Adjusting voltage controlled oscillator gain
AssigneeSkyworks Solutions, Inc.
InventorsThomas Obkircher, Bipul Agarwal, Wei-Hong Chen
Life of this patent
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Abstract
Apparatus and methods for adjusting a gain of an electronic oscillator, such as a voltage-controlled oscillator (VCO), are disclosed. In one aspect, an apparatus for compensating for VCO gain variations includes a charge pump controller. The charge pump controller can be configured to select a VCO gain model based on a comparison of a VCO gain indicator and a threshold value stored in a memory, obtain VCO gain model parameters from the memory corresponding to the selected VCO gain model, and compute a charge pump current control value using the VCO gain model parameters. The charge pump current control value can be used to compensate for VCO gain variations.
Claims20
A method of adjusting a gain associated with a voltage-controlled oscillator, the method comprising:
- obtaining, from a memory, a selected slope of a plurality of slopes and a selected offset of a plurality of offsets based on an indicator of an output frequency of the voltage-controlled oscillator;
- computing a charge pump control value using the selected slope and the selected offset;
- and
- using the charge pump control value, adjusting the gain associated the voltage-controlled oscillator with a charge pump.
A method of adjusting a gain associated with a voltage-controlled oscillator, the method comprising:
- comparing an indicator of an output frequency of the voltage-controlled oscillator with a threshold value;
- obtaining, from a memory, a slope and an offset based on said comparing, the memory including a slope lookup table storing the slope, an offset lookup table storing the offset, and a threshold lookup table storing the threshold value;
- computing a charge pump control value using the slope and the offset;
- and
- using the charge pump control value, adjusting the gain associated the voltage-controlled oscillator with a charge pump.
A circuit comprising:
- a voltage-controlled oscillator having an output frequency;
- a charge pump controller configured to obtain, from a memory, a selected slope of a plurality of slopes associated with the voltage-controlled oscillator based on an indicator of the output frequency, and to compute a charge pump control value using the selected slope;
- and
- a charge pump configured to adjust a gain associated with the voltage-controlled oscillator based on the charge pump control value.
An electronic system comprising:
- voltage-controlled oscillators of which a selected voltage-controlled oscillator provides a voltage-controlled oscillator output to a closed loop of a phase-locked loop;
- a charge pump configured to adjust a gain of the phase-locked loop based on a charge pump control value;
- and
- a charge pump controller configured to obtain a selected offset of a plurality of offsets associated with the selected voltage-controlled oscillator based on an indicator of a frequency of the voltage-controlled oscillator output and an indicator of the selected voltage-controlled oscillator, the charge pump controller configured to obtain a selected slope of a plurality of slopes associated with the selected voltage-controlled oscillator based on the indicator of the output frequency of the selected voltage-controlled oscillator and the indicator of the selected voltage-controlled oscillator, and the charge pump controller configured to compute the charge pump control value using the selected offset and the selected slope.
Dependencies are inferred from the claim text.