Systems and methods for minimizing spurs through duty cycle adjustment
AssigneeQUALCOMM Incorporated
InventorsJustin A. HWANG, David SU
Life of this patent
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Abstract
A frequency source, such as for a wireless communications device, configured to have a duty cycle adjustment. A selected harmonic spur resulting from operation of the frequency source at one duty cycle may be avoided or minimized by operating the frequency source at a second duty cycle. Determination of the appropriate duty cycle may be based on measuring the amplitude of the harmonic spur as it appears in the output of a receive chain of the wireless device. Alternatively, the duty cycle may be set to desired value to avoid or minimize a given harmonic.
Claims26
A method for reducing a harmonic spur comprising:
- operating a frequency source at a first duty cycle such that the harmonic spur has a first amplitude at the first duty cycle;
- and
- operating the frequency source at a second duty cycle, such that the harmonic spur has a second amplitude at the second duty cycle, wherein the second amplitude is less than the first amplitude.
A frequency source comprising a duty cycle module, wherein when operation of the frequency source at a first duty cycle generates a harmonic spur having a first amplitude, the duty cycle module is configured to operate the frequency source at a second duty cycle, such that the harmonic spur has a second amplitude at the second duty cycle, wherein the second amplitude is less than the first amplitude.
A method of operating a wireless communications device, comprising:
- operating a frequency source, wherein energy from the frequency source couples to a receive chain of the wireless communications device to generate a harmonic spur having a first amplitude when the frequency source operates at a first duty cycle;
- and
- operating the frequency source at a second duty cycle, such that the harmonic spur has a second amplitude at the second duty cycle, wherein the second amplitude is less than the first amplitude.
A wireless communications device comprising:
- a receive chain;
- a frequency source;
- and a
- a duty cycle module,
- wherein operation of the frequency source at a first duty cycle generates a harmonic spur that couples to the receive chain having a first amplitude at the first duty cycle and wherein the duty cycle module is configured to operate the frequency source at a second duty cycle, such that the harmonic spur has a second amplitude at the second duty cycle and the second amplitude is less than the first amplitude.
Dependencies are inferred from the claim text.