Systems and methods for calibrating a dual port phase locked loop
First Claim
1. A phase-locked loop (PLL) comprising:
- a voltage-controlled oscillator (VCO) configured to generate an output signal having variable frequency;
a high-port modulator coupled to the VCO, the high-port modulator configured to inject a modulation signal into the VCO, based on an input modulation value; and
a high-port calibration control module configured tocalibrate the input modulation value to a first modulation value that results in the output signal having a positive frequency change from an initial output frequency,capture a positive frequency value of the output signal after a first accumulation time period,calibrate the input modulation value to a second modulation value that results in the output signal having a negative frequency change from the initial output frequency,capture a negative frequency value of the output signal after a second accumulation time period,calculate a calibration scale factor based on a difference between the positive and negative frequency values,calculate a plurality of frequency scale factors associated with the calibration scale factor, whereineach of the plurality of frequency scale factors corresponds to one of a plurality of reference frequencies, andeach of the plurality of reference frequencies are configured to be utilized as an input control frequency to the VCO, andstore the plurality of frequency scale factors and the calibration scale factor in a lookup table.
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Abstract
The present disclosure provides for a phase-locked loop (PLL) that includes a high-port calibration control module configured to calibrate an input modulation value of a voltage-controlled oscillator (VCO) to a first modulation value that results in an output signal of the VCO having a positive frequency change from an initial output frequency, and capture a positive frequency value of the output signal after a first accumulation time period. The high-port calibration control module is also configured to calibrate the input modulation value of the VCO to a second modulation value that results in the output signal having a negative frequency change from the initial output frequency, capture a negative frequency value of the output signal after a second accumulation time period, and calculate a calibration scale factor based on a difference between the positive and negative frequency values.
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Citations
17 Claims
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1. A phase-locked loop (PLL) comprising:
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a voltage-controlled oscillator (VCO) configured to generate an output signal having variable frequency; a high-port modulator coupled to the VCO, the high-port modulator configured to inject a modulation signal into the VCO, based on an input modulation value; and a high-port calibration control module configured to calibrate the input modulation value to a first modulation value that results in the output signal having a positive frequency change from an initial output frequency, capture a positive frequency value of the output signal after a first accumulation time period, calibrate the input modulation value to a second modulation value that results in the output signal having a negative frequency change from the initial output frequency, capture a negative frequency value of the output signal after a second accumulation time period, calculate a calibration scale factor based on a difference between the positive and negative frequency values, calculate a plurality of frequency scale factors associated with the calibration scale factor, wherein each of the plurality of frequency scale factors corresponds to one of a plurality of reference frequencies, and each of the plurality of reference frequencies are configured to be utilized as an input control frequency to the VCO, and store the plurality of frequency scale factors and the calibration scale factor in a lookup table. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A semiconductor device comprising:
a phase-locked loop (PLL) comprising; a high-port calibration control module configured to calibrate an input modulation value of a voltage-controlled oscillator (VCO) to a first modulation value that results in an output signal of the VCO having a positive frequency change from an initial output frequency, capture positive frequency value of the output signal after a first accumulation time period, calibrate the input modulation value of the VCO to a second modulation value that results in the output signal having a negative frequency change from the initial output frequency, capture a negative frequency value of the output signal after a second accumulation time period, and calculate a calibration scale factor based on a difference between the positive and negative frequency values, including calculate a change in modulation value equal to a difference between the first and second modulation values; calculate a change in output frequency equal to a difference between the positive and negative frequency values; calculate calibration resolution equal to the change in output frequency divided by the change in modulation value; and calculate the calibration scale factor equal to a low-port modulation resolution divided by the calibration resolution, wherein the low-port modulation resolution is equal to a reference frequency divided by base 2 raised to a number of modulation steps available in a low-port modulator. - View Dependent Claims (15, 16)
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17. A method for operating a phase-locked loop (PLL) comprising:
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calibrating an input modulation value of a voltage-controlled oscillator (VCO) of the PLL to a first modulation value that results in an output signal of the VCO having a positive frequency change from an initial output frequency, capturing a positive frequency value of the output signal after a first accumulation time period, calibrating the input modulation value of the VCO to a second modulation value that results in the output signal having a negative frequency change from the initial output frequency, capturing a negative frequency value of the output signal after a second accumulation time period, and calculating a calibration scale factor based on a difference between the positive and negative frequency values, including; calculating a change in modulation value equal to a difference between the first and second modulation values; calculating a change in output frequency equal to a difference between the positive and negative frequency values; calculating calibration resolution equal to the change in output frequency divided by the change in modulation value; and calculating the calibration scale factor equal to a low-port modulation resolution divided by the calibration resolution, wherein the low-port modulation resolution is equal to a reference frequency divided by base 2 raised to a number of modulation steps available in a low-port modulator.
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Specification