Millimeter-wave phase-locked loop with injection-locked frequency divider using quarter-wavelength transmission line and method of calibration
First Claim
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1. A millimeter-wave phase-locked loop (PLL) comprising:
- an injection-locked frequency divider (ILFD) to generate a divided output frequency from an injected millimeter-wave frequency;
calibration circuitry to determine values for an ILFD control signal to be applied to the ILFD for a selected oscillating frequency band to cause the ILFD to operate at or near a center of a locking range of the ILFD; and
a voltage controlled oscillator (VCO) to generate the injected millimeter-wave frequency as an output frequency of the PLL based at least in part on the divided output frequency generated by the ILFD,wherein the ILFD comprises;
a pseudo-differential pair of transistors;
a quarter-wavelength transmission line coupled between the pseudo-differential pair and ground to receive the injected millimeter-wave frequency; and
a pair of transistors operating as voltage controlled resistors responsive to the ILFD control signal.
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Abstract
Embodiments of a millimeter-wave phase-locked loop with an injection-locked frequency divider (ILFD) are generally described herein. Other embodiments may be described and claimed. In some embodiments, the ILFD uses a quarter-wavelength transmission line. A method of calibrating an ILFD is also provided to allow the ILFD to operate at or near the center of its locking range for each of a plurality of VCO oscillating frequency bands.
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Citations
16 Claims
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1. A millimeter-wave phase-locked loop (PLL) comprising:
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an injection-locked frequency divider (ILFD) to generate a divided output frequency from an injected millimeter-wave frequency; calibration circuitry to determine values for an ILFD control signal to be applied to the ILFD for a selected oscillating frequency band to cause the ILFD to operate at or near a center of a locking range of the ILFD; and a voltage controlled oscillator (VCO) to generate the injected millimeter-wave frequency as an output frequency of the PLL based at least in part on the divided output frequency generated by the ILFD, wherein the ILFD comprises; a pseudo-differential pair of transistors; a quarter-wavelength transmission line coupled between the pseudo-differential pair and ground to receive the injected millimeter-wave frequency; and a pair of transistors operating as voltage controlled resistors responsive to the ILFD control signal. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. An injection-locked frequency divider (ILFD) to generate a divided output frequency from an injected millimeter-wave frequency comprising:
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a pseudo-differential pair of transistors; a quarter-wavelength transmission line coupled between the pseudo-differential pair and ground to receive the injected millimeter-wave frequency; and a pair of transistors operating as voltage-controlled resistors responsive to an ILFD control signal selected to cause the ILFD to operate at or near a center of a locking range of the ILFD. - View Dependent Claims (10, 11, 12)
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13. A method of calibrating an injection-locked frequency divider (ILFD) comprising:
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measuring a further divided down output frequency for different settings of an ILFD control signal when applied to the ILFD for a selected VCO oscillating frequency band to identify a locking range for the ILFD; and selecting a value for the ILFD control signal for the selected VCO oscillating frequency band that causes the ILFD to operate at or near a center of the locking range, wherein for each of a plurality of selected VCO oscillating frequency bands, the method includes providing a value for the ILFD control signal to be applied to the ILFD to cause the ILFD to operate at or near the center of the locking range for the selected oscillating frequency band, wherein the method further comprises; repeating the measuring of the further divided down output frequency for the different settings of the ILFD control signal to identify a locking range for each of the selected VCO oscillating frequency bands; and storing the selected value for the ILFD control signal in the LUT for each of the VCO oscillating frequency bands, wherein the selected values for the ILFD control signal allows the ILFD to operate at or near the center of the locking range for the VCO oscillating frequency bands, and wherein during the measuring, a VCO control voltage is set to a predetermined value to disable a phase/frequency detector and charge pump.
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14. A wireless communication device comprising front-end circuitry for communicating millimeter-wave signals, wherein the front-end circuitry comprises a millimeter-wave phase-locked loop (PLL) for use in generating the millimeter-wave signals, and wherein the millimeter-wave PLL comprises:
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an injection-locked frequency divider (ILFD) to generate a divided output frequency from an injected millimeter-wave frequency; calibration circuitry to determine values for an ILFD control signal to be applied to the ILFD for a selected VCO oscillating frequency band to cause the ILFD to operate at or near a center of a locking range of the ILFD; and a voltage controlled oscillator (VCO) to generate the injected millimeter-wave frequency as an output frequency of the PLL based at least in part on the divided output frequency generated by the ILFD, wherein the ILFD comprises; a pseudo-differential pair of transistors; a quarter-wavelength transmission line coupled between the pseudo-differential pair and ground to receive the injected millimeter-wave frequency; and a pair of transistors operating as voltage controlled resistors responsive to the ILFD control signal. - View Dependent Claims (15)
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16. A wireless communication device comprising front-end circuitry for communicating millimeter-wave signals, wherein the front-end circuitry comprises a millimeter-wave phase-locked loop (PLL) for use in generating the millimeter-wave signals, and wherein the millimeter-wave PLL comprises:
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an injection-locked frequency divider (ILFD) to generate a divided output frequency from an injected millimeter-wave frequency; calibration circuitry to determine values for an ILFD control signal to be applied to the ILFD for a selected VCO oscillating frequency band to cause the ILFD to operate at or near a center of a locking range of the ILFD; and a voltage controlled oscillator (VCO) to generate the injected millimeter-wave frequency as an output frequency of the PLL based at least in part on the divided output frequency generated by the ILFD, wherein for each of a plurality of selectable VCO oscillating frequency bands, the calibration circuitry is to provide a value for the ILFD control signal to be applied to the ILFD to cause the ILFD to operate at or near the center of the locking range for the selected oscillating frequency band, wherein the PLL further comprises a look-up table (LUT) to store the values for the ILFD control signal for each of a plurality of selectable VCO oscillating frequency bands, wherein each value of the ILFD control signal when applied to the ILFD causes the ILFD to operate at or near the center of the locking range for an associated one of the selectable VCO oscillating frequency bands, wherein the calibration circuitry is configured to perform a calibration procedure for the PLL, wherein as part of the calibration procedure, the calibration circuitry is configured to; measure a further divided down output frequency for different settings of the ILFD control signal when applied to the ILFD for the selected VCO oscillating frequency band to identify the locking range for the ILFD; and select a value for the ILFD control signal for the selected VCO oscillating frequency band that causes the ILFD to operate at or near the center of the locking range, wherein the further divided down output frequency is generated by a second divider stage that divides the ILFD output frequency by an integer value, wherein during the calibration procedure, the calibration circuitry further; repeats the measuring of the further divided down output frequency for the different settings of the ILFD control signal to identify the locking range for the ILFD for each of a plurality of VCO oscillating frequency bands; and stores the selected value for the ILFD control signal in the LUT for each of the plurality of VCO oscillating frequency bands, wherein the selected values for the ILFD control signal allows the ILFD to operate at or near the center of the locking range for the plurality of VCO oscillating frequencies, and wherein during the calibration procedure, the calibration circuitry sets a VCO control voltage to a predetermined value to disable a phase/frequency detector and charge pump of the PLL.
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Specification