Method and device for controlling tail current of inductance-capacitance voltage-controlled oscillator

Abstract

The invention relates to a control method and device for the tail current of an inductance-capacitance voltage-controlled oscillator. Among them, the control method of the tail current of the LCC voltage controlled oscillator includes: detecting the tail current and the inductance corresponding to the maximum point in the curve of the oscillation frequency of the LCC voltage controlled oscillator changing with the tail current at m frequency points The oscillation frequency of the capacitive voltage-controlled oscillator; according to the tail current and the oscillation frequency of the inductor-capacitor voltage-controlled oscillator, determine the corresponding relationship between the optimal FoM tail current and the oscillation frequency of the inductor-capacitor voltage-controlled oscillator; according to the The corresponding relationship between the optimal FoM tail current and the oscillation frequency of the LC-VCO, obtain the optimal FoM tail current corresponding to the oscillating frequency of any LC-VCO, and oscillate according to the current LC-VCO The optimal FoM tail current corresponding to the frequency controls the tail current source of the inductor-capacitor voltage-controlled oscillator to generate the tail current. The invention improves the robustness of the phase noise performance of the LC-VCO.

Description

technical field [0001] The invention relates to the field of electronics, in particular to a method and device for controlling the tail current of an inductance-capacitance voltage-controlled oscillator. Background technique [0002] LC-VCO (inductor and capacitor based Voltage-Controlled Oscillator, inductance-capacitance voltage-controlled oscillator) is one of the core modules of the radio frequency transceiver chip. The LC-VCO is usually placed in a PLL (PhaseLocked Loop, phase-locked loop), and together with the PLL, provides a high-precision LO (Local Oscillator, local oscillator) signal for the RF transceiver chip, or provides a suitable clock signal for the RF transceiver chip. Phase noise (PhaseNoise) is one of the most important performance indicators of LC-VCO. Its quality determines the spectral purity of the local oscillator signal and the jitter of the clock signal generated by it; and the spectral purity and jitter , will affect or even limit the performance ...

AI Technical Summary

Problems solved by technology

[0017] To sum up, the existing technical solutions of LC-VCO have the following disadvantages: 1) Although it is hoped to bias the LC-VCO under the optimal FoM tail current during design, it is impossible to take into account process changes and LC-VCO frequency 2) Using a large RC filter not only occupies a large chip area, but also has many other problems, and it is not an ideal solution

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