Patent US5576667A successfully refreshed from Google Patents.
US5576667A
Expired / Lapsed
US
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Voltage control type oscillator
Assignee: Murata Manufacturing Co Ltd
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Filing: 1995-11-21
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Granted: 1996-11-19
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Expires: 2015-11-21
Abstract
Abstract An inexpensive voltage control type oscillator suitable for use with a mobile radio communication system within a predetermined frequency band range. The oscillator includes a resonance circuit and an oscillation stage formed on a printed wiring board and operating such that the oscillation frequency of the oscillation stage is varied within a predetermined frequency band range by varying the resonance frequency of a parallel resonance circuit included in the oscillation stage on the basis of a control voltage. The parallel circuit comprises a strip line connected in series with a bias resistor and a chip capacitor connected parallel to the strip line. The strip line has an inductance sufficiently larger than that of the resistor and the chip capacitor has a capacitance value so determined that the capacitor resonates at a predetermined frequency in cooperation with the strip line.
Inventors
- 👤 Shinji Goma
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 22:44
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/18; H03B5/08; H03B5/12; H03B5/1231; H03B5/1206; H03B5/1221; H03B5/1237; H03B5/124; H03B5/1243; H03B2200/00; H03B2200/003; H03B2200/0034; H03B2200/006; H03B2200/0086; H03B2200/0088; H03B2201/00; H03B2201/02; H03B2201/0208; H03B2202/00; H03B2202/05; H03B5/1841; H03B5/1847
Claims Analysis
Total Claims: 18
Claim 1
Independent Claim
159 words
A voltage control type oscillator comprising: a resonance circuit including a parallel resonance circuit; and an oscillation stage wherein an oscillation frequency of said oscillation stage varies within a predetermined frequency band by varying a resonance frequency of the parallel resonance circuit of said resonance circuit on the basis of an inputted control voltage, said oscillation stage including: an active element having a current output terminal and adapted to compensate for a power loss in said parallel resonance circuit; a bias resistor for regulating the DC bias of the current output terminal of said active element; a strip line connected in series with said bias resistor, said strip line having an inductance larger than that of said bias resistor within a predetermined frequency band; and a chip capacitor which is connected in parallel to said strip line and whose capacitance value is determined so that said chip capacitor resonates at a predetermined frequency in cooperation with said strip line.
Claim 2
Dependent Claim
159 words
A voltage control type oscillator comprising: a resonance circuit including a parallel resonance circuit; and an oscillation stage wherein an oscillation frequency of said oscillation stage varies within a predetermined frequency band by varying a resonance frequency of the parallel resonance circuit of said resonance circuit on the basis of an inputted control voltage, said oscillation stage including: an active element having a current output terminal and adapted to compensate for a power loss in said parallel resonance circuit; a bias resistor for regulating the DC bias of the current output terminal of said active element; a strip line connected in series with said bias resistor, said strip line having an inductance larger than that of said bias resistor within a predetermined frequency band; and a chip capacitor which is connected in parallel to said strip line and whose capacitance value is determined so that said chip capacitor resonates at a predetermined frequency in cooperation with said strip line.
Claim 3
Dependent Claim
31 words
A voltage control type oscillator according to claim 1, wherein said oscillation stage is formed on a printed wiring board having wirings and said strip line is one of said wirings.
Claim 4
Dependent Claim
25 words
A voltage control type oscillator according to claim 1, wherein said strip line has an inductance of approximately 66 nH in a 900 MHz band.
Claim 5
Dependent Claim
25 words
A voltage control type oscillator according to claim 1, wherein said strip line and said chip capacitor are interposed between the bias resistor and ground.
Claim 6
Dependent Claim
27 words
A voltage control type oscillator according to claim 1, wherein said strip line and said chip capacitor are interposed between said active element and the bias resistor.
Claim 7
Dependent Claim
16 words
A voltage control type oscillator according to claim 1, wherein said active element is a transistor.
Claim 8
Dependent Claim
27 words
A voltage control type oscillator according to claim 1, wherein said strip line has the shape of one of a zigzag, a straight line and combination thereof.
Claim 9
Dependent Claim
36 words
A voltage control type oscillator according to claim 1, wherein said strip line has a length of 15 mm and an inductance of 66 nH and said chip capacitor has a capacitance value of 3 pF.
Claim 10
Dependent Claim
56 words
A voltage control type oscillator according to claim 1, wherein said strip line and said chip capacitor form a parallel resonance circuit, a length of the strip line and a capacitance value of the chip capacitor are determined so that said parallel resonance circuit is held open in an AC mode within said predetermined band range.
Claim 11
Dependent Claim
21 words
A voltage control type oscillator according to claim 1, wherein said predetermined band range is in the 900 MHz frequency band.
Claim 12
Dependent Claim
31 words
A voltage control type oscillator according to claim 1, wherein a resonance frequency of said resonance circuit varies depending on a control voltage to be impressed upon the control terminal thereof.
Claim 13
Dependent Claim
17 words
A voltage control type oscillator according to claim 1, wherein said oscillation stage is a Colpitts oscillator.
Claim 14
Dependent Claim
20 words
A voltage control type oscillator according to claim 1, wherein said oscillation stage further comprises a high frequency bypass capacitor.
Claim 15
Dependent Claim
23 words
A voltage control type oscillator according to claim 1, wherein said oscillation stage is connected to the resonance circuit through a coupling capacitor.
Claim 16
Dependent Claim
28 words
A voltage control type oscillator according to claim 1, wherein said resonance circuit comprises a coupling capacitor, a variable capacitance diode, a resonance inductor and a resonance capacitor.
Claim 17
Dependent Claim
40 words
A voltage control type oscillator according to claim 1, further comprising a buffer stage which amplifies a signal outputted from the oscillator stage and which prevents the variation of the oscillation frequency of the oscillation stage by a load variation.
Claim 18
Dependent Claim
33 words
A voltage control type oscillator according to claim 1, further comprising an output matching stage which matches a next stage circuit to be connected to an output terminal thereof and inhibits higher harmonics.
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1999-11-19 | 2000-05-20 | 2000-11-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2003-11-19 | 2004-05-20 | 2004-11-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2007-11-19 | 2008-05-20 | 2008-11-19 | $7700.00 | Window Closed / Lapsed |