependent Claim
33 words
The voltage controlled oscillator as recited in claim 1 wherein said surface acoustic wave resonator and said inductance coil are connected in parallel with respect to an input signal received by said impedance.
Claim 4
Dependent Claim
24 words
The voltage controlled oscillator as recited in claim 1 wherein said surface acoustic wave resonator is connected directly in parallel with said inductance coil.
Claim 5
Dependent Claim
34 words
A voltage controlled oscillator comprising a resonant circuit formed of an impedance in series with a voltage variable capacitance, wherein said impedance consists of at least two surface acoustic wave resonators connected in parallel.
Claim 6
Dependent Claim
34 words
A voltage controlled oscillator comprising a resonant circuit formed of an impedance in series with a voltage variable capacitance, wherein said impedance consists of at least two surface acoustic wave resonators connected in parallel.
Claim 7
Dependent Claim
101 words
A voltage controlled oscillator comprising: a control voltage input terminal for receiving a voltage signal to control an oscillation frequency of said voltage controlled oscillator; a choke coil coupled to said control voltage input terminal; a voltage variable capacitance coupled to said choke coil; a resonant circuit formed of an impedance in series with said voltage variable capacitance, wherein said impedance consists of a surface acoustic wave resonator connected in parallel with an inductance coil; a DC blocking capacitor coupled to said resonant circuit; and an oscillator output terminal coupled to said DC blocking capacitor for providing an oscillator output signal.
Claim 8
Dependent Claim
101 words
A voltage controlled oscillator comprising: a control voltage input terminal for receiving a voltage signal to control an oscillation frequency of said voltage controlled oscillator; a choke coil coupled to said control voltage input terminal; a voltage variable capacitance coupled to said choke coil; a resonant circuit formed of an impedance in series with said voltage variable capacitance, wherein said impedance consists of a surface acoustic wave resonator connected in parallel with an inductance coil; a DC blocking capacitor coupled to said resonant circuit; and an oscillator output terminal coupled to said DC blocking capacitor for providing an oscillator output signal.
Claim 9
Dependent Claim
99 words
A voltage controlled oscillator comprising: a control voltage input terminal for receiving a voltage signal to control an oscillation frequency of said voltage controlled oscillator; a choke coil coupled to said control voltage input terminal; a voltage variable capacitance coupled to said choke coil; a resonant circuit formed of an impedance in series with said voltage variable capacitance, wherein said impedance consists of at least two surface acoustic wave resonators connected in parallel; a DC blocking capacitor coupled to said resonant circuit; and an oscillator output terminal coupled to said DC blocking capacitor for providing an oscillator output signal.
Claim 10
Dependent Claim
99 words
A voltage controlled oscillator comprising: a control voltage input terminal for receiving a voltage signal to control an oscillation frequency of said voltage controlled oscillator; a choke coil coupled to said control voltage input terminal; a voltage variable capacitance coupled to said choke coil; a resonant circuit formed of an impedance in series with said voltage variable capacitance, wherein said impedance consists of at least two surface acoustic wave resonators connected in parallel; a DC blocking capacitor coupled to said resonant circuit; and an oscillator output terminal coupled to said DC blocking capacitor for providing an oscillator output signal.
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) | 1994-08-26 | 1995-02-25 | 1995-08-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-08-26 | 1999-02-25 | 1999-08-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-08-26 | 2003-02-25 | 2003-08-27 | $7700.00 | Window Closed / Lapsed |