VCO gain tuning using voltage measurements and frequency iteration
First Claim
1. A method comprising:
- providing a VCO output signal of a voltage controlled oscillator to a phase detector module of a phase locked loop PLL, wherein a frequency of said VCO output signal is divided by an adjustable number determined by a divider control signal thus generating a divided VCO output signal, said adjustable number being equal to or larger than one;
providing a reference frequency signal comprising a stable reference frequency corresponding to said frequency divided by said adjustable number to said phase detector module;
generating a PD error signal by a phase detector module in response to said divided VCO output signal, further in response to said reference frequency signal and in response to said divider control signal, wherein a VCO tuning voltage signal is one of;
a) said PD error signal, and b) said PD error signal filtered by a low-pass filter;
generating a calibration signal and said divider control signal by a calibration control module in response to said VCO tuning voltage signal according to a predetermined criterion; and
providing said VCO tuning voltage signal and said calibration signal to said voltage controlled oscillator for implementing gain tuning of said VCO output signal of said voltage controlled oscillator according to said predetermined criterion.
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Abstract
This invention describes a method for gain tuning of a voltage-controlled oscillator of a phase locked loop (PLL) of an electronic device using voltage measurements and a frequency iteration. The invention presents a method of minimizing integrated VCO gain variations. More specifically, the invention implementation is based on an analysis which includes changing the VCO frequency by iteration steps and optionally calculating said iteration steps and measuring a gain of said voltage controlled oscillator (VCO) at said frequencies changed by the iteration steps, wherein the analysis is based on a predetermined criterion. The present invention can be used in any radio architecture that requires limiting of the VCO gain variation and tuning its center frequency.
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Citations
29 Claims
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1. A method comprising:
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providing a VCO output signal of a voltage controlled oscillator to a phase detector module of a phase locked loop PLL, wherein a frequency of said VCO output signal is divided by an adjustable number determined by a divider control signal thus generating a divided VCO output signal, said adjustable number being equal to or larger than one; providing a reference frequency signal comprising a stable reference frequency corresponding to said frequency divided by said adjustable number to said phase detector module; generating a PD error signal by a phase detector module in response to said divided VCO output signal, further in response to said reference frequency signal and in response to said divider control signal, wherein a VCO tuning voltage signal is one of;
a) said PD error signal, and b) said PD error signal filtered by a low-pass filter;generating a calibration signal and said divider control signal by a calibration control module in response to said VCO tuning voltage signal according to a predetermined criterion; and providing said VCO tuning voltage signal and said calibration signal to said voltage controlled oscillator for implementing gain tuning of said VCO output signal of said voltage controlled oscillator according to said predetermined criterion. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. An electronic device comprising:
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a voltage controlled oscillator, responsive to a VCO tuning voltage signal and to a calibration signal, configured to provide a VCO output signal, wherein a frequency of said VCO output signal is divided by an adjustable number determined by a divider control signal, thus generating a divided VCO output signal, said adjustable number being equal to or larger than one; a reference frequency module, configured to provide a reference frequency signal comprising a stable reference frequency corresponding to said frequency divided by said adjustable number; a phase detector module, responsive to said reference frequency signal, responsive to said said divided VCO output signal and responsive to a divider control signal, configured to provide a PD error signal, wherein a VCO tuning voltage signal is one of;
a) said PD error signal, and b) said PD error signal filtered by a low-pass filter; anda calibration control module, responsive to said VCO tuning voltage signal, configured to provide said calibration signal and said divider control signal to said voltage controlled oscillator for implementing gain tuning of said VCO output signal of said voltage controlled oscillator according to said predetermined criterion. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23)
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24. An integrated circuit comprising:
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a voltage controlled oscillator, responsive to a VCO tuning voltage signal and to a calibration signal, configured to provide a VCO output signal, wherein a frequency of said VCO output signal is divided by an adjustable number determined by a divider control signal, thus generating a divided VCO output signal, said adjustable number being equal to or larger than one; a reference frequency module, configured to provide a reference frequency signal comprising a stable reference frequency corresponding to a said frequency divided by said adjustable number; a phase detector module, responsive to said reference frequency signal, responsive to said said divided VCO output signal and responsive to a divider control signal, configured to provide a PD error signal, wherein a VCO tuning voltage signal is one of;
a) said PD error signal, and b) said PD error signal filtered by a low-pass filter; anda calibration control module, responsive to said VCO tuning voltage signal, configured to provide said calibration signal and said divider control signal to said voltage controlled oscillator for implementing gain tuning of said VCO output signal of said voltage controlled oscillator according to said predetermined criterion. - View Dependent Claims (25, 26, 27)
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28. An apparatus, comprising:
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means for providing a VCO output signal, wherein a frequency of said VCO output signal is divided by an adjustable number determined by a divider control signal thus generating a divided VCO output signal, said adjustable number being equal to or larger than one; means for providing a reference frequency signal comprising a stable reference frequency corresponding to said frequency divided by said adjustable number to said phase detector module; means for generating a PD error signal in response to said divided VCO output signal, further in response to said reference frequency signal and in response to said divider control signal, wherein a VCO tuning voltage signal is one of;
a) said PD error signal, and b) said PD error signal filtered by a low-pass filter;means for generating a calibration signal and said divider control signal in response to said VCO tuning voltage signal according to a predetermined criterion, and for providing said VCO tuning voltage signal and said calibration signal to said means for providing the VCO output signal for implementing gain tuning of said VCO output signal according to said predetermined criterion. - View Dependent Claims (29)
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Specification