VCO gain tracking for modulation gain setting calibration
First Claim
1. A system for calibrating mobile station modulation gain settings, comprising:
- a synthesizer including a phase locked loop (PLL), the PLL for outputting a tuning voltage for controlling a frequency of a voltage controlled oscillator (VCO) modulated signal; and
a controller in communication with the PLL for outputting a modulation data signal and including;
an analog to digital converter (ADC) for receiving the tuning voltage fed back from the PLL on a VCO gain tracking feedback loop;
a gain control lookup table for storing calibration data, determined based on the tuning voltage fed back from the PLL on the VCO gain tracking feedback loop, for one or more respective mobile station sub-bands; and
a gain setting DAC for outputting a modulation gain control signal to the synthesizer, the modulation gain control signal being derived from the calibration data retrieved from the lookup table based on a mobile station sub-band of operation.
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Accused Products
Abstract
Voltage controlled oscillator (VCO) gain tracking is used for programming modulation gain settings to minimize modulation distortion in a low bandwidth phase locked loop of a mobile station (10). A synthesizer (20) generates a tuning voltage (Vt) for controlling a frequency of a voltage controlled oscillator (VCO) modulated radio frequency signal. A controller (22) outputs a modulation data signal and includes an analog to digital converter (72) for receiving the tuning voltage from the synthesizer (20) on a VCO feedback loop (70), a gain control lookup table (LUT) (76) for storing modulation gain setting calibration data for respective mobile station sub-bands, and a gain setting digital to analog converter (DAC) (78) for outputting a modulation gain control signal to the synthesizer (20). The modulation gain setting calibration data is calibrated using a one-time or continuous calibration methodology during, respectively, a background or normal mode of mobile station operation.
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Citations
30 Claims
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1. A system for calibrating mobile station modulation gain settings, comprising:
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a synthesizer including a phase locked loop (PLL), the PLL for outputting a tuning voltage for controlling a frequency of a voltage controlled oscillator (VCO) modulated signal; and
a controller in communication with the PLL for outputting a modulation data signal and including;
an analog to digital converter (ADC) for receiving the tuning voltage fed back from the PLL on a VCO gain tracking feedback loop;
a gain control lookup table for storing calibration data, determined based on the tuning voltage fed back from the PLL on the VCO gain tracking feedback loop, for one or more respective mobile station sub-bands; and
a gain setting DAC for outputting a modulation gain control signal to the synthesizer, the modulation gain control signal being derived from the calibration data retrieved from the lookup table based on a mobile station sub-band of operation. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A mobile station controller for controlling a dual port synthesizer, comprising:
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an analog to digital controller (ADC) for receiving a tuning voltage fed back on a voltage controlled oscillator (VCO) gain tracking feedback loop and for converting the tuning voltage to a digital signal;
a lookup table for storing high port gain calibration settings for one or more respective mobile station sub-bands, the high port gain calibration settings being based on the tuning voltage fed back on the VCO gain tracking feedback loop; and
a high port gain setting DAC for outputting a high port gain control signal based on the high port gain calibration settings stored the lookup table in response to a mobile station sub-band of operation. - View Dependent Claims (10, 11, 12, 13, 14)
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15. A method of calibrating modulation gain settings of a mobile station, comprising:
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looking up stored calibration parameters, including at least one of a number of sub-bands and number of channel measurements required for calibration of one or more of the number of sub-bands;
transmitting on the one or more of the number of sub-bands;
measuring fed-back tuning voltages resulting from the transmitting on the one or more of the number of sub-bands; and
storing calibration data calculated based on the measuring of fed-back tuning voltages resulting from the transmitting on the one or more of the number of sub-bands for later use in determining respective modulation gain settings for the one or more of the number of sub-bands. - View Dependent Claims (16, 17, 18, 19)
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20. A method of continuously updating high port gain calibration settings of a mobile station dual port input synthesizer, comprising:
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initiating a background mode of transmitter operation;
measuring respective tuning voltages resulting from the initiating of a background mode of operation during transmitter operation at different locations in a mobile station sub-band of operation, each of which is input from a voltage controlled oscillator (VCO) gain tracking feedback loop;
determining a high port gain calibration setting for the mobile station sub-band of operation based on one of a difference in two of the respective tuning voltages at two different locations in the mobile station sub-band of operation and a calculated polynomial model of tuning voltage versus frequency for the mobile station sub-band of operation; and
storing the high port gain calibration setting for setting a high port gain for the mobile station sub-band of operation.
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21. A mobile station transmitter configuration, comprising:
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a voltage controlled oscillator (VCO) for generating a carrier signal and for receiving a tuning voltage to control modulation of a radio frequency (RF) signal on the carrier signal;
a transmitter in communication with the VCO for transmitting the RF signal;
a synthesizer for generating the tuning voltage input into the VCO for controlling modulation of the RF signal on the carrier signal; and
a controller including an analog to digital converter (ADC) for receiving the tuning voltage fed back from the synthesizer on a VCO gain tracking feedback loop, a gain control lookup table for storing calibration data for one or more respective mobile station sub-bands, and a digital to analog converter (DAC) for outputting a gain controlled modulation signal, a gain of which is based on the calibration data retrieved from the lookup table. - View Dependent Claims (22, 23, 24, 25, 26, 27, 28, 29, 30)
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Specification