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Closed loop VCO (Voltage Controlled Oscillator) linearity correcting circuit based on FPGA (Field Programmable Gate Array)

A correction circuit and linearity technology, applied in the field of VCO linearity correction circuit, closed-loop VCO linearity correction circuit, can solve the problems of low linearity correction accuracy, poor environmental adaptability, low correction efficiency, etc., to achieve high versatility, real-time The effect of high performance and simple circuit structure

Active Publication Date: 2013-07-03
BEIJING HUAHANG RADIO MEASUREMENT & RES INST
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  • Description
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  • Application Information

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Problems solved by technology

However, the above correction system 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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  • Closed loop VCO (Voltage Controlled Oscillator) linearity correcting circuit based on FPGA (Field Programmable Gate Array)
  • Closed loop VCO (Voltage Controlled Oscillator) linearity correcting circuit based on FPGA (Field Programmable Gate Array)
  • Closed loop VCO (Voltage Controlled Oscillator) linearity correcting circuit based on FPGA (Field Programmable Gate Array)

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Embodiment Construction

[0032] Principle of invention

[0033] 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 closed loop VCO (Voltage Controlled Oscillator) linearity correcting circuit based on an FPGA (Field Programmable Gate Array), which comprises an FPGA digital circuit, a DAC digital-to-analogue conversion circuit, an amplification filter circuit, a frequency division circuit and a drive filter circuit, wherein the FPGA digital circuit is connected with the drive filter circuit and the DAC digital-to-analogue conversion circuit respectively; the DAC digital-to-analogue conversion circuit is connected with the amplification filter circuit; and the drive filter circuitis connected with the frequency division circuit. The circuit is simple in structure, clever in design, high in real-time property, timely, reliable, high in commonality and accurate in linearity correction, and can effectively correct the linearity of the VCO and solve numerous limitation problems in traditional VCO linearity correction.

Description

technical field [0001] The invention relates to a VCO linearity correction circuit, in particular to an FPGA-based closed-loop VCO linearity correction circuit, 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 o...

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/099H03L7/085
Inventor 刘保生孙炜岳小军余华章张远航
Owner BEIJING HUAHANG RADIO MEASUREMENT & RES INST