Variable rate digital controller for a frequency synthesizer
First Claim
1. A variable rate digital controller for a frequency synthesizer which is responsive to digital signals for controlling its frequency, comprising:
- rate indicating means for periodically generating a digital signal from among a plurality of such digital signals representative of various tuning rates;
rate decoding means for receiving the digital signals and providing in response thereto digital control words, with each word being associated with at least one of the digital signals;
digital counting means having a plurality of counting rates, with each rate being determined by a different one of the control words applied thereto, andmeans for applying the digital count of said digital counting means to the frequency synthesizer to control its frequency.
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Abstract
Variable rate digital control of a frequency synthesizer is afforded by periodically generating a digital signal from among a plurality of such digital signals representative of various tuning rates, converting each digital signal to a digital control word through a rate decoding means in which each control word is associated with at least one of the digital signals, applying the control words to a digital counting means having a plurality of counting rates, with each rate being determined by a different one of the control words, and applying the digital count of the digital counting means to the frequency synthesizer to control its frequency.
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Citations
13 Claims
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1. A variable rate digital controller for a frequency synthesizer which is responsive to digital signals for controlling its frequency, comprising:
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rate indicating means for periodically generating a digital signal from among a plurality of such digital signals representative of various tuning rates; rate decoding means for receiving the digital signals and providing in response thereto digital control words, with each word being associated with at least one of the digital signals; digital counting means having a plurality of counting rates, with each rate being determined by a different one of the control words applied thereto, and means for applying the digital count of said digital counting means to the frequency synthesizer to control its frequency. - View Dependent Claims (2, 3, 4, 5, 6)
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7. A method for digitally controlling a frequency synthesizer whose frequency is determined by digital signals applied thereto, comprising:
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periodicaly generating a digital signal from among a plurality of such digital signals representative of various tuning rates; converting each digital signal to a digital control word with each control word being associated with at least one of the digital signals; digitally counting at a rate determined by the control words, there being a different rate associated with each one of the control words, and applying the digital count to the synthesizer to control its frequency. - View Dependent Claims (8, 9)
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10. A variable rate digitally controlled frequency synthesizer, comprising:
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a frequency synthesizer whose frequency is determined by digital signals applied thereto; rate indicating means for periodically generating a digital signal from among a plurality of such digital signals representative of various tuning rates; rate decoding means for receiving the digital signals and providing in response thereto digital control words, with each word being associated with at least one of the digital signals; digital counting means having a plurality of counting rates, with each rate being determined by a different one of the control words applied thereto, and means for applying the digital count of said digital counting means to the frequency synthesizer to control its frequency. - View Dependent Claims (11, 12, 13)
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Specification