Frequency modulator
AssigneeMotorola, Inc.
InventorStephen B. Einbinder
Life of this patent
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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).
Claims15
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.
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.
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.
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.
Dependencies are inferred from the claim text.