CN106209275B - A kind of amplitude modulation class radio-frequency transmitter intermodulation degree of suppression measurement method - Google Patents
A kind of amplitude modulation class radio-frequency transmitter intermodulation degree of suppression measurement method Download PDFInfo
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- CN106209275B CN106209275B CN201610474247.6A CN201610474247A CN106209275B CN 106209275 B CN106209275 B CN 106209275B CN 201610474247 A CN201610474247 A CN 201610474247A CN 106209275 B CN106209275 B CN 106209275B
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Abstract
The present invention relates to a kind of amplitude modulation class radio-frequency transmitter intermodulation degree of suppression measurement methods, step 1: tuning amplitude modulation class radio-frequency transmitter at it and generate normal response in working frequency, extract input signal feature at this time；Step 2: the nonlinear characteristic coefficient a of amplitude modulation class radio-frequency transmitter is extracted using vector network analyzer1And a3Relationship；Step 3: building amplitude modulation class radio-frequency transmitter intermodulation degree of suppression and above-mentioned a1And a3Relational expression, and then obtain amplitude modulation class radio-frequency transmitter intermodulation degree of suppression.The present invention simplifies experiment measuring process, by by signal source, the intermodulation degree of suppression of rapid survey amplitude modulation class radio-frequency transmitter can be realized in vector network analyzer and simple data processing operation, the intermodulation degree of suppression measurement method provided compared to CS105 in GJB151B-2013, the complexity for simplifying measurement, improves measurement efficiency.
Description
Technical field
The present invention relates to a kind of measurement methods of amplitude modulation class radio-frequency transmitter intermodulation degree of suppression, belong to electromagnetic compatibility test neck
Domain.
Background technique
For amplitude modulation class radio-frequency transmitter, due to the particularity of its demodulating received signal mode, in actual use process
In, after there are the front end that the signal of adjacent frequency channel penetrates into receiver, it is more likely that unexpected crossmodulation can be caused to ring
It answers.For this purpose, introducing crossmodulation degree of suppression in the electromagnetic compatibility test for amplitude modulation class radio-frequency transmitter and (referred to as handing over
Adjust degree of suppression) test to measure amplitude modulation class radio frequency receiver to the resistivity of potential monkey chatter.
The measurement method of existing radio frequency amplifier intermodulation degree of suppression is mainly the CS105 in national standard GJB151B-2013,
But the experimentation of this method is relatively complicated, and operating procedure is tediously long.
Summary of the invention
The purpose of the present invention is: overcome the deficiencies in the prior art simplifies experiment measuring process, for amplitude modulation class radio frequency reception
Machine gives a kind of measurement method of new intermodulation degree of suppression.This method can be by by signal source, vector network analysis
The intermodulation degree of suppression of rapid survey amplitude modulation class radio-frequency transmitter can be realized in instrument and simple data processing operation.Compared to
The intermodulation degree of suppression measurement method that CS105 is provided in GJB151B-2013, this process simplify the complexities of measurement, improve survey
Amount efficiency.
The technology of the present invention solution: a kind of intermodulation degree of suppression measurement method of amplitude modulation class radio-frequency transmitter, including it is following
Step:
Step 1: tuning amplitude modulation class radio-frequency transmitter at it and generate normal response in working frequency, extract input at this time
Signal characteristic.
Step 2: the nonlinear characteristic coefficient a of amplitude modulation class radio-frequency transmitter is extracted using vector network analyzer1And a3Pass
System.
Step 3: the relational expression of building amplitude modulation class radio-frequency transmitter intermodulation degree of suppression and above-mentioned parameter, and then obtain and adjust
Width class radio-frequency transmitter intermodulation degree of suppression.
The step 1, specific as follows:
Amplitude modulation class radio-frequency transmitter is tuned to working frequency f1, one then is inputted to this amplitude modulation class radio-frequency transmitter
Modulation degree is m, carrier frequency f1Amplitude-modulated signal, adjust the amplitude size of this input signal, make this amplitude modulation class radio frequency reception
Machine generates normal response R0, extract the amplitude V of amplitude modulated input signal at this time1And modulation degree m this two point feature.
It is specific as follows in the step 2:
It I. can be by measuring amplitude modulation class radio-frequency transmitter X parameter if using non-linear vector network analyzer (NVNA)
Obtain the incidence wave wave variables at its input port and the scattered wave wave variables on output port:
A1,1、B2,1、B2,3；
And then the nonlinear characteristic coefficient a of amplitude modulation class radio-frequency transmitter can be acquired by the above wave variables1And a3:
Wherein Z0For the reference impedance at amplitude modulation class radio-frequency transmitter port.Further, it can obtain:
If the 1dB that can directly measure to obtain amplitude modulation class radio-frequency transmitter increases II. using conventional vector Network Analyzer
Beneficial compression point Vim-1dBOr 3 rank intermodulation section Vim-IP3, and because deriving and can obtain by calculating:
Can further have:
It is specific as follows in the step 3:
It is computed derivation, the intermodulation degree of suppression of following 2 kinds of amplitude modulation class radio-frequency transmitter can be obtained:
I. it is the corresponding intermodulation degree of suppression of radio-frequency transmitter of conventional amplitude-modulated signal (AM modulation) for working signal:
Wherein:
CS: intermodulation degree of suppression is indicated.
a1And a3: indicate the nonlinear characteristic coefficient of amplitude modulation class radio-frequency transmitter, that is, by amplitude modulation class radio-frequency transmitter
When output response is with Fourier expansion, fundamental frequency Fourier space corresponding with 3 subfrequencies in product is responded
Coefficient.
V1And m: the amplitude of input amplitude modulated input signal and the modulation degree of the amplitude modulated input signal are respectively indicated.
II. corresponding for the radio-frequency transmitter that working signal is carrier-suppressed double sideband amplitude-modulated signal (DSBSC modulation)
Intermodulation degree of suppression:
Wherein:
CS: intermodulation degree of suppression is indicated.
a1And a3: indicate the nonlinear characteristic coefficient of amplitude modulation class radio-frequency transmitter, that is, by amplitude modulation class radio-frequency transmitter
When output response is with Fourier expansion, fundamental frequency Fourier space corresponding with 3 subfrequencies in product is responded
Coefficient.
V1And m: the amplitude of input amplitude modulated input signal and the modulation degree of the amplitude modulated input signal are respectively indicated.
Note: here when calculating intermodulation degree of suppression, being calculated mainly for the nonlinearity product deployment analysis within 3 ranks.
Since nonlinearity product amplitudes more than 3 ranks is relatively small, in engineer application, especially in the nonlinear characteristic for considering equipment
When, nonlinearity products more than 3 ranks is often ignored, and also uses this processing mode here.
The advantages of the present invention over the prior art are that:
(1) when measuring the intermodulation degree of suppression of amplitude modulation class radio-frequency transmitter, compared to the side gone out given in GJB151B-2013
Method (CS105), the present invention further simplifies laboratory operating procedures.
(2) when carrying out the test of intermodulation degree of suppression to amplitude modulation class radio-frequency transmitter based on the present invention, data processing method is more
It is simple and fast.In the nonlinear characteristic coefficient a for obtaining amplitude modulation class radio-frequency transmitter1And a3Afterwards, it can be obtained by simple algebraic manipulation
Obtain the intermodulation degree of suppression of amplitude modulation class radio-frequency transmitter.
Detailed description of the invention
Fig. 1 is for being illustrated to wave variables；
Fig. 2 is measurement method flow diagram of the invention.
Specific embodiment
As shown in Fig. 2, The present invention gives a kind of intermodulation degree of suppression measurement method of amplitude modulation class radio-frequency transmitter, this side
Method is to input an amplitude-modulated signal to amplitude modulation class radio-frequency transmitter first, makes amplitude modulation class by adjusting the amplitude of this amplitude-modulated signal
Radio-frequency transmitter generates normal response, extracts the signal characteristics such as amplitude, the modulation degree of this amplitude modulated input signal at this time；Then
The nonlinear characteristic parameters a of amplitude modulation class radio-frequency transmitter is directly acquired by vector network analyzer1And a3Itself is either direct
Obtain a1And a3Ratio.Eventually by the intermodulation degree of suppression of building amplitude modulation class radio-frequency transmitter and the relationship expression of above-mentioned parameter
The amplitude modulation class radio-frequency transmitter intermodulation degree of suppression is sought in formula completion.Steps are as follows for concrete implementation:
Step 1: it tunes amplitude modulation class radio-frequency transmitter at it and generates normal response in working frequency, extract at this time defeated
Enter signal characteristic.For specific expansion, i.e., are as follows: amplitude modulation class radio-frequency transmitter is tuned to working frequency f1, then to this amplitude modulation
It is m, carrier frequency f that class radio-frequency transmitter, which inputs a modulation degree,1Amplitude-modulated signal, adjust the amplitude size of this input signal,
This amplitude modulation class radio-frequency transmitter is set to generate normal response R0, extract the amplitude V of amplitude modulated input signal at this time1And modulation degree m this
Two point features.
Step 2: the relationship of amplitude modulation class radio-frequency transmitter nonlinear characteristic coefficient is extracted by vector network analyzer.This
A relationship can be obtained by using non-linear vector network analyzer, can also by using conventional vector Network Analyzer into
Row obtains.
It I. can be by measuring amplitude modulation class radio-frequency transmitter X parameter if using non-linear vector network analyzer (NVNA)
Obtain the incidence wave wave variables at its input port and the scattered wave wave variables on output port:
A1,1、B2,1、B2,3；
Wherein:
{DCSq}: indicate amplitude modulation class radio-frequency transmitter there are the set of the direct current biasing amount at the port of direct current biasing,
Subscript q indicates the corresponding port numbers of amplitude modulation class radio-frequency transmitter.They can be DC offset voltage, and it is inclined to be also possible to direct current
Electric current is set, is determined with specific reference to actual circuit working state.
A1,1: indicate the direct current biasing at amplitude modulation class radio-frequency transmitter related port to gather { DCSqWhen being configured
At the input port of the receiver, the corresponding incidence wave wave variables in the tuning working frequency of the receiver.
B2,3: the direct current biasing at amplitude modulation class radio-frequency transmitter related port is to gather { DCSqWhen being configured, and
" signal frequency f is inputted at the signal input port of the receiver1, signal strength can make in amplitude modulation class radio-frequency transmitter
Signal output port at generate frequency be f1Signal component reach normal response R0" signal when, connect in amplitude modulation class radio frequency
The signal output port of receipts machine, frequency f1Signal component corresponding to scattered wave wave variables.
B2,3: the direct current biasing at amplitude modulation class radio-frequency transmitter related port is to gather { DCSqWhen being configured, and
" signal frequency f is inputted at the signal input port of amplitude modulation class radio-frequency transmitter1, signal strength can to penetrate in amplitude modulation class
The frequency generated at the signal output port of frequency receiver is f1Signal component reach normal response R0" signal when, in amplitude modulation
The signal output port of class radio-frequency transmitter, frequency 3f1Signal component corresponding to scattered wave wave variables.
As shown in Figure 1, wave variables: relating generally to two kinds of wave variables, incidence wave wave variables and scattered wave wave variables, they divide
It is not denoted as:
Incidence wave wave variables:
Scattered wave wave variables:
In formula and A, B respectively indicate incidence wave wave variables and the change of scattered wave wave on amplitude modulation class radio-frequency transmitter particular port
The basic definition of amount often does refinement to specific interested wave variables by way of introducing footmark in practical application and refers in particular to retouch
It states, than B as mentioned above2,1And B2,3The two scattered wave wave variables, wherein the 1st footmark indicates amplitude modulation class radio frequency reception
The port numbering of machine, the 2nd footmark indicate the overtone order relative to amplitude modulation class radio-frequency transmitter tuning working frequency.V and I points
It Biao Shi not be in the voltage and current at the port, Z0The reference impedance of finger tip mouth.In addition, A, B, V, I here is all made of to be had again
The form of valid value vector.For details, reference can be made to Fig. 1.
And then the nonlinear characteristic coefficient a of the amplitude modulation class radio-frequency transmitter can be acquired by the above wave variables1And a3:
Note: seeking a using non-linear vector network analyzer1And a3When, it is the input of amplitude modulation class radio-frequency transmitter, defeated
Exit port is in impedance matching condition.
Further, it can acquire:
If can directly measure the 1dB gain pressure for obtaining the radio-frequency transmitter II. using conventional vector Network Analyzer
Point reduction Vim-1dBOr 3 rank intermodulation section Vim-IP3.And it derives and can obtain by calculating:
Can further have:
Step 3: the relational expression of building amplitude modulation class radio-frequency transmitter intermodulation degree of suppression and above-mentioned parameter, and then obtain
Amplitude modulation class radio-frequency transmitter intermodulation degree of suppression.By taking conventional amplitude modulation (AM) radio-frequency transmitter as an example, using in GJB151B-2013
The identical experimental principle of CS105 carries out corresponding mathematical modeling derivation, and detailed process is as follows:
Receiver is set to generate standard when only passing through one modulated signal of signal source A input to conventional amplitude modulation (AM) radio-frequency transmitter
Respond R0When, corresponding input signal are as follows:
Vi1=V1·(1+m·cosΩt)·cosω1t；
After the operation of the mixing of receiver, low-pass filtering and blocking, obtained response product are as follows:
The following intermodulation product for seeking receiver, the requirement according to CS105 in GJB151B-2013 to input signal, together
When using signal source A and signal source B to receiver inject input signal, the wherein output of signal source A are as follows:
To make the signal strength of intermodulation product be equal to standard output, when first assuming to meet this condition here, signal source B's is defeated
Out are as follows:
ViB=V2(1+m·cosΩt)·cosω2t；
Correspondingly, before mixing, it due to the nonlinear interaction of receiver preamplifier, can acquire in receiver mixer
Input port at fundamental wave response component are as follows:
The fundamental wave response component is after the operation of the mixing of receiver, low-pass filtering and blocking, obtained intermodulation product
Are as follows:
So to acquire V2, it enables:
Further, it can obtain
If intermodulation degree of suppression is CR, then have:
V2=V1·CR；
Also just have:
So intermodulation degree of suppression can be obtained are as follows:
Carrier-suppressed double sideband amplitude modulation (DSBSC) radio-frequency transmitter can also be used to acquire its intermodulation degree of suppression
The method in face solves to obtain, and the two, which the difference is that only, solves V2The step of on.
For carrier-suppressed double sideband amplitude modulation (DSBSC) radio-frequency transmitter, to acquire V2, it enables:
Further, the intermodulation degree of suppression of carrier-suppressed double sideband amplitude modulation (DSBSC) radio-frequency transmitter can be acquired:
In conjunction with the nonlinear characteristic coefficient a for the receiver that front measures1And a3, so can further obtain:
I. for conventional amplitude modulation (AM) receiver, intermodulation degree of suppression are as follows:
II. for carrier-suppressed double sideband amplitude modulation (DSBSC) receiver, intermodulation degree of suppression are as follows:
For the amplitude modulated radio frequency receiver of other classes, this method can be used and solve its intermodulation degree of suppression, method is identical.
Claims (5)
1. a kind of amplitude modulation class radio-frequency transmitter intermodulation degree of suppression measurement method, it is characterised in that comprise the following steps that
Step 1: tuning amplitude modulation class radio-frequency transmitter at it and generate normal response in working frequency, extract input signal at this time
Feature；
Step 2: the nonlinear characteristic coefficient a of amplitude modulation class radio-frequency transmitter is extracted using vector network analyzer1And a3Relationship,
Wherein a1And a3When respectively indicating the output response of amplitude modulation class radio-frequency transmitter with Fourier expansion, fundamental wave in product is responded
The coefficient of frequency Fourier space corresponding with 3 subfrequencies；
Step 3: building amplitude modulation class radio-frequency transmitter intermodulation degree of suppression and above-mentioned a1And a3Relational expression, and then obtain amplitude modulation
Class radio-frequency transmitter intermodulation degree of suppression；
The step 1, specific as follows:
Amplitude modulation class radio-frequency transmitter is tuned to working frequency f1, a modulation then is inputted to this amplitude modulation class radio-frequency transmitter
Degree is m, carrier frequency f1Amplitude-modulated signal, adjust the amplitude size of this input signal, make this amplitude modulation class radio-frequency transmitter generate
Normal response R0, extract the amplitude V of amplitude modulated input signal at this time1And modulation degree m the two input signal features.
2. amplitude modulation class radio-frequency transmitter intermodulation degree of suppression measurement method according to claim 1, it is characterised in that: the step
It is specific as follows in rapid 2:
Its input is obtained by measuring amplitude modulation class radio-frequency transmitter X parameter if using non-linear vector network analyzer (NVNA)
Incidence wave wave variables at port and the scattered wave wave variables on output port,
A1,1、B2,1、B2,3；
By the above wave variables, i.e. scattered wave wave variables on incidence wave wave variables and output port acquire the amplitude modulation class radio frequency reception
The nonlinear characteristic coefficient a of machine1And a3:
Wherein, Z0For the reference impedance at amplitude modulation class radio-frequency transmitter port, further obtain:
3. amplitude modulation class radio-frequency transmitter intermodulation degree of suppression measurement method according to claim 1, it is characterised in that: the step
It is specific as follows in rapid 2:
If directly measurement obtains the 1dB gain compression point of amplitude modulation class radio-frequency transmitter using conventional vector Network Analyzer
Vim-1dBOr 3 rank intermodulation section Vim-IP3, it is derived by calculating:
Can further have:
4. amplitude modulation class radio-frequency transmitter intermodulation degree of suppression measurement method according to claim 1, it is characterised in that: the step
It is the corresponding intermodulation degree of suppression of radio-frequency transmitter of conventional amplitude-modulated signal (AM modulation) for working signal in rapid 3 are as follows:
Wherein, V1The amplitude of amplitude modulated input signal and the modulation degree of the amplitude modulated input signal are respectively indicated with m.
5. amplitude modulation class radio-frequency transmitter intermodulation degree of suppression measurement method according to claim 1, it is characterised in that: the step
In rapid 3, press down for the corresponding intermodulation of radio-frequency transmitter that working signal is carrier-suppressed double sideband amplitude-modulated signal (DSBSC modulation)
System are as follows:
Wherein, V1The amplitude of amplitude modulated input signal and the modulation degree of the amplitude modulated input signal are respectively indicated with m.
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| US6529844B1 (en) * | 1998-09-02 | 2003-03-04 | Anritsu Company | Vector network measurement system |
| JP2003028904A (en) * | 2001-07-17 | 2003-01-29 | Nippon Hoso Kyokai <Nhk> | Mutual modulated wave measuring device and measuring method |
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