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A Multi-stage VCO Frequency Calibration Method Applied to Phase Locked Loop

A technology of frequency calibration and phase-locked loop, which is applied in the field of radio frequency and microwave, can solve the problems of calibration accuracy system error, error, system error, etc., and achieve the effect of reducing system error, improving accuracy, and improving frequency calibration accuracy

Active Publication Date: 2022-05-17
SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

In this scenario, no matter how the scale factor is selected, there will be a systematic error in the calibration accuracy, which cannot be reduced by reducing the scale factor. The range of this system error is [SD, BD]
[0009] image 3 In Scenario D, the nominal minimum frequency and nominal maximum frequency of the multi-segment VCO are contained between the actual minimum frequency and the actual maximum frequency, that is, In this scenario, no matter how the scale factor is selected, there will be a systematic error in the calibration accuracy, which cannot be reduced by reducing the scale factor. The range of this system error is [SD,BD]∪[BG,SG]
[0010] It can be seen from the above that the existing multi-stage VCO phase-locked loop frequency calibration method has a systematic error when calibrating certain application scenarios. The main purpose of the present invention is to eliminate this systematic error and optimize the process

Method used

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  • A Multi-stage VCO Frequency Calibration Method Applied to Phase Locked Loop
  • A Multi-stage VCO Frequency Calibration Method Applied to Phase Locked Loop
  • A Multi-stage VCO Frequency Calibration Method Applied to Phase Locked Loop

Examples

Experimental program
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Effect test

Embodiment 1

[0057] In this embodiment, the following definitions are made:

[0058] f min_n It is the lowest frequency specified in the product manual of multi-segment VCO frequency band n, which belongs to the uncalibrated initial lowest frequency. For example, the product manual for frequency band 3 has a nominal minimum frequency of f min_3 .

[0059] f max_n It is the nominal maximum frequency in the product manual of the multi-segment VCO frequency band n, which belongs to the uncalibrated initial maximum frequency.

[0060] f max_n is the calibrated highest frequency of multi-segment VCO band n.

[0061] f min_n is the lowest calibrated frequency of multi-band VCO band n.

[0062] image 3 , Figure 5 , Image 6 The "=" in "n=n+1, k=k+1, m=m+1, k=k-1, m=m-1" means operation and assignment, it does not mean that the formula must be an equation .

[0063] Formula 1: F max_nk =f max_n -(f max_n -f min_n )×a×k

[0064] Formula 2: F min_nm =f min_n +(f max_n -f min_n...

Embodiment 2

[0089] On the basis of Example 1, combined with figure 2 The circuit shown above proposes a multi-stage VCO-based phase-locked loop frequency calibration method based on the existing frequency calibration method. The flow chart of the method is as follows Figure 4 shown.

[0090] to combine figure 2 with Figure 4 , the working process of this embodiment includes as follows:

[0091] Process 1: Calibration starts; in this step, the start process can be performed according to the existing method flow; for example, it includes the following processes 1.1 to 1.9.

[0092] Process 1.1: Press figure 2 The circuit logic relationship shown connects the circuits.

[0093] Process 1.2: The VCO selection control code of different frequency bands (band 1, frequency band 2, ... frequency band N) of the multi-band VCO, the lowest frequency and the highest frequency of each frequency band nominal in the product manual (this frequency is the uncalibrated initial frequency ) into th...

Embodiment 3

[0122] On the basis of Example 2, for figure 2 In the different scenarios shown, scenario B, scenario C, and scenario D use the existing frequency calibration method, there will be an inherent systematic error. In this example, a multi-segment VCO that conforms to scenario B is selected, based on an application described in the present invention. The multi-stage VCO frequency calibration method of the phase-locked loop is used to carry out the circuit design, and use Figure 4 The described method calibrates a multi-segment VCO.

[0123] In this embodiment, three aspects including device selection, working process and test results are mainly described.

[0124] Device selection, the phase detector uses HMC704, the loop filter uses a third-order passive loop filter (circuit built with capacitors and resistors), the multi-stage VCO uses SIV019SP4, the splitter uses a power divider EP2K, and the controller of the control unit The memory and memory are realized by independent d...

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Abstract

The invention discloses a multi-stage VCO frequency calibration method applied to a phase-locked loop, comprising steps: S1, calibration starts; S2, after the start, the controller of the control unit judges whether the phase-locked loop is locked; if not locked, returns to the step S1; if locked and the number of times of calibration k>1 at this time, then enter step S3; if locked and k=1 at this time, enter step S4; S3, record the locked frequency value in the memory of the control unit, the frequency The value is the highest frequency F of frequency band n after calibration max_n ; S4, subtracting 1 from the count of the number of times of calibration k, and assigning a value to k, covering the previous k value, that is, k=k-1, etc.; ) state, the same batch of multi-segment VCO frequency segments can completely cover the broadband frequency range, and improve the frequency calibration accuracy.

Description

technical field [0001] The present invention relates to the radio frequency microwave field, and more specifically, relates to a multi-stage VCO frequency calibration method applied to a phase-locked loop. Background technique [0002] The phase-locked loop circuit is a closed-loop system, and the three most critical components of the system are: phase detector, loop filter, and VCO. VCO is an important part of the circuit. In recent years, a multi-segment VCO has begun to be used in phase-locked loops, such as figure 1 shown. [0003] Compared with the traditional broadband VCO, the frequency multi-segment VCO has lower phase noise. The most important feature of the frequency multi-segment VCO is to divide the frequency into several segments, so selecting the appropriate combination of frequency bands to completely cover all frequency bands is the key point of circuit design. However, there is an unavoidable shortcoming. Due to the limitations of materials and processes,...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): H03L7/085
CPCH03L7/085
Inventor 陈昌锐谢翔宇侯照临张文锋刘武广王枫
Owner SOUTHWEST CHINA RES INST OF ELECTRONICS EQUIP
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