Calibration and/or adjusting gain associated with voltage-controlled oscillator
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 computing gain adjustment parameters associated with a voltage-controlled oscillator, the method comprising:
- obtaining gain measurements corresponding to output frequencies of a voltage-controlled oscillator;
- computing threshold values for dividing a gain curve associated with the voltage-controlled oscillator into sections that are roughly linear;
- computing gain adjustment model parameters including a slope and an offset corresponding to each of the sections of the gain curve associated with the voltage-controlled oscillator;
- storing the gain adjustment model parameters to memory;
- and
- adjusting a gain associated with a phase-locked loop that includes the voltage-controlled oscillator based on the gain adjustment parameters.
A wireless communication device comprising:
- an antenna configured to transmit a radio frequency signal;
- and
- a transceiver configured to generate the radio frequency signal, the transceiver including a phase-locked loop that includes a voltage-controlled oscillator, a charge pump, and a charge pump controller configured to select a slope of a plurality of slopes of a gain correction curve associated with the voltage-controlled oscillator that are stored in memory and to compute a charge pump control value for the charge pump using the slope.
A charge pump controller comprising:
- a memory configured to store gain adjustment model parameters including slopes of a gain correction curve associated with an electronic oscillator;
- a model selector configured to generate a model select indicator based on a comparison of an indicator of gain of the electronic oscillator with a threshold value, the model select indicator corresponding to a selected slope of the slopes of the gain adjustment model parameters stored in the memory;
- and
- a charge pump control calculator coupled to the model selector and configured to compute a charge pump control value for a charge pump using the selected slope.
Dependencies are inferred from the claim text.