CN115184716B - Carrier difference correction method for electrical performance detection of radio frequency filter or duplexer - Google Patents
Carrier difference correction method for electrical performance detection of radio frequency filter or duplexer Download PDFInfo
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- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
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Abstract
The invention relates to a carrier difference correction method for electrical property detection of a radio frequency filter or a duplexer, which comprises the following steps: connecting a cable on the network analyzer and completing calibration; connecting a gold carrier to a network analyzer, placing gold material on the gold carrier to start measurement, and collecting the current snp as the snp _ GonG; step two: taking down the gold carrier, connecting the gold carrier with the test carrier, placing Huang Jinliao on the test carrier to start measurement, and collecting the current snp as the snp _ GonT; step three: converting the snp _ GonG and the snp _ GonT into a coupling matrix form by a coupling matrix extraction method; the invention can extract the difference between the common test carrier and the gold test carrier, and compensate the difference in real time in the test process to predict the test result of the tested piece on the gold test carrier, thereby realizing the test consistency; the manual board alignment is not needed, the labor cost of the radio frequency filter testing link is reduced, and the testing consistency and accuracy are improved.
Description
Technical Field
The invention belongs to the technical field of testing of radio frequency filters, and particularly relates to a carrier difference correction method for electrical performance detection of a radio frequency filter or a duplexer.
Background
The radio frequency filter comprises a Monoblock filter, an LTCC low temperature co-fired filter, a dielectric waveguide filter, an SAW/BAW/FBAR filter and the like, and is widely applied to communication equipment such as mobile phone terminals, indoor base stations, wi-Fi access points, routers and the like. The performance of the rf filter directly affects the communication quality of the communication device. Therefore, the testing method and the testing precision of the radio frequency filter are concerned.
Generally, the test of the radio frequency filter comprises two parts of appearance detection and electrical property detection, and the required instrument equipment and environment in the electrical property detection process are as follows; comprising a) a vector network analyzer: a meter capable of measuring an electrical property parameter. Generally, the electrical performance parameters of the rf filter are characterized by S-parameters, by which the insertion loss/rejection/return loss/ripple, etc. of the rf filter are evaluated. b) A radio frequency cable: and the cable is used for connecting the network analyzer with the test carrier. c) SMA joint: the radio frequency electrical performance of the device under test can be transmitted through the test carrier onto the radio frequency cable. d) Testing a carrier: is a Printed Circuit Board (PCB) customized for testing, and the tested piece can be placed on the test carrier by soldering or contact, and then the electrical property of the tested piece is tested by the network analyzer. The service life of the test carrier is generally about 10000 times, and the test carrier is usually replaced by a new test carrier every hour during batch test.
Due to objective factors such as the manufacturing process of the PCB, the difference of the SMA joints, and even the amount of soldering tin during SMA welding, the consistency of the test carriers can be affected, so that different test results can be obtained on different test carriers by the same tested piece. In order to overcome the difference between test carriers and ensure the test consistency, a piece of PCB is usually screened in the production and manufacturing process of the filter, and is defined as a gold test carrier to be used as the final reference of the test; in the prior art, a manual plate alignment method is often adopted, and a test carrier is aligned to a gold carrier by adding and subtracting soldering tin to an SMA joint. Requires skilled workers to operate by experience, and has the following disadvantages: low precision, time-consuming operation, high cost and inaccuracy.
Disclosure of Invention
The present invention is directed to a carrier difference correction method for electrical performance detection of a radio frequency filter or a duplexer, so as to solve the problems in the background art.
In order to achieve the purpose, the invention provides the following technical scheme: the carrier difference correction method for electrical property detection of the radio frequency filter or the duplexer comprises the following steps:
the method comprises the following steps: connecting a cable on the network analyzer, and completing calibration; connecting the gold carrier to a network analyzer through a radio frequency cable, placing gold material on the gold carrier, starting measurement, and collecting current snp; is recorded as: snp _ GonG; in the application, huang Jinliao refers to a good product which passes electrical property test, appearance test and aging test, and insertion loss, return loss and out-of-band inhibition indexes all have test margins, namely Huang Jinliao is a product which reaches the indexes through repeated tests, gold materials can be screened out from products of each batch, huang Jinliao is used for representing the good product in the products of the current batch, and the gold materials can also be called gold samples; the gold carrier is a PCB which is screened out in the production and manufacturing process of the filter and is used as a final test reference for overcoming the difference between test carriers and ensuring the test consistency, the production factory and the final client send samples, perform sampling inspection, align indexes and other links, the gold carrier is used for testing to obtain data, once the model of the product is set, the gold carrier is sealed immediately, and the final client performs the test on the sampling inspection of the delivered product through the gold carrier; gold carriers may also be referred to as golden plates; the test material is a product to be detected currently; the test carrier is a test carrier used for current detection;
step two: taking down the gold carrier, connecting the test carrier, placing gold material on the test carrier, starting measurement, and collecting current snp; is recorded as: snp _ GonT;
step three: converting the obtained snp _ GonG and snp _ GonT into a form of a coupling matrix by a coupling matrix extraction method, wherein the form is as follows:
CM_GonG = CM{ snp_GonG }；
CM_GonT = CM{ snp_GonT }；
the difference between the test vehicle and the gold vehicle is defined as follows: Δ -CM _ GandT = CM _ GonG-CM _ GonT;
step four: placing the test material on a test carrier, starting measurement, and collecting the current snp; is recorded as: snp _ TonT; its corresponding coupling matrix is expressed in the form CM _ TonT = CM { snp _ TonT };
step five: compensating the difference delta-CM _ GandT of the obtained test carrier compared with the gold carrier to the result of the test material placed on the test carrier to obtain the predicted result of the test material placed on the gold carrier;
CM_TonG = CM_TonT +Δ-CM_GandT；
reconverting CM _ TonG to S-parameter form, snp _ TonG = CM -1 { CM_TonG }；
Step six: and analyzing the S parameter characteristic value of the snp _ TonG to judge whether the test sample can pass through the gold carrier.
Preferably, the Huang Jinliao is a product part which is repeatedly tested to reach the index, the snp means that the S parameter measured by the network analyzer is stored as an snp file, and n represents the port number of the network analyzer.
Preferably, in step three, CM { · } represents a coupling matrix extraction method, CM _ GonG and CM _ GonT are both M × M matrices, M is related to the order N of the measured filter, and M = N +2.
Preferably, in step five, CM -1 {. Cndot } represents the method of converting the coupling matrix into S parameters.
Compared with the prior art, the invention has the beneficial effects that: the method provided by the invention can extract the difference between the common test carrier and the gold test carrier, and compensate the difference in real time in the test process so as to predict the test result of the tested piece on the gold test carrier and realize the test consistency; the plate alignment is not needed manually, the labor cost of the radio frequency filter testing link is reduced, and the testing consistency and accuracy are improved.
Detailed Description
The technical solutions in the embodiments of the present invention will be clearly and completely described below with reference to the embodiments of the present invention, and it is obvious that the described embodiments are only a part of the embodiments of the present invention, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present invention.
The embodiment provides a technical scheme: the carrier difference correcting method for detecting the electrical performance of the radio frequency filter or the duplexer comprises the following steps:
the method comprises the following steps: connecting a test cable by using a Keysight E5071C network analyzer, configuring test parameters of the network analyzer, counting the number of measurement points to be 801 points, and calibrating by using a Keysight 85093C calibration piece; connecting the golden carrier to a network analyzer through a radio frequency cable, placing the golden material on the golden carrier, starting measurement, and collecting current s2p (in the embodiment, a two-port network analyzer is used, so that an s2p data file is obtained), wherein the s2p comprises four parts s11/s12/s21/s22, and the measurement data at each 801 point is recorded as: s2p _ GonG:
s2p_GonG =
；
step two: taking down the gold carrier, connecting the test carrier, placing gold material on the test carrier, starting measurement, and collecting the current s2p; the s2p includes four parts s11/s12/s21/s22, and the measurement data at each 801 point is expressed as: s2p _ GonT:
s2p_GonT =
；
step three: the obtained s2p _ GonG and s2p _ GonT are converted into the form of a transverse coupling matrix by a coupling matrix extraction method (Ke Xifa is used in this embodiment, and other methods such as a vector fitting method and a least square method can also reach the same conclusion), which are respectively denoted as CM _ GonG and CM _ GonT:
CM_GonG = CM{ s2p_GonG }；
CM_GonT = CM{ s2p_GonT }；
the measured component in this embodiment is a dielectric filter, and the order of the filter is N, so that the coupling matrix expression of the measured component obtained by the coupling matrix extraction method is an N +2 order matrix, as shown below:
here, the difference between the test vehicle and the gold vehicle is defined as: Δ -CM _ GandT:
Δ-CM_GandT = CM_GonG - CM_GonT；
step four: placing the test material on a test carrier, starting measurement, and collecting the current s2p; the s2p includes four parts s11/s12/s21/s22, and the measurement data at each 801 point is expressed as: s2p _ TonT; the method is converted into a form of a transverse coupling matrix through an extraction method of the coupling matrix (Ke Xifa is adopted in the embodiment, and other methods such as a vector fitting method and a least square method can also achieve the same conclusion):
CM_TonT = CM{ s2p_TonT }；
step five: compensating the difference delta-CM _ GandT of the obtained test carrier compared with the gold carrier to the result that the test material is placed on the test carrier, and obtaining the prediction result that the test material is placed on the gold carrier;
CM_TonG = CM_TonT +Δ-CM_GandT；
converting the CM _ TonG in the form of the coupling matrix into the form of S parameters to obtain:
s2p_TonG = CM -1 { CM_TonG }；
s2p _ TonG is the measurement result after the vehicle difference correction;
step six: judging whether the test sample is a PASS material (qualified) or a FAIL material (unqualified) by analyzing the S parameter characteristic value of the S2p _ TonG; the test consistency of using s2p _ TonG to make final judgment is better than that of using s2p _ TonT to make judgment; the gold carrier is aligned with a final client in the process of product trial production, sample delivery and index confirmation by a filter manufacturer, and is also used for final client sampling inspection after product delivery; therefore, it is important that the test material passes or not passes on the gold carrier.
s2p _ TonG includes four parts s11/s12/s21/s22, and for filter products, attention is generally focused on a return loss index of s11/s22 (return loss in a required passband is higher than a set threshold), an insertion loss index of s21 (insertion loss in the required passband is lower than the set threshold), and an out-of-band rejection index (rejection outside the required passband is higher than the set threshold).
In this embodiment, preferably, the S2p means that the S parameter measured by the network analyzer is stored as an snp file, and n represents the port number of the network analyzer.
In this embodiment, preferably, in step three, CM { · } represents a coupling matrix extraction method, CM _ GonG and CM _ GonT are both M × M matrices, M is related to the order N of the filter to be tested, and M = N +2.
In this embodiment, preferably, in step five, CM -1 {. Represents the conversion of the coupling matrix into S parametersThe method of (1).
Although embodiments of the present invention have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (1)
1. The carrier difference correction method for detecting the electrical property of the radio frequency filter or the duplexer is characterized by comprising the following steps of: the method comprises the following steps:
the method comprises the following steps: connecting a cable on the network analyzer, and completing calibration; connecting the gold carrier to a network analyzer through a radio frequency cable, placing gold material on the gold carrier, starting measurement, and collecting current snp; is recorded as: snp _ GonG; huang Jinliao is a good product which passes electrical property test, appearance test and aging test, and has test margins for insertion loss, return loss and out-of-band inhibition index; the gold carrier is a PCB which is screened out in the production and manufacturing process of the filter and is used as a final test reference for overcoming the difference between test carriers and ensuring the test consistency;
step two: taking down the gold carrier, connecting the test carrier, placing gold material on the test carrier, starting measurement, and collecting current snp; is recorded as: snp _ GonT;
step three: converting the obtained snp _ GonG and snp _ GonT into a form of a coupling matrix by a coupling matrix extraction method, wherein the form is as follows:
CM_GonG = CM{ snp_GonG }；
CM_GonT = CM{ snp_GonT }；
the difference between the test vehicle and the gold vehicle is defined as follows: Δ -CM _ GandT = CM _ GonG-CM _ GonT;
step four: placing the test material on a test carrier, starting measurement, and collecting the current snp; is recorded as: snp _ TonT; its corresponding coupling matrix is expressed in the form CM _ TonT = CM { snp _ TonT };
step five: compensating the difference delta-CM _ GandT of the obtained test carrier compared with the gold carrier to the result that the test material is placed on the test carrier to obtain the prediction result that the test material is placed on the gold carrier;
CM_TonG = CM_TonT +Δ-CM_GandT；
reconverting CM _ TonG to S-parameter form, snp _ TonG = CM -1 { CM_TonG }；
Step six: analyzing S parameter characteristic value of the snp _ TonG, and judging whether the test material can pass through the gold carrier;
the snp means that S parameters measured by the network analyzer can be stored as a snp file, and n represents the port number of the network analyzer;
in the third step, CM {. Represents the coupling matrix extraction method, CM _ GonG and CM _ GonT are M × M matrixes, M is related to the order N of the tested filter, and M = N +2;
in step five, CM -1 {. Represents the method for converting the coupling matrix into S parameters.
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