US5144264A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Wideband voltage controlled oscillator having open loop gain compensation
Assignee: Motorola Solutions Inc
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Filing: 1991-11-01
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Granted: 1992-09-01
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Expires: 2011-11-01
Abstract
Abstract A voltage control oscillator (400) includes a tank circuit (402) wihch includes a control input (118). The VCO (400) further includes a feedback section (106) which includes a transistor (108). The feedback circuit (106) further includes a feedback compensation circuit 420 which compensates the feedback ratio of the feedback circuit (106) over changes in frequency of operation in order to provide for a substantially constant open loop gain. The improved VCO (400) provides for fairly constant current drain over changes in frequency as well as lower power output variations and flatter Side Band Noise Ratio response over frequency.
Inventors
- 👤 Thomas C. K. Chong
- 👤 Prakash Chacko
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 14:21
CPC Classifications
H; H03; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1231; H03B5/1203; H03B5/1237; H03B5/124; H03B5/1243; H03B5/1293; H03B2200/00; H03B2200/0002; H03B2200/0006; H03B2200/0008; H03B2200/0012; H03B2200/003; H03B2200/004; H03B2201/00; H03B2201/02; H03B2201/0208
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
76 words
A voltage controlled oscillator for operating within a predetermined operating frequency range, comprising: an active element; and feedback means coupled to the active element for providing feedback to the active element, the feedback means including a feedback compensation means for decreasing the feedback ratio (β) of the feedback means as the operating frequency of the voltage controlled oscillator is increased and for providing for a substantially constant open loop gain over the predetermined operating frequency range.
Claim 2
Dependent Claim
76 words
A voltage controlled oscillator for operating within a predetermined operating frequency range, comprising: an active element; and feedback means coupled to the active element for providing feedback to the active element, the feedback means including a feedback compensation means for decreasing the feedback ratio (β) of the feedback means as the operating frequency of the voltage controlled oscillator is increased and for providing for a substantially constant open loop gain over the predetermined operating frequency range.
Claim 3
Dependent Claim
29 words
The voltage controlled oscillator of claim 1, wherein the feedback compensation means includes a reactive circuit which increases capacitance as the operating frequency of the voltage controlled oscillator increases.
Claim 4
Dependent Claim
20 words
The voltage controlled oscillator of claim 1, wherein the feedback compensation means comprises an inductor and capacitor coupled in series.
Claim 5
Dependent Claim
17 words
The voltage controlled oscillator of claim 3, wherein the voltage controlled oscillator is a Colpitts voltage-controlled oscillator.
Claim 6
Dependent Claim
93 words
A Colpitts voltage-controlled oscillator for operating in a predetermined operating frequency range, comprising: a transistor having a control terminal and first and second terminals; and feedback means coupled between the second terminal and the control terminal of the transistor, the feedback means providing feedback to the transistor, said feedback means including a feedback compensation means for decreasing the feedback ratio (β) of the feedback means as the operating frequency is increased within the predetermined operating frequency range and for providing for a substantially constant open loop gain over the predetermined operating frequency range.
Claim 7
Dependent Claim
93 words
A Colpitts voltage-controlled oscillator for operating in a predetermined operating frequency range, comprising: a transistor having a control terminal and first and second terminals; and feedback means coupled between the second terminal and the control terminal of the transistor, the feedback means providing feedback to the transistor, said feedback means including a feedback compensation means for decreasing the feedback ratio (β) of the feedback means as the operating frequency is increased within the predetermined operating frequency range and for providing for a substantially constant open loop gain over the predetermined operating frequency range.
Claim 8
Dependent Claim
20 words
The Colpitts voltage controlled oscillator of claim 5, wherein the feedback compensation means includes a series coupled inductor and capacitor.
Claim 9
Dependent Claim
24 words
The Colpitts voltage-controlled oscillator of claim 5, wherein the feedback compensation means increases capacitance as the operating frequency of the Colpitts voltage-controlled oscillator increases.
Claim 10
Dependent Claim
85 words
A communication device comprising: a receiver section; and a voltage controlled oscillator for operating in a predetermined operating frequency range, including: an active element; and feedback means coupled to the active element for providing feedback to the active element, the feedback means including a feedback compensation means for decreasing the feedback ratio (β) of the feedback means as the operating frequency is increased within the predetermined operating frequency range and for providing for a substantially constant open loop gain over the predetermined operating frequency range.
Claim 11
Dependent Claim
85 words
A communication device comprising: a receiver section; and a voltage controlled oscillator for operating in a predetermined operating frequency range, including: an active element; and feedback means coupled to the active element for providing feedback to the active element, the feedback means including a feedback compensation means for decreasing the feedback ratio (β) of the feedback means as the operating frequency is increased within the predetermined operating frequency range and for providing for a substantially constant open loop gain over the predetermined operating frequency range.
Claim 12
Dependent Claim
15 words
The communication device of claim 8, wherein the feedback compensation means includes a reactive circuit.
Claim 13
Dependent Claim
19 words
The communication device of claim 8, wherein the feedback compensation means comprises an inductor and capacitor coupled in series.
Claim 14
Dependent Claim
19 words
The communication device of claim 8, wherein the feedback compensation means comprises an inductor and capacitor coupled in parallel.
Claim 15
Dependent Claim
16 words
The communication device of claim 10, wherein the voltage controlled oscillator is a Colpitts voltage-controlled oscillator.
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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) | 1995-09-01 | 1996-03-02 | 1996-09-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1999-09-01 | 2000-03-02 | 2000-09-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2003-09-01 | 2004-03-02 | 2004-09-01 | $7700.00 | Window Closed / Lapsed |