US5075643A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Frequency modulator
Assignee: Motorola Solutions Inc
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Filing: 1990-12-24
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Granted: 1991-12-24
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Expires: 2010-12-24
Abstract
Abstract An improved frequency modulation apparatus (100) is provided comprising a generator (102), a biasing voltage line (116), and an interface circuit (110). The generator (102) is utilized to generate a carrier signal. A control line input (104) on the generator (102) adjusts the frequency of the carrier signal. The biasing voltage line (116) provides DC power in order to DC bias the generator (102). The interface circuit (110) couples an information signal (114) to the biasing voltage line (116) for altering the biasing of the generator (102) in response to the information signal (114). The alteration of the biasing of the generator (102) results in the carrier signal being frequency modulated by the information signal (114).
Inventors
- 👤 Stephen B. Einbinder
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-28 06:46
CPC Classifications
H; H03; H03C; H03C3/00; H03C3/10; H03C3/12; H03C3/22; H03C3/222; H03B; H03B5/00; H03B5/08; H03B5/12; H03B5/1203; H03B5/1231; H03B5/1237; H03B5/124; H03B5/1243; H03B2200/00; H03B2200/0002; H03B2200/0008; H03B2200/001; H03B2200/003; H03B2200/004; H03B2200/006; H03B2200/0086; H03B2201/00; H03B2201/02; H03B2201/0208
Claims Analysis
Total Claims: 19
Claim 1
Independent Claim
85 words
An apparatus for generating a carrier signal modulated with an information signal, comprising: voltage controlled oscillator (VCO) means for generating the carrier signal, the VCO means having a control means for controlling the frequency of the carrier signal; DC power supply means for providing power to the VCO means; and interface means for interfacing the information signal to the DC power supply means for altering the supply power of the VCO in response to the information signal to effect the modulation of the carrier signal.
Claim 2
Independent Claim
85 words
An apparatus for generating a carrier signal modulated with an information signal, comprising: voltage controlled oscillator (VCO) means for generating the carrier signal, the VCO means having a control means for controlling the frequency of the carrier signal; DC power supply means for providing power to the VCO means; and interface means for interfacing the information signal to the DC power supply means for altering the supply power of the VCO in response to the information signal to effect the modulation of the carrier signal.
Claim 3
Dependent Claim
13 words
The apparatus of claim 1, wherein the VCO means comprises a Colpitts oscillator.
Claim 4
Dependent Claim
13 words
The apparatus of claim 1, wherein the VCO means comprises a Hartley oscillator.
Claim 5
Dependent Claim
13 words
The apparatus of claim 1, wherein the interface means comprises a summing circuit.
Claim 6
Dependent Claim
16 words
The apparatus of claim 4, wherein the summing circuit includes means for coupling the information signal.
Claim 7
Dependent Claim
13 words
The apparatus of claim 5, wherein the coupling means comprises a buffer circuit.
Claim 8
Dependent Claim
15 words
The apparatus of claim 4, wherein the summing circuit comprises a field effect transistor (FET).
Claim 9
Dependent Claim
14 words
The apparatus of claim 4, wherein the summing circuit comprises a bipolar transistor (BPT).
Claim 10
Dependent Claim
71 words
A frequency modulation apparatus, comprising: generator means for generating a carrier signal, the generator means having a control line for setting the frequency of the carrier signal; power supply means providing a DC voltage for powering the generator means; and interface means coupling an information signal to the power supply means for modulating the carrier signal by varying the biasing level of the generator means in response to the information signal.
Claim 11
Dependent Claim
71 words
A frequency modulation apparatus, comprising: generator means for generating a carrier signal, the generator means having a control line for setting the frequency of the carrier signal; power supply means providing a DC voltage for powering the generator means; and interface means coupling an information signal to the power supply means for modulating the carrier signal by varying the biasing level of the generator means in response to the information signal.
Claim 12
Dependent Claim
19 words
The frequency modulation apparatus of claim 9, wherein the biasing means comprises a DC voltage generated by a battery.
Claim 13
Dependent Claim
15 words
The frequency modulation apparatus of claim 9, wherein the interface means comprises a summer means.
Claim 14
Dependent Claim
15 words
The frequency modulation apparatus of claim 11, wherein the summer means comprises an operational amplifier.
Claim 15
Dependent Claim
70 words
A frequency modulation apparatus for modulating a carrier signal generated by an oscillator with an information signal, the oscillator having a control line for setting the frequency of the carrier signal, the apparatus comprising: means for supplying a DC power supply signal to the oscillator; and means for summing the information signal to the DC power supply signal for effecting the modulation of the carrier signal by the information signal.
Claim 16
Dependent Claim
70 words
A frequency modulation apparatus for modulating a carrier signal generated by an oscillator with an information signal, the oscillator having a control line for setting the frequency of the carrier signal, the apparatus comprising: means for supplying a DC power supply signal to the oscillator; and means for summing the information signal to the DC power supply signal for effecting the modulation of the carrier signal by the information signal.
Claim 17
Dependent Claim
16 words
The frequency modulation apparatus of claim 13, wherein the means for summing comprises an operational amplifier.
Claim 18
Dependent Claim
86 words
A communication device, comprising: means for transmitting a communication signal, including a frequency modulation apparatus, the frequency modulation apparatus comprising: generator means for generating a carrier signal the generator means having a control line for setting the frequency of the carrier signal; power supply means providing a DC voltage for powering the generator means; and interface means coupling an information signal to the power supply means for modulating the carrier signal by varying the biasing level of the generator means in response to the information signal.
Claim 19
Dependent Claim
86 words
A communication device, comprising: means for transmitting a communication signal, including a frequency modulation apparatus, the frequency modulation apparatus comprising: generator means for generating a carrier signal the generator means having a control line for setting the frequency of the carrier signal; power supply means providing a DC voltage for powering the generator means; and interface means coupling an information signal to the power supply means for modulating the carrier signal by varying the biasing level of the generator means in response to the information 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) | 1994-12-23 | 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 |