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

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

Active Publication Date: 2012-06-13
BEIJING HUAHANG HAIYING NEW TECH DEV
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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 swept frequency 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 researches are based on the delay-phase discrimination method, which is a closed-loop digital correction with a digital processing system as the core. method. Its working principle is: the difference frequency signal output by the mixing is sampled by A / D and the digital signal processor uses an algorithm to accurately calculate the phase, thereby obtaining the frequency offset function, and then the control voltage of the next cycle can be obtained. After the D / A conversion, the VCO is controlled, and the process is repeated continuously to realize the linearity correction 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 proce...

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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 a closed loop VCO linearity correction method based on FPGA, 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 changes with control voltage. It is widely used in radar systems, especially linear frequency modulated continuous wave radar (LFMCW). VCO as a core component will determine the performance of the entire LFMCW radar system. However, due to the inherent tuning nonlinearity of the varactor diode of the ESC and the contradiction between high stability and broadband in the oscillator structure, the RF output of the VCO produces sweep nonlinearity and power fluctuations during the frequency sweep process, and its own frequency modulation linearity is generally only Can reach 2% to 5%. In order to improve the o...

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Application Information

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Patent Type & Authority Applications(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