CN110418093B - HFC amplifier multi-port output consistency calibration method - Google Patents
HFC amplifier multi-port output consistency calibration method Download PDFInfo
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Abstract
The invention relates to a method for calibrating the output consistency of a multi-path port of an HFC amplifier, belonging to the field of electronic device calibration. The method comprises the following steps: 1, finding out a branch with minimum gain and a branch with maximum equalization from gain curves of a plurality of branches as reference bases for adjusting attenuation values, completing calibration of the gain values and the equalization values of the plurality of branches, and obtaining ATT calibration adjustment quantities of the plurality of branches; 2, subtracting every two gain curves of the calibrated multiple branches to obtain a central value after subtraction; 3, solving the consistency ATT regulating quantity of the multiple branches by adopting a least square solution method; and 4, summing the calibration ATT regulating quantity of each branch and the consistency ATT regulating quantity of the corresponding branch to obtain the total ATT regulating value of each branch, and controlling the voltage-controlled attenuation quantity of each branch according to the total ATT regulating value of each branch. The method of the invention ensures that the output gain of each port has better consistency, and the output gain is adjusted to a corresponding value range, thereby meeting the requirement of batch production.
Description
Technical Field
The invention relates to the field of calibration of electronic devices, in particular to a method for calibrating the output consistency of a multi-path port of an HFC amplifier.
Background
At present, an HFC amplifier is mainly applied to broadcasting television HFC equipment, the HFC amplifier needs to satisfy multi-path output, each port mainly comprises a duplexer, a coupler, a multiplier tube, a control tuning circuit and the like, and due to the difference of different channels in device layout and various device manufacturing processes, the consistency between the channels is poor, and the layout of rear-end transmission is affected. In the prior art, a manual debugging and calibrating mode is usually adopted, so that the efficiency is low, the precision is not high, the reliability of a product is not high, and the requirements of high precision and batch production cannot be met.
Disclosure of Invention
The invention aims to overcome the defects in the prior art and provide a method for calibrating the output consistency of a multi-path port of an HFC amplifier.
In order to achieve the above purpose, the invention provides the following technical scheme:
a method for calibrating multi-port output consistency of an HFC amplifier comprises the following steps:
s1, finding out the branch with the minimum gain and the branch with the maximum equalizing quantity from the gain curves of the multiple branches of the HFC amplifier, using the branch with the minimum gain and the branch with the maximum equalizing quantity as a reference basis for adjusting the attenuation value, completing the calibration of the gain values and the equalizing values of the multiple branches, and obtaining the ATT calibration adjustment quantity of the multiple branches;
s2, subtracting every two gain curves of the calibrated multiple branches to obtain a central value after subtraction;
s3, solving the consistency ATT regulating quantity of a plurality of branches by adopting a least square solution method to ensure that the sum of squares of the center values after difference is made is minimum;
and S4, summing the calibration ATT regulating quantity of each branch and the consistency ATT regulating quantity of the corresponding branch to obtain the total ATT regulating value of each branch, and controlling the voltage-controlled attenuation quantity of each branch according to the total ATT regulating value of each branch.
The step of S1 includes:
finding out the branch with the minimum gain and the branch with the maximum equalizing quantity from the gain curves of the branches;
taking the branch with the minimum gain as a reference, adjusting the ATT calibration values of other branches except the branch with the minimum gain to make the gains of the highest frequency points of the working frequency bands of all the branches consistent, and acquiring the ATT calibration adjustment quantity of all the branches;
taking the branch with the largest balancing amount as a reference, and adjusting the balancing amounts of other branches except the branch with the largest balancing amount to ensure that the balancing amounts of the working frequency bands of all the branches are consistent;
and adjusting the ATT value and the EQ value of the main circuit where the plurality of branches are located to enable the downlink gain and the EQ to reach preset default values.
The step of S3 includes:
s11, presetting a consistency ATT adjusting value of each branch;
s12, establishing an over-determined equation set and extracting a coefficient matrix of the over-determined equation set according to the consistency ATT adjustment value of each branch and the center value after difference;
and S13, substituting the coefficient matrix of the over-determined equation set and the center value after the difference into a consistency ATT adjustment value calculation formula to obtain the consistency ATT adjustment value of each branch.
The consistency ATT adjustment value calculation formula is as follows:
RF_att2＝lscov(A,B)
wherein, RF _ ATT2 is a consistency ATT adjustment value vector containing consistency ATT adjustment values for each branch; a is a coefficient matrix of an over-determined equation set, B is a center value vector after difference, the center value vector comprises center values after difference of a plurality of branch gain curves in pairs, and an lscov () function is a matlab library function.
Step S3 may also be that, according to the weighting coefficients, a least square solution method is used to find the consistency ATT adjustment values after the multiple branches are corrected, so that the sum of squares of the center values after the differences are made is minimum, and the maximum value and the minimum value after the differences are made for each branch are within a preset range.
After adding the weighting coefficients, the step of S3 includes:
s21, presetting a consistency ATT adjusting value of each branch;
s22, establishing an overdetermined equation set and extracting a coefficient matrix of the overdetermined equation set according to the weighting coefficient, the consistency ATT adjustment value of each branch and the differentiated central value;
and S23, substituting the weighting coefficient, the coefficient matrix of the over-determined equation set and the center value after the difference into a consistency ATT adjustment value calculation formula with correction to obtain the corrected consistency ATT adjustment value of each branch.
The weighting coefficient is set according to the maximum value and the minimum value after the difference of every two channels, or determined according to the peak value after the difference of every two channels.
And according to the weighting coefficient, solving the corrected consistency ATT adjustment values of the multiple branches by adopting a least square solution method, wherein the calculation formula of the corrected consistency ATT adjustment values is as follows:
RF_att2’＝lscov(A，B，w)
wherein, RF _ ATT 2' is a vector of corrected consistency ATT adjustment values, including a corrected consistency ATT adjustment value for each branch; a is a coefficient matrix of an over-determined equation set, B is a center value vector after difference, and comprises center values after difference of a plurality of branch gain curves in pairs, w is a weighting coefficient vector, and comprises adjustment coefficients after difference of the plurality of branch gain curves in pairs, and the lscov () function is a matlab library function.
The value of each adjustment coefficient in the weighting coefficient vector w is 1 or 10.
A multi-port output consistency calibration device of an HFC amplifier comprises at least one processor and a memory which is in communication connection with the at least one processor; the memory stores instructions executable by the at least one processor to cause the at least one processor to perform the method of any one of the above aspects.
Compared with the prior art, the invention has the beneficial effects that:
the invention discloses a method for calibrating the consistency of output ports of an HFC amplifier, which comprises the steps of testing curves input to each branch, carrying out difference on every two curves to obtain the central value of the maximum value and the minimum value, then obtaining the adjustment quantity of each channel by obtaining a least square solution to ensure that the sum of squares of z 1-z 6 is minimum, adding a weight coefficient, outputting corresponding voltage by an MCU to control the voltage-controlled attenuation of each branch, ensuring that the output gain consistency of each port is better, adjusting all the output gains to the corresponding value ranges, and meeting the requirements of batch production.
Drawings
FIG. 1 is a flow chart of a method for HFC amplifier output port consistency calibration in accordance with the present invention;
FIG. 2 is a diagram of an experimental environment for implementing a HFC amplifier output port consistency calibration method;
fig. 3 is a schematic block diagram of an HFC amplifier.
Detailed Description
The present invention will be described in further detail with reference to test examples and specific embodiments. It should be understood that the scope of the above-described subject matter is not limited to the following examples, and any techniques implemented based on the disclosure of the present invention are within the scope of the present invention.
Example 1
The functional block diagram of the HFC amplifier is shown in fig. 3, and the HFC amplifier is divided into a main path and branches, where the main path is provided with an Attenuator (ATT), an Amplifier (AMP), and an Equalizer (EQ), and each branch is also provided with a corresponding Attenuator (ATT), Amplifier (AMP), and Equalizer (EQ), and by adjusting the value of the attenuator and the value of the equalizer on each branch, and adjusting the value of the attenuator and the value of the equalizer on the main path, the gain consistency of the outputs of each branch is better, and the sum of squares of the central values is the smallest after the difference between every two branches. An experimental environment for implementing the method for calibrating the consistency of the output ports of the HFC amplifier is shown in fig. 2, and includes an HFC amplifier, a switch matrix, a network analyzer and a computer, wherein the switch matrix is used for implementing the difference between two output signals of each channel of the HFC amplifier, the output difference curve is read and displayed by the network analyzer, and the computer is used for reading the output curve of the network analyzer, controlling the switching of the switch matrix and controlling the parameter output of each Attenuator (ATT) and Equalizer (EQ) in the HFC amplifier.
The HFC amplifier output port consistency calibration method, the flow chart of which is shown in figure 1, comprises the following steps:
step 1, calibrating downlink gain and EQ (equalizer value), and obtaining ATT (attenuator) calibration value of each branch. Taking 4 branches as an example, testing and drawing gain curves of the 4 branches, wherein y0, y1, y2 and y3 are used for representing the gain curves of the 4 branches respectively, each point in the gain curves represents the gain of a corresponding frequency point, and the horizontal axis represents frequency and unit MHz; the vertical axis represents gain in dB.
1) And finding out the branch with the minimum gain from the gain curves of the 4 branches as a reference basis for adjusting the attenuation value, and finding out the branch with the maximum EQ as a reference basis for adjusting the EQ value, wherein the branch with the minimum gain is assumed to be y2, and the branch with the maximum equalization value (EQ value) is assumed to be y 0.
2) And by taking the branch y2 as a reference, adjusting the scaling attenuation values (ATT values) of other branches to make the gain values corresponding to the highest frequency points of the working frequency bands of the branches consistent, wherein the scaling ATT adjustment amount of each branch is respectively RF0_ ATT1, RF1_ ATT1, RF2_ ATT1 and RF3_ ATT1, and by taking the branch y0 as a reference, adjusting the scaling equalization values (EQ values) of other branches to make the EQ values in the working frequency bands of the branches consistent, and the EQ adjustment amount of each branch is RF0_ EQ, RF1_ EQ, RF2_ EQ and RF3_ EQ.
3) And adjusting the ATT value and the EQ value of the main circuit where the 4 branches are located, so that the downlink gain and the EQ reach preset default values.
And 2, subtracting every two gain values of corresponding frequency points of the 4 branch gain curves to obtain the central value of the maximum value and the central value of the minimum value. After scaling, the gain curves for the 4 branches are y'1、y'2、y'3And y'4Respectively, the curves with two differences are respectively expressed as y'1-y'0、y'2-y'0、y'3-y'0、y'2-y'1、y'3-y'1、y'3-y'2For y'1-y'0And taking the maximum value and the minimum value of the curve, wherein the central value between the maximum value and the minimum value is z1, and in the same way, the central values of the other curves subjected to pairwise difference are respectively z2, z3, z4, z5 and z6, the curves subjected to pairwise difference and the corresponding central values are shown in table 1, and the central values z 1-z 6 are reference bases for adjusting the ATT values of all branches.
TABLE 1 curves and corresponding center values after pairwise differencing
And 3, solving the consistency ATT adjustment value of each branch port.
Setting the port consistency ATT values after the adjustment of the 4 branches is completed as RF0_ ATT2, RF1_ ATT2, RF2_ ATT2 and RF3_ ATT 2. Ideally, the deviation between the values on the two pairwise differenced curves and the corresponding central value is 0, that is, the values of the RF1_ att2-RF0_ att2 curves differentiated by the RF1_ att2 and the RF0_ att2 are exactly equal to the central value z1, and similarly, the values on the two pairwise differenced curves of the other branches are also equal to the corresponding central value (reference value).
Then the ideal state holds the following equation:
RF1_att2-RF0_att2＝z1
RF2_att2-RF0_att2＝z2
RF3_att2-RF0_att2＝z3
RF2_att2-RF1_att2＝z4
RF3_att2-RF1_att2＝z5
RF3_att2-RF2_att2＝z6
the above equation set is an overdetermined equation set, the number of equations is greater than the number of unknowns, that is, the physical meaning is that 4 branch ATTs (RF0_ ATT2, RF1_ ATT2, RF2_ ATT2, RF3_ ATT2, 4 solutions in total) are adjusted, and the value of the difference between every two channels (6 equations) cannot be adjusted to be equal to the corresponding reference value at the same time.
Therefore, a method of solving a least square solution by using a matlab program is adopted to solve 4 branch consistency ATT adjustment values RF0_ ATT2, RF1_ ATT2, RF2_ ATT2 and RF3_ ATT2, namely, the adjustment quantity of ATT of each channel is solved, and the square sum of z1 to z6 is minimized.
The above overdetermined equation can be transformed and written as:
RF1_ att2-RF0_ att 2-z 1 is equivalent:
-1*RF0_att2+1*RF1_att2+0*RF2_att2+0*RF3_att2＝z1
RF2_ att2-RF0_ att 2-z 2 is equivalent:
-1*RF0_att2+0*RF1_att2+1*RF2_att2+0*RF3_att2＝z2
RF3_ att2-RF0_ att 2-z 3 is equivalent:
-1*RF0_att2+0*RF1_att2+0*RF2_att2+1*RF3_att2＝z3
RF2_ att2-RF1_ att 2-z 4 is equivalent:
0*RF0_att2-1*RF1_att2+1*RF2_att2+0*RF3_att2＝z4
RF3_ att2-RF1_ att 2-z 5 is equivalent:
0*RF0_att2-1*RF1_att2+0*RF2_att2+1*RF3_att2＝z5
RF3_ att2-RF2_ att 2-z 6 is equivalent:
0*RF0_att2+0*RF1_att2-1*RF2_att2+1*RF3_att2＝z6
extracting coefficients of RF0_ att2, RF1_ att2, RF2_ att2 and RF3_ att2 in all the formulas to obtain a coefficient matrix of the over-determined equation set as A,
B＝[z1；z2；z3；z4；z5；z6]；
the calculation formula of the branch port consistency ATT adjustment value is shown in formula 1:
RF_att2＝lscov(A,B)……(1)
wherein, RF _ ATT2 is a consistency ATT adjustment value vector containing consistency ATT adjustment values for each branch; a is a coefficient matrix of an over-determined equation set, B is a center value vector after difference, the center value vector comprises center values after difference of a plurality of branch gain curves in pairs, and an lscov () function is a matlab function library function.
With B ═ 0.11775; -0.023875; -0.1495; -0.06; -0.2415; taking-0.065 ] as an example, substituting the coefficient matrixes a and B into formula 1 to obtain 4 branch port consistency ATT adjustment values, namely RF _ ATT2 ═ 0.1279; 0.2188, respectively; 0.1093, respectively; 0], i.e., RF0_ att2 ═ 0.1279, RF1_ att2 ═ 0.2188, RF2_ att2 ═ 0.1093, and RF3_ att2 ═ 0.
Although the branch port consistency ATT adjustment value satisfies the total minimum deviation, under the condition that the ATT adjustment value has a limited range, the maximum value or the minimum value of each channel may exceed the preset attenuation difference range of each channel. A weighted correction is required for each channel.
For example: in the case where the difference value between the two channels is [ -0.75,0.75], the maximum value and the minimum value of the difference value (the difference value) between the channel 1 and the channel 2 are respectively: max is 0.282, min is-0.402, the maximum value and the minimum value of the difference value of the channel 1 and the channel 2 are in the range of [ -0.75,0.75] which is preset, and the preset requirement is met.
The maximum and minimum values of the difference values for channel 0 and channel 3 are: max is 0.56625, min is 0.86525, and the minimum value-0.86525 is beyond the preset range of [ -0.75,0.75], and does not meet the preset requirement.
The purpose of performing weighting correction on each channel is to make the maximum value max and the minimum value min after the difference of each channel symmetric about 0 as much as possible. The weighted re-energy preferentially processes channel data that does not meet the requirements, or channel data that is more difficult to meet after adjustment because the peak-to-peak (P-P value) is larger.
For example, without weighting down,
the maximum and minimum values of the difference values for channel 0 and channel 3 are: max is 0.69415, min is-0.73735,
after weighting optimization:
the maximum and minimum values of the difference values for channel 0 and channel 3 are: max is 0.71305, min is-0.71845,
the optimized result is more symmetrical by 0, and the margin from the upper and lower limit boundaries is larger.
The method of the invention adopts the weight coefficient w added in the least square solution to correct the maximum value and the minimum value of the difference value of the two channels, so that the maximum value and the minimum value of the difference value of the two channels are more approximately symmetrical to 0.
In this example, the weight factor w is [ 1; 1; 10; 1; 10; 1], increasing the weight data of two groups of z values with the maximum peak-to-peak value (P-P value), calculating by using a formula (2),
RF_att2’＝lscov(A，B，w)……(2)
wherein, RF _ ATT 2' is a vector of corrected consistency ATT adjustment values, including a corrected consistency ATT adjustment value for each branch; a is a coefficient matrix of an over-determined equation set, B is a center value vector after difference, and comprises center values after difference of a plurality of branch gain curves in pairs, w is a weighting coefficient vector, and comprises adjustment coefficients after difference of the plurality of branch gain curves in pairs, and an lscov () function is a matlab function library function.
Substituting the coefficient matrixes A, B and w into formula 2 to obtain an optimized port consistency ATT (automatic train transfer) adjustment value of the 4 branch band corrections, namely RF _ ATT 2' ═ 0; 0.0917, respectively; -0.0247; -0.1468], i.e. RF0_ att2 '═ 0, RF1_ att 2' ═ 0.0917, RF2_ att2 '═ 0.0247, and RF3_ att 2' ═ 0.1468.
For the result RF0_ att2 '═ 0, RF1_ att 2' ═ 0.0917, RF2_ att2 '═ -0.0247, and RF3_ att 2' ═ -0.1468, since the attenuator has no negative value, all channels are added to a minimum value, so that the attenuation value becomes 0 or a positive value, the end result is RF0_ att2 '═ 0.1468, RF1_ att 2' ═ 0.2385, RF2_ att2 '═ 0.1221, and RF3_ att 2' ═ 0.
And 4, summing the port consistency ATT value of each branch and the calibration ATT value of each branch to obtain a total ATT adjustment value of each branch.
The total ATT adjustment value for each branch can be expressed as:
RF0_att＝RF0_att1+RF0_att2；
RF1_att＝RF1_att1+RF1_att2；
RF2_att＝RF2_att1+RF2_att2；
RF3_att＝RF3_att1+RF3_att2。
and outputting a corresponding voltage value through the MCU and software according to the total ATT adjusting value of each branch, so that the branch meets the set total ATT adjusting value under the control of the voltage-controlled attenuator of each branch, and the consistency calibration of the output port of the whole HFC amplifier is completed.
Claims (8)
1. A method for calibrating multi-port output consistency of an HFC amplifier is characterized by comprising the following steps:
s1, finding out the branch with the minimum gain and the branch with the maximum equalizing quantity from the gain curves of the multiple branches of the HFC amplifier, using the branch with the minimum gain and the branch with the maximum equalizing quantity as a reference basis for adjusting the attenuation value, completing the calibration of the gain values and the equalizing values of the multiple branches, and obtaining the ATT calibration adjustment quantity of the multiple branches;
s2, subtracting every two gain curves of the calibrated multiple branches to obtain a central value after subtraction;
s3, solving the consistency ATT regulating quantity of the plurality of branches by adopting a least square solution method to ensure that the sum of squares of the center values after difference is made is minimum;
s4, summing the calibration ATT regulating quantity of each branch and the consistency ATT regulating quantity of the corresponding branch to obtain the total ATT regulating value of each branch, and controlling the voltage-controlled attenuation quantity of each branch according to the total ATT regulating value of each branch;
the step of S1 includes:
finding out the branch with the minimum gain and the branch with the maximum equalizing quantity from the gain curves of the branches;
taking the branch with the minimum gain as a reference, adjusting ATT calibration values of other branches except the branch with the minimum gain to make gains of the highest frequency points of working frequency bands of all branches consistent, and acquiring ATT calibration adjustment quantity of all branches;
taking the branch with the maximum equalization amount as a reference, and adjusting the equalization amounts of other branches except the branch with the maximum equalization amount to make the equalization amounts of the working frequency bands of the branches consistent;
adjusting ATT values and EQ values of main circuits where the plurality of branches are located, so that downlink gains and EQ reach preset default values;
the step of S3 includes:
s11, presetting a consistency ATT adjusting value of each branch;
s12, establishing an over-determined equation set and extracting a coefficient matrix of the over-determined equation set according to the consistency ATT adjustment value of each branch and the differentiated central value;
and S13, substituting the coefficient matrix of the over-determined equation set and the center value after the difference into the consistency ATT adjustment value calculation formula to obtain the consistency ATT adjustment value of each branch.
2. The HFC amplifier multi-port output consistency calibration method of claim 1, wherein the consistency ATT adjustment value calculation formula is:
RF_att2=lscov(A，B)
wherein, RF _ ATT2 is a consistency ATT adjustment value vector containing consistency ATT adjustment values for each branch; a is a coefficient matrix of the over-determined equation set, B is a differentiated central value vector and comprises central values of a plurality of branch gain curves which are differentiated pairwise, and an lscov () function is a matlab library function.
3. The HFC amplifier multi-port output consistency calibration method of claim 1, wherein in step S3, the corrected consistency ATT adjustment values of the plurality of branches are obtained by using a least square solution method according to the weighting coefficients, so that the sum of squares of the subtracted central values is minimum, and the maximum value and the minimum value of the two-by-two differences of each branch are within a preset range.
4. The HFC amplifier multi-port output consistency calibration method of claim 3, wherein the step of S3 comprises:
s21, presetting a consistency ATT adjusting value of each branch;
s22, establishing an overdetermined equation set and extracting a coefficient matrix of the overdetermined equation set according to the weighting coefficient, the consistency ATT adjustment value of each branch and the differentiated central value;
and S23, substituting the weighting coefficient, the coefficient matrix of the over-determined equation set and the center value after difference into a consistency ATT adjustment value calculation formula with correction to obtain the corrected consistency ATT adjustment value of each branch.
5. The method of claim 4 wherein the weighting coefficients are set based on the maximum and minimum values of the difference between two channels or determined based on the peak-to-peak values of the difference between two channels.
6. The HFC amplifier multi-port output consistency calibration method of claim 5, wherein the corrected consistency ATT adjustment values of the plurality of branches are obtained by a least square solution method according to the weighting coefficients, and the calculation formula of the corrected consistency ATT adjustment values is as follows:
RF_att2’=lscov(A，B，w)
wherein, RF _ ATT 2' is a vector of corrected consistency ATT adjustment values, including a corrected consistency ATT adjustment value for each branch; a is a coefficient matrix of the over-determined equation set, B is a center value vector after difference, and comprises center values after difference of a plurality of branch gain curves in pairs, w is a weighting coefficient vector, and comprises adjustment coefficients after difference of the plurality of branch gain curves in pairs, and the lscov () function is a matlab library function.
7. The method of claim 6, wherein each adjustment coefficient in the weight coefficient vector w takes on a value of 1 or 10.
8. The device for calibrating the multi-port output consistency of the HFC amplifier is characterized by comprising at least one processor and a memory which is in communication connection with the at least one processor; the memory stores instructions executable by the at least one processor to enable the at least one processor to perform the method of any one of claims 1 to 7.
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