US5075644A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Voltage controlled oscillator with filtered and compensated modulation
Assignee: Motorola Solutions Inc
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Filing: 1990-12-03
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Granted: 1991-12-24
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Expires: 2010-12-03
Abstract
Abstract Briefly, according to the invention, a voltage controlled oscillator 200 having a control input, an information signal input, and an output is disclosed. The voltage controlled oscillator 200 comprises a tank circuit 202 for generating a carrier signal and a modulator 206 for modulating the carrier signal in response to the information signal 210 at the information signal input of the voltage controlled oscillator 200. The voltage controlled oscillator 200 includes a filter 208 coupling the modulator 206 to the tank circuit 202 for rejecting out of band signals from altering the bias point of the modulator 206.
Inventors
- 👤 Clarke J. Calvin
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-06 10:39
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/22; H03C3/225; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1228; H03B5/1237; H03B5/124; H03B5/1243; H03C3/02; H03B2200/00; H03B2200/003; H03B2200/004; H03B2200/006; H03B2200/0062; H03C2200/00; H03C2200/0037; H03C2200/005
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
73 words
A voltage controlled oscillator having a control input, an information signal input and an output, comprising: generator means for generating a carrier signal; modulator means coupled to the generator means for modulating the carrier signal responsive to an information signal on the information signal input, the modulator means having a modulation sensitivity; and filter means for coupling the modulator means to the generator means for preventing harmonic resonance interactions affecting the modulation sensitivity.
Claim 2
Dependent Claim
73 words
A voltage controlled oscillator having a control input, an information signal input and an output, comprising: generator means for generating a carrier signal; modulator means coupled to the generator means for modulating the carrier signal responsive to an information signal on the information signal input, the modulator means having a modulation sensitivity; and filter means for coupling the modulator means to the generator means for preventing harmonic resonance interactions affecting the modulation sensitivity.
Claim 3
Dependent Claim
14 words
The VCO of claim 1, wherein the filter means comprises a low pass filter.
Claim 4
Dependent Claim
15 words
The VCO of claim 2, wherein the low pass filter comprises a series LC filter.
Claim 5
Dependent Claim
13 words
The VCO of claim 1, wherein said generator means comprises a tank circuit.
Claim 6
Dependent Claim
12 words
The VCO of claim 4, wherein said tank circuit includes a varactor.
Claim 7
Dependent Claim
12 words
The VCO of claim 1, wherein said modulator means comprises a varactor.
Claim 8
Dependent Claim
76 words
A modulation device having an input and an output, comprising: VCO means for generating a carrier signal modulated with an information signal available at the input of the modulation device, said VCO means including: first means for producing the carrier signal; second means for modulating the carrier signal, the second means having a modulation sensitivity; and filter means for coupling the first means to the second means for preventing harmonic resonance interactions affecting the modulation sensitivity.
Claim 9
Dependent Claim
76 words
A modulation device having an input and an output, comprising: VCO means for generating a carrier signal modulated with an information signal available at the input of the modulation device, said VCO means including: first means for producing the carrier signal; second means for modulating the carrier signal, the second means having a modulation sensitivity; and filter means for coupling the first means to the second means for preventing harmonic resonance interactions affecting the modulation sensitivity.
Claim 10
Dependent Claim
14 words
The modulation device of claim 7, wherein said first means comprises a tank circuit.
Claim 11
Dependent Claim
13 words
The modulation device of claim 8, wherein said tank circuit includes a varactor.
Claim 12
Dependent Claim
13 words
The modulation device of claim 7, wherein said second means comprises a varactor.
Claim 13
Dependent Claim
15 words
The modulation device of claim 7, wherein said filter means comprises a low pass filter.
Claim 14
Dependent Claim
51 words
A voltage controlled oscillator, comprising: a tank circuit including at least one tuning varactor; an oscillation amplifier coupled to the tank circuit; a modulation varactor coupled to the tank circuit; and a filter coupling the modulation varactor to the tank circuit for minimizing interference within the harmonic bands of the VCO.
Claim 15
Dependent Claim
51 words
A voltage controlled oscillator, comprising: a tank circuit including at least one tuning varactor; an oscillation amplifier coupled to the tank circuit; a modulation varactor coupled to the tank circuit; and a filter coupling the modulation varactor to the tank circuit for minimizing interference within the harmonic bands of the VCO.
Claim 16
Dependent Claim
14 words
The voltage controlled oscillator of claim 12, wherein said filter comprises a bandpass filter.
Claim 17
Dependent Claim
15 words
The voltage controlled oscillator of claim 12, wherein said filter comprises a low pass filter.
Claim 18
Dependent Claim
66 words
A communication device, comprising: means for transmitting a communication signal, including a voltage controlled oscillator, said voltage controlled oscillator comprising: a tank circuit including a tuning varactor; a modulation varactor coupled to the tank circuit; an oscillation amplifier coupled to the tank circuit; and a filter coupling the modulation varactor to the tank circuit for minimizing interference within the harmonic bands of the voltage controlled oscillator.
Claim 19
Dependent Claim
66 words
A communication device, comprising: means for transmitting a communication signal, including a voltage controlled oscillator, said voltage controlled oscillator comprising: a tank circuit including a tuning varactor; a modulation varactor coupled to the tank circuit; an oscillation amplifier coupled to the tank circuit; and a filter coupling the modulation varactor to the tank circuit for minimizing interference within the harmonic bands of the voltage controlled oscillator.
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) | 1994-12-23 | 1995-06-24 | 1995-12-24 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1998-12-23 | 1999-06-24 | 1999-12-24 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2002-12-23 | 2003-06-24 | 2003-12-24 | $7700.00 | Window Closed / Lapsed |