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US 2008/0074201 A1Published application
Frequency synthesizer and method
AssigneeInfineon Technologies AG
InventorsStephan Henzler, Siegmar Koppe
Life of this patent
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Abstract
A synthesizer arrangement includes an oscillator, a phase detector, and a loop filter that form a phase-locked loop. The loop filter is coupled to a control unit to activate a respective set of internal states out of a plurality of sets of internal states.
Claims29
A frequency synthesizer, comprising:
- a digitally controlled oscillator, comprising an input and an output;
- a detector comprising an input coupled to the output of the digitally controlled oscillator, and another input configured to receive a reference signal, and an output;
- a loop filter coupled between the output of the detector and the input of the digitally controlled oscillator;
- and
- a memory unit operably coupled to the loop filter and configured to save internal states of the loop filter.
2 more elements
A phase-locked loop, comprising:
- a comparator configured to compare a reference input and a feedback input and generate a comparison result at an output;
- a loop filter configured to process the comparison result and generate a control signal at an output thereof;
- an oscillator comprising a control input coupled to the loop filter output and an output coupled to the feedback input of the comparator and configured to generate an oscillator signal based on the control signal at the control input;
- wherein the loop filter has a plurality of sets of internal states associated therewith, wherein one of the sets of internal states is selectively activated during operation of the phase-locked loop to produce a desired frequency.
1 more element
A frequency-hopping synthesizer, comprising:
- a controllable oscillator, a phase detector and a loop filter that are coupled together to form a phase-locked loop;
- and
- a control unit configured to activate a respective set of internal states out of a plurality of sets of internal states within the loop filter.
A method of initializing a phase-locked loop, comprising:
- configuring the phase-locked loop to provide a frequency;
- activating the phase-locked loop;
- and
- writing a set of internal states of the phase-locked loop corresponding to the frequency into a memory when the phase-locked loop has locked onto the frequency.
1 more element
A method of frequency-hopping in a frequency synthesizer comprising a loop filter, the method comprising:
- saving in a memory a first set of internal states of the loop filter corresponding to a first operating frequency of the frequency synthesizer;
- and
- loading a second set of internal states into the loop filter from the memory, the set of internal states of the loop filter corresponding to a second operating frequency of the frequency synthesizer.
Dependencies are inferred from the claim text.