Voltage-controlled oscillator circuit and phase-locked loop

Abstract

The invention relates to a voltage-controlled oscillator circuit comprising a resonant cavity module and a power supply module, wherein the resonant cavity module increases the tuning range of the voltage-controlled oscillator circuit and the linearity of the gain of the voltage-controlled oscillator circuit by adopting three groups of coupled inductor structures, the phase noise is reduced, no capacitor array needs to be used, and the influence of stray capacitance on the oscillation frequency is reduced. The invention further relates to a phase-locked loop, the phase-locked loop comprises avoltage-controlled oscillator circuit and a frequency divider portion, and the frequency divider portion is a combination of a high-speed frequency-halving circuit and a prescaler, thereby not only ensuring the accuracy of the frequency dividing ratio, but also reducing the power consumption required for the frequency divider portion, and simplifying the circuit structure.

Description

technical field [0001] The invention belongs to the field of digital-analog hybrid integrated circuit design, and in particular relates to a voltage-controlled oscillator circuit and a phase-locked loop. Background technique [0002] With the development of high-speed data transmission communication systems, the requirements for bandwidth have attracted the attention of many researchers. As a key component in modern communication systems, voltage-controlled oscillators (VCOs) are often used in phase-locked loops to generate Local oscillator signal source, high-performance communication system strictly requires VCO to have a wide tuning range, high tuning linearity and low phase noise. Since other parameters that determine the loop bandwidth are fixed, a relatively large change in the VCO gain will cause a change in the PLL loop bandwidth, deteriorating the phase noise and loop stability, so the design requires the VCO to have a wide tuning range and high Gain linearity. ...

AI Technical Summary

Problems solved by technology

Since other parameters that determine the loop bandwidth are fixed, a relatively large change in the VCO gain will cause a change in the PLL loop bandwidth, deteriorating the phase noise and loop stability, so the design requires the VCO to have a wide tuning range and high Gain Linearity

[0003] The traditional voltage-controlled oscillator includes a set of varactors and inductors, and the tuning frequency of the oscillator is increased through a capacitor array. However, adding a capacitor array will increase the parasitic capacitance and affect the frequency accuracy of the voltage-controlled oscillator.

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