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Field programmable gate array (FPGA)-based closed loop voltage controlled oscillator (VCO) linearity correction method

A calibration method and linearity technology, applied in electrical components, power oscillators, etc., can solve the problems of low linearity calibration accuracy, low calibration efficiency, poor environmental adaptability, etc., to solve the problem of limitations, accurate linearity calibration, Real-time high effect

Active Publication Date: 2014-05-07
BEIJING HUAHANG HAIYING NEW TECH DEV
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  • Abstract
  • Description
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  • Application Information

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Problems solved by technology

[0004] However, the above correction method has the following defects: low reliability, poor versatility, low linearity correction accuracy, poor environmental adaptability, especially for correcting the linearity of the frequency sweep signal, the correction efficiency is low

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  • Field programmable gate array (FPGA)-based closed loop voltage controlled oscillator (VCO) linearity correction method
  • Field programmable gate array (FPGA)-based closed loop voltage controlled oscillator (VCO) linearity correction method
  • Field programmable gate array (FPGA)-based closed loop voltage controlled oscillator (VCO) linearity correction method

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Embodiment Construction

[0030] Principle of invention

[0031] VCO frequency sweep nonlinear correction technology is one of the key technologies to realize high-precision and high-resolution linear frequency modulation continuous wave radar. At present, more studies are based on the delay-phase detection method, which is a closed-loop digital correction based on a digital processing system. method. Its working principle is: after the difference frequency signal output by the mixer is sampled by A / D, the digital signal processor uses the algorithm to calculate the phase accurately, so as to obtain the frequency offset function, and then the control voltage of the next cycle can be obtained. After D / A conversion, the VCO is controlled, and this process is repeated continuously to correct the linearity of the VCO, so that the VCO output waveform is close to the ideal chirp signal. The core part of the closed-loop digital correction system is the principle of the digital processing system. From the per...

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Abstract

The invention relates to a field programmable gate array (FPGA)-based closed loop voltage controlled oscillator (VCO) linearity correction method, which comprises voltage control word output, voltage-controlled frequency generation, frequency measurement, voltage control word searching and storage. By the method, the linearity of a VCO can be effectively corrected; the method is high in real-time performance, timely, reliable, high in universality and accurate in linearity correction; and the problem of limitation of the conventional VCO linearity correction is solved.

Description

technical field [0001] The invention relates to a VCO linearity correction method, in particular to an FPGA-based closed-loop VCO linearity correction method, which belongs to the technical field of signal processing and system control. Background technique [0002] Millimeter-wave voltage-controlled oscillator (VCO) is an adjustable signal source whose oscillation frequency varies with the control voltage. It is widely used in radar systems, especially linear frequency-modulated continuous wave radar (LFMCW). As a core component, VCO will determine the performance of the entire LFMCW radar system. However, due to the inherent tuning nonlinearity of the variable capacitance diode of the electric tuning element and the contradiction between high stability and broadband in the oscillator structure, the RF output of the VCO produces frequency sweep nonlinearity and power fluctuations during the frequency sweep process, and its own frequency modulation linearity is generally onl...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03B5/04H03B5/32
Inventor 刘保生孙炜岳小军余华章张远航
Owner BEIJING HUAHANG HAIYING NEW TECH DEV