US4801898A
Expired / Lapsed
US
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Voltage-controlled oscillator
Assignee: Kokusai Denki Electric Inc
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Filing: 1988-03-17
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Granted: 1989-01-31
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Expires: 2008-03-17
Abstract
Abstract A voltage-controlled oscillator includes a negative resistance generator, a resonant circuit, a first series circuit, a second series circuit, and a third series circuit. The first series circuit controls an oscillation frequency for changing a resonant frequency of the resonant circuit, and the second series circuit modulates this frequency. The third series circuit consists of a capacitor and a variable capacitance diode to which the modulation signal is supplied. The third series circuit changes the resonant frequency of the resonant circuit in a direction for cancelling a change in modulation sensitivity caused by the second series circuit.
Inventors
- 👤 Katsuki Obayashi
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 13:24
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1237; H03B5/124; H03B5/1243; H03B2200/00; H03B2200/003; H03B2200/004; H03B2201/00; H03B2201/02; H03B2201/0208; H03B7/00; H03B7/02; H03B7/06; H03C; H03C2200/00; H03C2200/0037; H03C2200/005; H03C2200/0079; H03C3/00; H03C3/10; H03C3/12; H03C3/22
Claims Analysis
Total Claims: 36
Claim 1
Independent Claim
140 words
A voltage-controlled oscillator comprising: a negative resistance generator; a resonant circuit excited by said negative resistance generator and including an inductance; a first series circuit, consisting of a first capacitor and a first variable capacitance diode to which a control voltage is applied, for controlling an oscillation frequency for changing a resonant frequency of said resonant circuit; a second series circuit, consisting of a second capacitor and a second variable capacitance diode to which a modulation signal is supplied, for modulating a frequency for changing the resonant frequency of said resonant circuit; and a third series circuit, consisting of a third capacitor and a third variable capacitance diode to which the modulation signal is supplied, for changing the resonant frequency of said resonant circuit in a direction for canceling a change in modulation sensitivity caused by said second series circuit.
Claim 2
Dependent Claim
140 words
A voltage-controlled oscillator comprising: a negative resistance generator; a resonant circuit excited by said negative resistance generator and including an inductance; a first series circuit, consisting of a first capacitor and a first variable capacitance diode to which a control voltage is applied, for controlling an oscillation frequency for changing a resonant frequency of said resonant circuit; a second series circuit, consisting of a second capacitor and a second variable capacitance diode to which a modulation signal is supplied, for modulating a frequency for changing the resonant frequency of said resonant circuit; and a third series circuit, consisting of a third capacitor and a third variable capacitance diode to which the modulation signal is supplied, for changing the resonant frequency of said resonant circuit in a direction for canceling a change in modulation sensitivity caused by said second series circuit.
Claim 3
Dependent Claim
29 words
An oscillator according to claim 1, wherein said resonant circuit is a parallel resonant circuit and said first series circuit is connected in parallel with said parallel resonant circuit.
Claim 4
Dependent Claim
32 words
An oscillator according to claim 1, wherein said resonant circuit is a series resonant circuit and said first series circuit is connected in series with an inductance of said series resonant circuit.
Claim 5
Dependent Claim
48 words
An oscillator according to claim 1, wherein said resonant circuit is a series resonant circuit, said second series circuit is connected in series with an inductance of said series resonant circuit, and said first series circuit is connected in parallel with said inductance and said second series circuit.
Claim 6
Dependent Claim
38 words
An oscillator according to claim 2, wherein said second series circuit is connected in parallel with said parallel resonant circuit and said third series circuit is connected in parallel with said first capacitor of said first series circuit.
Claim 7
Dependent Claim
46 words
An oscillator according to claim 2 or 3, wherein said second series circuit is connected in parallel with said first capacitor of said first series circuit and said third series circuit is connected in parallel with said first variable capacitance diode of said first series circuit.
Claim 8
Dependent Claim
38 words
An oscillator according to claim 3, wherein said second series circuit is connected in parallel with said first capacitor of said first series circuit and said third series circuit is connected in parallel with said first series circuit
Claim 9
Dependent Claim
48 words
An oscillator according to claim 3, wherein said second series circuit is connected in parallel with said first variable capacitance diode of said first series circuit and said third series circuit is connected in parallel with said inductance of said series resonant circuit and said first series circuit.
Claim 10
Dependent Claim
42 words
An oscillator according to claim 3, wherein said second series circuit is connected in parallel with said first series circuit and said third series circuit is connected in parallel with said inductance of said series resonant circuit and said first series circuit.
Claim 11
Dependent Claim
25 words
An oscillator according to claim 4, wherein said third series circuit is connected in parallel with said first variable diode of said first series circuit.
Claim 12
Dependent Claim
28 words
An oscillator according to claim 4, wherein said third series circuit is connected in parallel with said inductance of said series resonant circuit and said second series circuit.
Claim 13
Dependent Claim
179 words
A voltage-controlled oscillator comprising: a negative resistance generator; a resonant circuit excited by said negative resistance generator and including an inductance; a first series circuit, consisting of a first capacitor and a first variable capacitance diode to which a control voltage is applied, for controlling an oscillation frequency for changing a resonant frequency of said resonant circuit; a second series circuit, consisting of a second capacitor and a second variable capacitance diode to which a modulation signal is supplied, for modulating a frequency for changing the resonant frequency of said resonant circuit; a third series circuit, consisting of a third capacitor and a third variable capacitance diode to which the modulation signal is supplied, for changing the resonant frequency of said resonant circuit in a direction for canceling a change in modulation sensitivity caused by said second series circuit; a bias circuit for applying a DC bias voltage to said second and third variable diodes; and variable voltage dividers each inserted in a corresponding one of paths for supplying modulation signals to said second and third variable capacitance diodes.
Claim 14
Dependent Claim
179 words
A voltage-controlled oscillator comprising: a negative resistance generator; a resonant circuit excited by said negative resistance generator and including an inductance; a first series circuit, consisting of a first capacitor and a first variable capacitance diode to which a control voltage is applied, for controlling an oscillation frequency for changing a resonant frequency of said resonant circuit; a second series circuit, consisting of a second capacitor and a second variable capacitance diode to which a modulation signal is supplied, for modulating a frequency for changing the resonant frequency of said resonant circuit; a third series circuit, consisting of a third capacitor and a third variable capacitance diode to which the modulation signal is supplied, for changing the resonant frequency of said resonant circuit in a direction for canceling a change in modulation sensitivity caused by said second series circuit; a bias circuit for applying a DC bias voltage to said second and third variable diodes; and variable voltage dividers each inserted in a corresponding one of paths for supplying modulation signals to said second and third variable capacitance diodes.
Claim 15
Dependent Claim
29 words
An oscillator according to claim 12, wherein said resonant circuit is a parallel resonant circuit and said first series circuit is connected in parallel with said parallel resonant circuit.
Claim 16
Dependent Claim
32 words
An oscillator according to claim 12, wherein said resonant circuit is a series resonant circuit and said first series circuit is connected in series with an inductance of said series resonant circuit.
Claim 17
Dependent Claim
48 words
An oscillator according to claim 12, wherein said resonant circuit is a series resonant circuit, said second series circuit is connected in series with an inductance of said series resonant circuit, and said first series circuit is connected in parallel with said inductance and said second series circuit.
Claim 18
Dependent Claim
38 words
An oscillator according to claim 13, wherein said second series circuit is connected in parallel with said parallel resonant circuit and said third series circuit is connected in parallel with said first capacitor of said first series circuit.
Claim 19
Dependent Claim
46 words
An oscillator according to claim 13 or 14, wherein said second series circuit is connected in parallel with said first capacitor of said first series circuit and said third series circuit is connected in parallel with said first variable capacitance diode of said first series circuit.
Claim 20
Dependent Claim
38 words
An oscillator according to claim 14, wherein said second series circuit is connected in parallel with said first capacitor of said first series circuit and said third series circuit is connected in parallel with said first series circuit.
Claim 21
Dependent Claim
48 words
An oscillator according to claim 14, wherein said second series circuit is connected in parallel with said first variable capacitance diode of said first series circuit and said third series circuit is connected in parallel with said inductance of said series resonant circuit and said first series circuit.
Claim 22
Dependent Claim
42 words
An oscillator according to claim 14, wherein said second series circuit is connected in parallel with said first series circuit and said third series circuit is connected in parallel with said inductance of said series resonant circuit and said first series circuit.
Claim 23
Dependent Claim
25 words
An oscillator according to claim 15, wherein said third series circuit is connected in parallel with said first variable diode of said first series circuit.
Claim 24
Dependent Claim
28 words
An oscillator according to claim 15, wherein said third series circuit is connected in parallel with said inductance of said series resonant circuit and said second series circuit.
Claim 25
Dependent Claim
162 words
A voltage-controlled oscillator comprising: a negative resistance generator; a resonant circuit excited by said negative resistance generator and including an inductance; a first series circuit, consisting of a first capacitor and a first variable capacitance diode to which a control voltage is applied, for controlling an oscillation frequency for changing a resonant frequency of said resonant circuit; a second series circuit, consisting of a second capacitor and a second variable capacitance diode to which a modulation signal is supplied, for modulating a frequency for changing the resonant frequency of said resonant circuit; a third series circuit, consisting of a third capacitor and a third variable capacitance diode to which the modulation signal is supplied, for changing the resonant frequency of said resonant circuit in a direction for canceling a change in modulation sensitivity caused by said second series circuit; and a superposing circuit for superposing and supplying the modulation signal and the control voltage to said second and third variable capacitance diodes.
Claim 26
Dependent Claim
162 words
A voltage-controlled oscillator comprising: a negative resistance generator; a resonant circuit excited by said negative resistance generator and including an inductance; a first series circuit, consisting of a first capacitor and a first variable capacitance diode to which a control voltage is applied, for controlling an oscillation frequency for changing a resonant frequency of said resonant circuit; a second series circuit, consisting of a second capacitor and a second variable capacitance diode to which a modulation signal is supplied, for modulating a frequency for changing the resonant frequency of said resonant circuit; a third series circuit, consisting of a third capacitor and a third variable capacitance diode to which the modulation signal is supplied, for changing the resonant frequency of said resonant circuit in a direction for canceling a change in modulation sensitivity caused by said second series circuit; and a superposing circuit for superposing and supplying the modulation signal and the control voltage to said second and third variable capacitance diodes.
Claim 27
Dependent Claim
29 words
An oscillator according to claim 23, wherein said resonant circuit is a parallel resonant circuit and said first series circuit is connected in parallel with said parallel resonant circuit.
Claim 28
Dependent Claim
31 words
An oscillator according to claim 23, wherein said resonant circuit is a series circuit and said first series circuit is connected in series with an inductance of said series resonant circuit.
Claim 29
Dependent Claim
48 words
An oscillator according to claim 23, wherein said resonant circuit is a series resonant circuit, said second series circuit is connected in series with an inductance of said series resonant circuit, and said first series circuit is connected in parallel with said inductance and said second series circuit.
Claim 30
Dependent Claim
38 words
An oscillator according to claim 24, wherein said second series circuit is connected in parallel with said parallel resonant circuit and said third series circuit is connected in parallel with said first capacitor of said first series circuit.
Claim 31
Dependent Claim
46 words
An oscillator according to claim 24 or 25, wherein said second series circuit is connected in parallel with said first capacitor of said first series circuit and said third series circuit is connected in parallel with said first variable capacitance diode of said first series circuit.
Claim 32
Dependent Claim
38 words
An oscillator according to claim 25, wherein said second series circuit is connected in parallel with said first capacitor of said first series circuit and said third series circuit is connected in parallel with said first series circuit.
Claim 33
Dependent Claim
48 words
An oscillator according to claim 25, wherein said second series circuit is connected in parallel with said first variable capacitance diode of said first series circuit and said third series circuit is connected in parallel with said inductance of said series resonant circuit and said first series circuit.
Claim 34
Dependent Claim
42 words
An oscillator according to claim 25, wherein said second series circuit is connected in parallel with said first series circuit and said third series circuit is connected in parallel with said inductance of said series resonant circuit and said first series circuit.
Claim 35
Dependent Claim
25 words
An oscillator according to claim 26, wherein said third series circuit is connected in parallel with said first variable diode of said first series circuit.
Claim 36
Dependent Claim
28 words
An oscillator according to claim 26, wherein said third series circuit is connected in parallel with said inductance of said series resonant circuit and said second series circuit.
References Cited (Backward Citations)
US4503402A
Cited
US4684904A
Cited
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| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
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| 3.5 Years (Year 4) | 1992-01-31 | 1992-08-01 | 1993-01-31 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1996-01-31 | 1996-08-01 | 1997-01-31 | $3760.00 | Window Closed / Lapsed |
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