CN115118352A - High-precision calibration method suitable for terminal test fixture - Google Patents
High-precision calibration method suitable for terminal test fixture Download PDFInfo
- Publication number
- CN115118352A CN115118352A CN202211036716.8A CN202211036716A CN115118352A CN 115118352 A CN115118352 A CN 115118352A CN 202211036716 A CN202211036716 A CN 202211036716A CN 115118352 A CN115118352 A CN 115118352A
- Authority
- CN
- China
- Prior art keywords
- jig
- power
- frequency
- signal source
- calibration
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
Images
Classifications
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/10—Monitoring; Testing of transmitters
- H04B17/11—Monitoring; Testing of transmitters for calibration
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/0082—Monitoring; Testing using service channels; using auxiliary channels
- H04B17/0087—Monitoring; Testing using service channels; using auxiliary channels using auxiliary channels or channel simulators
-
- H—ELECTRICITY
- H04—ELECTRIC COMMUNICATION TECHNIQUE
- H04B—TRANSMISSION
- H04B17/00—Monitoring; Testing
- H04B17/20—Monitoring; Testing of receivers
- H04B17/21—Monitoring; Testing of receivers for calibration; for correcting measurements
Landscapes
- Physics & Mathematics (AREA)
- Electromagnetism (AREA)
- Engineering & Computer Science (AREA)
- Computer Networks & Wireless Communication (AREA)
- Signal Processing (AREA)
- Measurement Of Resistance Or Impedance (AREA)
Abstract
The invention discloses a high-precision calibration method suitable for a terminal test fixture, which belongs to the technical field of electronics, and is provided with a signal source, a power meter, a PC (personal computer), a fixture and a substitution module, so that the technical problem of realizing high-precision calibration of the fixture by providing a limited function substitution module consistent with a tested Device (DUT) in physical structure and radio frequency characteristics is solved. The tedious process of repeatedly disassembling the converter in the traditional calibration process is avoided. The substitute module has the characteristic of good universality, and is suitable for any jig with the same specification due to the fact that the calibrated power is an absolute value.
Description
Technical Field
The invention belongs to the technical field of electronics, and particularly relates to a high-precision calibration method suitable for a terminal test fixture.
Background
The jig is a large tool for carpenters, ironmen, pliers, machines, electronic control and other handicraft articles, and is mainly used as a tool for assisting in controlling positions or actions. The jig can be divided into a process assembly type jig, a project test type jig and a circuit board test type jig. The circuit board testing jig mainly comprises an ICT testing jig, an FCT functional jig, an SMT furnace-passing jig, a BGA testing jig and the like.
With the development of information technology and electronic technology, electronic products such as smart phones, tablets, notebook computers, video recorders, mobile communication products and the like are more and more common in life and almost manually necessary. In the production and manufacturing process, the FCT functional jig is required to perform radio frequency characteristic tests on a large number of mobile terminal devices, and the jig and related test components are required to be subjected to error calibration before the tests.
The defects of the prior art are as follows: the mobile terminal antenna interface usually adopts a high-frequency radio frequency switch RFSW, and a jig needs to lead in and lead out a multi-pole test signal through a Probe (Probe). The probe is not convenient to be directly connected to a calibration instrument (a signal source, a power meter and the like), so that the jig is required to be provided with components of the probe-radio frequency connector, each group of components needs to be calibrated before testing, and each channel of each jig has individualized frequency response, so that each channel of different jigs needs to be calibrated respectively to obtain individualized calibration data. Therefore, a large amount of complicated calibration actions are needed before each test, once a certain link in calibration makes a mistake, the whole calibration needs to be carried out again, and the improvement of the measurement efficiency is not facilitated.
Disclosure of Invention
The invention aims to provide a high-precision calibration method suitable for a terminal test fixture, and solves the technical problem of realizing high-precision calibration of the fixture by providing a limited function replacing module which is consistent with a tested Device (DUT) in physical structure and radio frequency characteristics.
In order to realize the purpose, the invention adopts the following technical scheme: a high-precision calibration method suitable for a terminal test fixture comprises the following steps:
step 1: arranging a signal source, a power meter, a PC (personal computer), a jig and a substitution module, and respectively connecting the PC with the power meter and the signal source;
step 2: calibrating a signal source and a standard cable by using a power meter;
and 3, step 3: measuring the frequency response characteristics of the jig and the related test components by using a power meter and a signal source, and storing the frequency response characteristics in a PC (personal computer);
and 4, step 4: loading a substitution module in the jig, measuring the power of each transmitting port of the jig by using a power meter, calculating the frequency response characteristic of a related test component, adjusting the output frequency of a two-way output phase-locked loop (PLL) and a numerical control attenuator (DSA) in the substitution module, and calibrating the frequency and the power of each channel radio-frequency signal at a radio-frequency switch (RFSW) of the substitution module, namely completing transmitting calibration;
and 5: using a signal source to count the frequency response of a related test component, selecting any channel of a jig as a standard channel, injecting a calibrated frequency and power signal into the standard channel, adjusting a Mixer in a substitution module, tuning a test frequency to an intermediate frequency in a superheterodyne mode for sampling and digitalization, and storing the calibration data into a storage device Flash of the substitution module;
and sequentially injecting signals with fixed power and different frequencies after calibration into the rest channels of the jig, sampling in a superheterodyne mode, calculating the relative difference value of each channel data and the standard channel, and storing the relative difference value into a storage device Flash of the substitution module to finish the calibration of the receiving channel of the substitution module.
Preferably, when step 2 is executed, the method specifically includes the following steps:
step S2-1: directly connecting a signal source with a power meter, and carrying out frequency and power calibration on a signal sent by the signal source by using the power meter to generate a signal source calibration result;
step S2-2: disconnecting the signal source and the power meter, connecting the signal source with the power meter through a standard cable, and performing frequency and power calibration on a signal sent by the signal source by using the power meter to generate a standard cable response frequency calibration result;
step S2-3: and respectively recording the signal source calibration result and the standard cable response frequency calibration result by utilizing a PC (personal computer).
Preferably, when step 3 is executed, the method specifically includes the following steps:
step S3-1: calibrating the frequency power of the emission channel of the jig, specifically comprising disconnecting the power meter, the signal source and the jig, connecting the power meter with the jig through a test cable assembly, connecting a probe Prode in the jig with the signal source through a converter Adapter and a standard cable, measuring the frequency response characteristics of the jig and related test assemblies by using the power meter, and storing the frequency response characteristics in a PC (personal computer);
step S3-2: the method comprises the steps of disconnecting a power meter and the connection between a signal source and the jig, connecting the signal source to the jig through a testing cable assembly, connecting a probe Prode in the jig to the power meter through a converter Adapter and a standard cable, measuring the frequency response characteristics of the jig and a related testing assembly by using the power meter, and storing the frequency response characteristics in a PC (personal computer).
Preferably, when step 4 is executed, the method specifically includes the following steps:
step S4-1: disconnecting the power meter, the signal source and the jig, and connecting the power meter with the jig through the test cable assembly;
step S4-2: selecting a transmitting channel in a substitution module, configuring a calibration frequency through a double-output phase-locked loop PLL, setting an initial attenuation value of a numerical control attenuator DSA, reading power counting data and correcting to obtain a corrected value, and calculating a difference value between the corrected value and a target power through a formula 1:
round [ (target power-correction value)/0.25 ]; (formula 1)
Step S4-3: adjusting the attenuation value to enable the target difference value-the corrected value after coarse adjustment to be less than 0.25 dB;
step S4-4: all transmission channels are scaled according to the methods of step S4-2 and step S4-3.
Preferably, when step 5 is executed, the method specifically includes the following steps:
step S5-1: disconnecting the power meter, the signal source and the jig, and connecting the signal source with the jig through the test cable assembly;
step S5-2: one receiving channel in the replacement module is used as a standard channel;
step S5-3: setting a signal source and a dual-output phase-locked loop PLL to a frequency point to be calibrated;
step S5-4: correcting errors according to the frequency response characteristics of the jig and the related test components;
step S5-5: setting a signal source to a power to be calibrated, and recording a digital detection value measured by a power detector DETD in the alternative touch mode;
step S5-6: marking and calibrating all frequency points to be calibrated according to the method from the step S5-3 to the step S5-5;
step S5-7: the other channels except the standard channel only carry out frequency calibration, and the power calibration carries out error calculation by taking the standard channel as a reference and applies to all the calibrated power values.
Preferably, the substitution module comprises a two-way output phase-locked loop PLL, a numerical control attenuator DSA, a radio frequency switch RFSW, a temperature compensation circuit TEMP, a first amplification circuit AMP1, a first amplification circuit AMP2, a filter BPF, a Mixer, a power detector DETD, an analog-to-digital converter ADC, a storage device Flash and a single-chip microcomputer MCU, wherein the two-way output phase-locked loop PLL is connected with the single-chip microcomputer MCU, the two-way output phase-locked loop PLL is further connected with the numerical control attenuator DSA and the Mixer, the numerical control attenuator DSA is connected with the radio frequency switch RFSW, the radio frequency switch RFSW externally outputs multi-path radio frequency signals, the radio frequency switch RFSW also receives multi-path external radio frequency signals, the radio frequency switch RFSW is further connected with the first amplification circuit AMP1, the first amplification circuit AMP1 is connected with the Mixer, the Mixer AMP2 is connected with the first amplification circuit, the first amplification circuit 2 is connected with the filter BPF, the filter BPF is connected with the power detector DETD, and the power detector is connected with the analog-to the AMP/digital converter ADC, the analog-to-digital converter ADC is connected with the single chip microcomputer MCU, the temperature compensation circuit TEMP is used for measuring temperature signals at the positions of the two-way output phase-locked loop PLL and the power detector DETD, and the storage device Flash is connected with the single chip microcomputer MCU.
Preferably, the related testing components include a jig input connector, a jig internal connection cable, a converter Adapter and a probe Prode.
The invention relates to a high-precision calibration method suitable for a terminal test fixture, which solves the technical problem of providing a limited function substitution module consistent with a tested Device (DUT) in physical structure and radio frequency characteristics to realize high-precision calibration of the fixture. The tedious process of repeatedly disassembling the converter in the conventional calibration process is avoided. The replacing module has the characteristic of good universality, and the calibrated power is an absolute value and is suitable for jigs with any same specification. For a multipole channel, a relative error method is adopted, only two dimensions of frequency and power are calibrated for a standard channel, and only one dimension of frequency is calibrated for the other channels, so that the calibration time is greatly shortened.
Drawings
FIG. 1 is a schematic block diagram of an alternative module of the present invention;
FIG. 2 is a flow chart of the signal source, standard cable, fixture and assembly frequency response measurement calibration of the present invention;
FIG. 3 is a connection diagram of signal source frequency response measurements of the present invention;
FIG. 4 is a connection diagram of a standard cable frequency response measurement of the present invention;
FIG. 5 is a connection diagram of the calibration of the frequency power of the emission channel of the jig of the present invention;
FIG. 6 is a connection diagram of the fixture receiving channel frequency power calibration of the present invention;
FIG. 7 is a flow chart of an alternate module transmit channel scaling of the present invention;
FIG. 8 is a flow chart of an alternate module receive channel scaling of the present invention;
FIG. 9 is an alternate module receive channel scaling connection diagram of the present invention;
fig. 10 is an alternate module transmit channel calibration connection of the present invention.
Detailed Description
The high-precision calibration method for the terminal test fixture shown in fig. 1-10 includes the following steps:
step 1: arranging a signal source, a power meter, a PC (personal computer), a jig and a substitution module, and respectively connecting the PC with the power meter and the signal source;
and 2, step: calibrating a signal source and a standard cable by using a power meter;
when step 2 is executed, the method specifically comprises the following steps:
step S2-1: directly connecting a signal source with a power meter, and carrying out frequency and power calibration on a signal sent by the signal source by using the power meter to generate a signal source calibration result;
step S2-2: disconnecting the signal source and the power meter, connecting the signal source with the power meter through a standard cable, and performing frequency and power calibration on a signal sent by the signal source by using the power meter to generate a standard cable response frequency calibration result;
step S2-3: and respectively recording the signal source calibration result and the standard cable response frequency calibration result by utilizing a PC computer.
In this embodiment, Pow _ SIG is the power displayed by the screen of the signal source itself, and Pow _ DETE is the power displayed by the screen of the power meter itself, as shown in fig. 2, the specific process of step 2 is as follows:
signal source frequency power calibration:
the error from the calibration was recorded as Err _ SIG = Pow _ SIG-Pow _ DETE, and the connection is shown in fig. 3.
2-a. standard cable frequency response calibration
The error from the calibration is recorded as Err _ cable = Pow _ SIG-Err _ SIG-Pow _ DETE, see fig. 4.
And step 3: measuring the frequency response characteristics of the jig and the related test components by using a power meter and a signal source, and storing the frequency response characteristics in a PC (personal computer);
when step 3 is executed, the method specifically comprises the following steps:
step S3-1: calibrating the frequency power of the emission channel of the jig, specifically comprising disconnecting the power meter, the signal source and the jig, connecting the power meter with the jig through a test cable assembly, connecting a probe Prode in the jig with the signal source through a converter Adapter and a standard cable, measuring the frequency response characteristics of the jig and related test assemblies by using the power meter, and storing the frequency response characteristics in a PC (personal computer);
step S3-2: the method comprises the steps of calibrating the frequency power of a receiving channel of a jig, namely disconnecting a power meter, connecting a signal source and the jig, connecting the signal source to the jig through a testing cable assembly, connecting a probe prod in the jig to the power meter through a converter Adapter and a standard cable, measuring the frequency response characteristics of the jig and a related testing assembly by using the power meter, and storing the frequency response characteristics in a PC (personal computer).
In this embodiment, as shown in fig. 2, the specific flow of step 3 is as follows:
3-a. calibration of frequency power of emission channel of jig
The error from the calibration was recorded as:
err _ TX _ texture = Pow _ SIG-Err _ SIG-Pow _ DETE + Err _ cable, see fig. 5 for a connection diagram.
3-b, calibration of frequency power of receiving channel of jig
The error from the calibration was recorded as:
err _ RX _ texture = Pow _ SIG-Err _ SIG-Pow _ DETE + Err _ cable, see fig. 6 for a connection diagram.
And repeating the steps 3-a and 3-d, and measuring the frequency response of each channel of the jig and the test cable assembly.
And 4, step 4: loading a substitution module in the jig, measuring the power of each transmitting port of the jig by using a power meter, calculating the frequency response characteristic of a related test component, adjusting the output frequency of a two-way output phase-locked loop (PLL) and a numerical control attenuator (DSA) in the substitution module, and calibrating the frequency and the power of each channel radio-frequency signal at a radio-frequency switch (RFSW) of the substitution module, namely completing transmitting calibration;
when step 4 is executed, the method specifically comprises the following steps:
step S4-1: disconnecting the power meter, the signal source and the jig, and connecting the power meter with the jig through the test cable assembly;
step S4-2: selecting a transmitting channel in a substitution module, configuring a calibration frequency through a double-output phase-locked loop PLL, setting an initial attenuation value of a numerical control attenuator DSA, reading power counting data and correcting to obtain a corrected value, and calculating a difference value between the corrected value and a target power through a formula 1:
round [ (target power-correction value)/0.25 ]; (formula 1)
Step S4-3: adjusting the attenuation value to enable the target difference value-the corrected value after coarse adjustment to be less than 0.25 dB;
step S4-4: all transmission channels are scaled according to the methods of step S4-2 and step S4-3.
In this embodiment, the specific steps of step 4 are as follows:
configuring a scaling frequency.
Set DSA attenuation value to 0.
And 4-c, reading the power meter display screen display value, and counting Err _ RX _ fix for correction.
And 4-d, calculating the difference value between the correction value and the target power through the formula 1, and performing coarse adjustment.
Equation 1: round [ (target power-correction value)/0.25 ].
And 4-e, judging whether the target difference value-the corrected value after the coarse adjustment is less than 0.25 dB.
4-f. "no": the attenuation value of the DSA is further increased by stepping by 0.25dB, and then the judgment of the step 4-e is carried out.
4-g. "is": and judging whether all the frequency points are calibrated.
4-h. "no": and returning to the step 4-a to calibrate the next frequency point.
4-i. "is": the scaling of the channel is completed.
And 4-j, repeating the steps 4-a to 4-i to finish the calibration of all the transmitting channels.
And 5: using a signal source to count the frequency response of a related test component, selecting any channel of a jig as a standard channel, injecting a calibrated frequency and power signal into the standard channel, adjusting a Mixer in a substitution module, tuning a test frequency to an intermediate frequency in a superheterodyne mode for sampling and digitalization, and storing the calibration data into a storage device Flash of the substitution module;
the related testing assembly includes a jig input connector, a jig internal connection cable, a converter Adapter and a probe Prode, which are prior art, and thus will not be described in detail.
And sequentially injecting signals with fixed power and different frequencies after calibration into the rest channels of the jig, sampling in a superheterodyne mode, calculating the relative difference value of each channel data and the standard channel, and storing the relative difference value into a storage device Flash of the substitution module to finish the calibration of the receiving channel of the substitution module.
When step 5 is executed, the method specifically comprises the following steps:
step S5-1: disconnecting the power meter, the signal source and the jig, and connecting the signal source with the jig through the test cable assembly;
step S5-2: one receiving channel in the replacement module is used as a standard channel;
step S5-3: setting a signal source and a dual-output phase-locked loop PLL to a frequency point to be calibrated;
step S5-4: correcting errors according to the frequency response characteristics of the jig and the related test components;
step S5-5: setting a signal source to a power to be calibrated, and recording a digital detection value measured by a power detector DETD in the alternative touch mode;
step S5-6: marking and calibrating all frequency points to be calibrated according to the method from the step S5-3 to the step S5-5;
step S5-7: the other channels except the standard channel only carry out frequency calibration, and the power calibration carries out error calculation by taking the standard channel as a reference and applies to all the calibrated power values.
In this embodiment, the specific process of step 5 is as follows:
and 5-a, selecting one of the receiving channels as a standard channel.
And 5-b, setting a signal source and a two-way output phase-locked loop PLL to a calibration frequency point.
5-c. count Err _ SIG and Err _ RX _ fix.
And 5-d, setting the signal source to the power to be calibrated.
And 5-e, recording the digital wave detection value.
And 5-f, judging whether all power calibration is finished.
5-g. "no": and setting the power of the signal source to the next power to be calibrated.
5-h. "is": and judging whether all frequency calibration is finished or not.
5-i. "No": and the signal source and the dual-output phase-locked loop PLL reach the next frequency to be calibrated.
5-j. "is": standard channel scaling is done.
And 5-k, only carrying out frequency dimension calibration on the rest receiving channels, and carrying out error calculation on the power dimension by taking the standard channel as a reference and applying the error calculation to all calibration power values.
The replacing module comprises a two-way output phase-locked loop PLL, a numerical control attenuator DSA, a radio frequency switch RFSW, a temperature compensating circuit TEMP, a first amplifying circuit AMP1, a first amplifying circuit AMP2, a filter BPF, a Mixer Mixer, a power detector DETD, an analog-to-digital converter ADC, a storage device Flash and a single chip MCU, wherein the two-way output phase-locked loop PLL is connected with the single chip MCU, the two-way output phase-locked loop PLL is also respectively connected with the numerical control attenuator DSA and the Mixer, the numerical control attenuator DSA is connected with the radio frequency switch RFSW, the radio frequency switch RFSW externally outputs multi-path radio frequency signals, meanwhile, the radio frequency switch RFSW also receives multi-path external radio frequency signals, the radio frequency switch RFSW is also connected with a first amplifying circuit 1, the first amplifying circuit AMP1 is connected with the Mixer Mixer AMP2, the first amplifying circuit AMP2 is connected with the first amplifying circuit, the first amplifying circuit 2 is connected with the filter BPF, the filter BPF is connected with the filter DETD, the power detector DETD, and the power detector DETD is connected with the analog-to the A/digital converter ADC, the analog-to-digital converter ADC is connected with the single chip microcomputer MCU, the temperature compensation circuit TEMP is used for measuring temperature signals at the positions of the double-output phase-locked loop PLL and the power detector DETD, and the storage device Flash is connected with the single chip microcomputer MCU.
The substitution module forms a transmitting path by a double-output phase-locked loop PLL with a power control function, a numerical control attenuator DSA and a radio frequency switch RFSW; and the receiving link consists of a two-way output phase-locked loop PLL with a power control function, an amplifying circuit AMP with a bypass function, a first amplifying circuit AMP1, a first amplifying circuit AMP2, a filter BPF, a Mixer, a power detector DETD and an analog-digital converter ADC.
In this embodiment, the rf switch RFSW may include a plurality of rf switches, which are responsible for selecting the receiving path and the transmitting path.
The digital control attenuator DSA has the performance of 0.25dB stepping and 31dB adjusting range, can achieve the transmitting power adjusting range of 31dB and 0.1dB precision by matching with a double-output phase-locked loop PLL with a power control function, and has good temperature stability within 0-50 ℃ through a temperature compensation circuit TEMP.
Through a superheterodyne mode, a filter BPF with the suppression degree larger than 60dB can provide a pure intermediate frequency spectrum for a broadband detector, and the measurement accuracy of +/-0.005 dB can still be provided when a small signal of-40 dBm is received; an RMS detector with the dynamic measurement of 50dB is adopted, and a 20dB gain amplifier with a bypass function is matched, so that the dynamic measurement of 70dB can be realized; the temperature compensation circuit TEMP of the receiving channel provides good temperature stability for the module within 0-50 ℃.
The invention relates to a high-precision calibration method suitable for a terminal test fixture, which solves the technical problem of realizing high-precision calibration of the fixture by providing a limited function substitution module which is consistent with a tested device DUT on the physical structure and radio frequency characteristics. The tedious process of repeatedly disassembling the converter in the traditional calibration process is avoided. The replacing module has the characteristic of good universality, and the calibrated power is an absolute value and is suitable for jigs with any same specification. For a multipole path, a relative error method is adopted, only two dimensions of frequency and power are calibrated on a standard channel, and the other channels are calibrated on one dimension of frequency, so that the calibration time is greatly shortened.
Claims (7)
1. A high-precision calibration method suitable for a terminal test fixture is characterized by comprising the following steps: the method comprises the following steps:
step 1: arranging a signal source, a power meter, a PC (personal computer), a jig and a substitution module, and respectively connecting the PC with the power meter and the signal source;
step 2: calibrating a signal source and a standard cable by using a power meter;
and step 3: measuring the frequency response characteristics of the jig and the related test components by using a power meter and a signal source, and storing the frequency response characteristics in a PC (personal computer);
and 4, step 4: loading a substitution module in the jig, measuring the power of each transmitting port of the jig by using a power meter, calculating the frequency response characteristic of a related test component, adjusting the output frequency of a two-way output phase-locked loop (PLL) and a numerical control attenuator (DSA) in the substitution module, and calibrating the frequency and the power of each channel radio-frequency signal at a radio-frequency switch (RFSW) of the substitution module, namely completing transmitting calibration;
and 5: using a signal source to count the frequency response of a related test component, selecting any channel of a jig as a standard channel, injecting a calibrated frequency and power signal into the standard channel, adjusting a Mixer in a substitution module, tuning a test frequency to an intermediate frequency in a superheterodyne mode for sampling and digitalization, and storing the calibration data into a storage device Flash of the substitution module;
and sequentially injecting signals with fixed power and different frequencies after calibration into the rest channels of the jig, sampling in a superheterodyne mode, calculating the relative difference value of each channel data and the standard channel, and storing the relative difference value into a storage device Flash of the substitution module to finish the calibration of the receiving channel of the substitution module.
2. The method as claimed in claim 1, wherein the calibration method comprises: the related test assembly comprises a jig input connector, a jig internal connecting cable, a converter Adapter and a probe Prode.
3. The method as claimed in claim 1, wherein the calibration method comprises:
when step 2 is executed, the method specifically comprises the following steps:
step S2-1: directly connecting a signal source with a power meter, and carrying out frequency and power calibration on a signal sent by the signal source by using the power meter to generate a signal source calibration result;
step S2-2: disconnecting the signal source and the power meter, connecting the signal source with the power meter through a standard cable, and performing frequency and power calibration on a signal sent by the signal source by using the power meter to generate a standard cable response frequency calibration result;
step S2-3: and respectively recording the signal source calibration result and the standard cable response frequency calibration result by utilizing a PC (personal computer).
4. The method as claimed in claim 2, wherein the calibration method comprises: when step 3 is executed, the method specifically comprises the following steps:
step S3-1: calibrating the frequency power of the emission channel of the jig, specifically comprising disconnecting the power meter, the signal source and the jig, connecting the power meter with the jig through a test cable assembly, connecting a probe Prode in the jig with the signal source through a converter Adapter and a standard cable, measuring the frequency response characteristics of the jig and related test assemblies by using the power meter, and storing the frequency response characteristics in a PC (personal computer);
step S3-2: the method comprises the steps of calibrating the frequency power of a receiving channel of a jig, namely disconnecting a power meter, connecting a signal source and the jig, connecting the signal source to the jig through a testing cable assembly, connecting a probe prod in the jig to the power meter through a converter Adapter and a standard cable, measuring the frequency response characteristics of the jig and a related testing assembly by using the power meter, and storing the frequency response characteristics in a PC (personal computer).
5. The method as claimed in claim 1, wherein the calibration method comprises: when step 4 is executed, the method specifically comprises the following steps:
step S4-1: disconnecting the power meter, the signal source and the jig, and connecting the power meter with the jig through the test cable assembly;
step S4-2: selecting a transmitting channel in a substitution module, configuring a calibration frequency through a double-output phase-locked loop PLL, setting an initial attenuation value of a numerical control attenuator DSA, reading power counting data and correcting to obtain a corrected value, and calculating a difference value between the corrected value and a target power through a formula 1:
round [ (target power-correction value)/0.25 ]; (formula 1)
Step S4-3: adjusting the attenuation value to enable the target difference value-the corrected value after coarse adjustment to be less than 0.25 dB;
step S4-4: all transmission channels are scaled according to the methods of step S4-2 and step S4-3.
6. The method as claimed in claim 1, wherein the calibration method comprises: when step 5 is executed, the method specifically comprises the following steps:
step S5-1: disconnecting the power meter, the signal source and the jig, and connecting the signal source with the jig through the test cable assembly;
step S5-2: one receiving channel in the replacement module is used as a standard channel;
step S5-3: setting a signal source and a dual-output phase-locked loop PLL to a frequency point to be calibrated;
step S5-4: correcting errors according to the frequency response characteristics of the jig and the related test components;
step S5-5: setting a signal source to a power to be calibrated, and recording a digital detection value measured by a power detector DETD in the alternative touch mode;
step S5-6: marking and calibrating all frequency points to be calibrated according to the method from the step S5-3 to the step S5-5;
step S5-7: the other channels except the standard channel only carry out frequency calibration, and the power calibration carries out error calculation by taking the standard channel as a reference and applies to all the calibrated power values.
7. The method as claimed in claim 1, wherein the calibration module further comprises: the replacing module comprises a two-way output phase-locked loop PLL, a numerical control attenuator DSA, a radio frequency switch RFSW, a temperature compensating circuit TEMP, a first amplifying circuit AMP1, a first amplifying circuit AMP2, a filter BPF, a Mixer Mixer, a power detector DETD, an analog-to-digital converter ADC, a storage device Flash and a single-chip microcomputer MCU, wherein the two-way output phase-locked loop PLL is connected with the single-chip microcomputer MCU, the two-way output phase-locked loop PLL is also respectively connected with the numerical control attenuator DSA and the Mixer, the numerical control attenuator DSA is connected with the radio frequency switch RFSW, the radio frequency switch RFSW externally outputs multi-path radio frequency signals, meanwhile, the radio frequency switch RFSW also receives multi-path external radio frequency signals, the radio frequency switch RFSW is also connected with a first amplifying circuit AMP1, the first amplifying circuit AMP1 is connected with the Mixer Mixer AMP 3624, the Mixer is connected with the first amplifying circuit AMP2, the first amplifying circuit 2 is connected with the filter BPF, the filter BPF is connected with the power detector DETD, the power detector is connected with the analog-to the A/digital converter ADC, the analog-to-digital converter ADC is connected with the single chip microcomputer MCU, the temperature compensation circuit TEMP is used for measuring temperature signals at the positions of the two-way output phase-locked loop PLL and the power detector DETD, and the storage device Flash is connected with the single chip microcomputer MCU.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211036716.8A CN115118352B (en) | 2022-08-29 | 2022-08-29 | High-precision calibration method suitable for terminal test fixture |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202211036716.8A CN115118352B (en) | 2022-08-29 | 2022-08-29 | High-precision calibration method suitable for terminal test fixture |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN115118352A true CN115118352A (en) | 2022-09-27 |
| CN115118352B CN115118352B (en) | 2022-11-01 |
Family
ID=83335959
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202211036716.8A Active CN115118352B (en) | 2022-08-29 | 2022-08-29 | High-precision calibration method suitable for terminal test fixture |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN115118352B (en) |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6127966A (en) * | 1997-05-16 | 2000-10-03 | Telefonaktiebolaget Lm Ericsson | Method and device for antenna calibration |
| CN107703360A (en) * | 2017-09-15 | 2018-02-16 | 郑州云海信息技术有限公司 | A kind of impedance test system and method for server complete signal link |
| CN109343576A (en) * | 2018-11-13 | 2019-02-15 | Oppo广东移动通信有限公司 | Calibration system and calibration jig |
| CN110031689A (en) * | 2019-05-08 | 2019-07-19 | 深圳沸石智能技术有限公司 | A kind of antenna measurement device and method |
-
2022
- 2022-08-29 CN CN202211036716.8A patent/CN115118352B/en active Active
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6127966A (en) * | 1997-05-16 | 2000-10-03 | Telefonaktiebolaget Lm Ericsson | Method and device for antenna calibration |
| CN107703360A (en) * | 2017-09-15 | 2018-02-16 | 郑州云海信息技术有限公司 | A kind of impedance test system and method for server complete signal link |
| CN109343576A (en) * | 2018-11-13 | 2019-02-15 | Oppo广东移动通信有限公司 | Calibration system and calibration jig |
| CN110031689A (en) * | 2019-05-08 | 2019-07-19 | 深圳沸石智能技术有限公司 | A kind of antenna measurement device and method |
Also Published As
| Publication number | Publication date |
|---|---|
| CN115118352B (en) | 2022-11-01 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN108802510B (en) | Integrated noise parameter measuring device and measuring method | |
| US20110301905A1 (en) | Methods for calibration of radio-frequency path loss in radio-frequency test equipment | |
| CN110572223B (en) | Calibration method of radio frequency baseband integrated terminal automatic test system | |
| CN108802651B (en) | Online correction device and correction method for temperature drift of noise coefficient analyzer | |
| CN114156982B (en) | BMS system zero drift compensation circuit and method | |
| CN115118352B (en) | High-precision calibration method suitable for terminal test fixture | |
| Hsieh et al. | Integrated CMOS power sensors for RF BIST applications | |
| CN110470973B (en) | Automatic on-chip test system for noise coefficient of low-noise amplifier chip | |
| CN110763977B (en) | System and method for quantitatively measuring and evaluating precision of noise test system | |
| CN107294617B (en) | Receiver noise coefficient correction method based on Y factor method | |
| CN113466774A (en) | System and method for realizing automatic calibration of frequency spectrograph power under condition of adapting to ADC linear characteristic | |
| CN113325237A (en) | Radio frequency impedance measuring method | |
| US6969985B2 (en) | Active coupler | |
| CN112051532A (en) | Intermediate frequency calibration method based on vector network analyzer | |
| CN112485739B (en) | Method for realizing rapid power calibration processing aiming at multi-port vector network analyzer | |
| CN112067914A (en) | Method for correcting error introduced by extra network in noise coefficient measurement | |
| CN112530825B (en) | On-chip multi-parameter measuring device | |
| CN116418416A (en) | Noise temperature test method suitable for OTA test | |
| CN113126014B (en) | Calibration system for realizing array parallelism of digital oscilloscope | |
| CN117375736B (en) | Differential mode injection test method and system for electromagnetic compatibility sensitivity test | |
| CN113534034B (en) | Method for calibrating transmission amplitude of on-chip S parameter standard device | |
| CN215835403U (en) | Frequency multiplication and mixing pre-amplification module test platform | |
| CN216013630U (en) | System for realizing automatic calibration of frequency spectrograph power under condition of adapting to ADC linear characteristic | |
| Hur et al. | Automated wideband test system, measurement uncertainty, and design of on-chip six-port reflectometers for 5G applications | |
| CN220040733U (en) | System for calibrating noise coefficient |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |