Phase locked loop modulator calibration techniques
First Claim
Patent Images
1. A method for calibrating a phase locked loop, the method comprises:
- performing an open loop calibration of a voltage controlled oscillator to produce an open loop calibrated voltage controlled oscillator;
determining a gain offset of the open loop calibrated voltage controlled oscillator of the phase locked loop; and
adjusting current of a charge pump of the phase locked loop based on the gain offset.
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Abstract
A method for calibrating a phase locked loop begins by determining a gain offset of a voltage controlled oscillator of the phase locked loop. The processing then continues by adjusting current of a charge pump of the phase locked loop based on the gain offset.
60 Citations
20 Claims
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1. A method for calibrating a phase locked loop, the method comprises:
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performing an open loop calibration of a voltage controlled oscillator to produce an open loop calibrated voltage controlled oscillator; determining a gain offset of the open loop calibrated voltage controlled oscillator of the phase locked loop; and adjusting current of a charge pump of the phase locked loop based on the gain offset. - View Dependent Claims (2, 3, 4, 5, 6)
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7. An auto-calibrating phase locked loop comprises:
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phase and frequency detection module operably coupled to produce an up signal when at least one of phase and frequency of a reference oscillation leads at least one of phase and frequency of a feedback oscillation and to produce a down signal when the at least one of phase and frequency of the feedback oscillation leads the at least one of phase and frequency of the reference oscillation; charge pump circuit operably coupled to convert the up signal and down signal into a current signal; loop filter operably coupled to convert the current signal into a control voltage; voltage controlled oscillator operably coupled to convert the control voltage into an output oscillation, wherein the feedback oscillation is derived from the output oscillation; and calibration module operably coupled to; perform an open loop calibration of the voltage controlled oscillator to produce an open loop calibrated voltage controlled oscillator; determine a gain offset of the open loop calibrated voltage controlled oscillator; and adjust at least one dependent current source of the charge pump based on the gain offset. - View Dependent Claims (8, 9, 10, 11, 12, 13)
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14. A radio transmitter comprises:
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phase and frequency detection module operably coupled to produce an up signal when at least one of phase and frequency of an input modulated signal leads at least one of phase and frequency of a feedback oscillation and to produce a down signal when the at least one of phase and frequency of the feedback oscillation leads the at least one of phase and frequency of the input modulated signal; charge pump circuit operably coupled to convert the up signal and down signal into a current signal; loop filter operably coupled to convert the current signal into a control voltage; voltage controlled oscillator operably coupled to convert the control voltage into a radio frequency oscillation, wherein the feedback oscillation is derived from the radio frequency oscillation; and calibration module operably coupled to; perform an open loop calibration of the voltage controlled oscillator to produce an open loop calibrated voltage controlled oscillator; determine a gain offset of the open loop calibrated voltage controlled oscillator; and adjust at least one dependent current source of the charge pump based on the gain offset. - View Dependent Claims (15, 16, 17, 18, 19, 20)
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Specification