CN109030979A - A kind of method of scalar network analyzer and signal generator accurate synchronization frequency sweep - Google Patents
A kind of method of scalar network analyzer and signal generator accurate synchronization frequency sweep Download PDFInfo
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- CN109030979A CN109030979A CN201810577955.1A CN201810577955A CN109030979A CN 109030979 A CN109030979 A CN 109030979A CN 201810577955 A CN201810577955 A CN 201810577955A CN 109030979 A CN109030979 A CN 109030979A
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- network analyzer
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R31/00—Arrangements for testing electric properties; Arrangements for locating electric faults; Arrangements for electrical testing characterised by what is being tested not provided for elsewhere
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Abstract
The present invention provides a kind of methods of scalar network analyzer and signal generator accurate synchronization frequency sweep, including signal generator and scalar network analyzer, signal generator passes through the first BNC cable, the 2nd BNC cable and cable respectively and is connected with scalar network analyzer.It is specifically divided into the following steps: sweep parameters is set on scalar network analyzer, parameters are sent to signal generator by cable；After signal generator receives sweep parameters, start frequency sweep, signal generator is sent beginning/stopping scanning signal to scalar network analyzer by the first BNC cable, and signal generator is sent scanning pulse signal to scalar network analyzer by the 2nd BNC cable；Scalar network analyzer handles the beginning/stopping scanning signal and scanning pulse signal that signal generator issues；In the case where not changing sweep parameters, above-mentioned frequency sweep process is continued.This method can synchro measure that is simple, being accurately realized swept signal generator and scalar network analyzer.
Description
Technical field
The present invention relates to scalar network analyzer frequency sweep synchronous with signal generator fields, and in particular to a kind of scalar network
The method of analyzer and signal generator accurate synchronization frequency sweep.
Background technique
Scalar network analyzer has the characteristics that at low cost, easy to operate, scalar network analyzer and swept-frequency signal generation
Device cooperation, can fast and accurately carry out transmission measurement, return loss and port SWR measurement, by the way that different frequency range is coupled
Wave detector, electric bridge and directional coupler, user can be met in the testing requirement of different frequency range.
The current existing scalar network analyzer scheme synchronous with swept signal generator frequency sweep is as shown in Figure 1, pass through 4
Root control line connects scalar network analyzer and swept signal generator, realizes that frequency sweep is synchronous.
It is illustrated in figure 2 existing scalar network analyzer and swept signal generator frequency sweep synchronous sequence schematic diagram.
The effect of 4 control lines is respectively as follows:
(1) start scan control line: connect the beginning scan interface of swept signal generator, start single pass it
Before, swept signal generator issues " starting to scan " instruction and is ready to after scalar network analyzer is connected to " starting to scan " instruction
Sweep measurement work, and send one " confirmation " instruction and arrive swept signal generator.
(2) stop scan control line: connecting the stopping scan interface of swept signal generator, after single pass,
Swept signal generator issues " stopping scanning " instruction to be terminated primary after scalar network analyzer is connected to " stopping scanning " instruction
Sweep measurement work, and send one " confirmation " instruction and arrive swept signal generator.
(3) sweep ramp control line: the sweep ramp interface of swept signal generator is connected.Swept signal generator is being swept
When frequency, the synchronous uniform ramp voltage for generating a 0V to 10V.Inside scalar network analyzer, pass through 12 DAC chips
A scanning voltage comparator is generated for core, the stepped voltage scanned every time is selected, the data scanned every time is sent to DAC,
Make DAC output voltage with certain step increments, by generating an arteries and veins under each Frequency point compared with sweep ramp voltage
Punching, the pulse synchronous signal as measurement.
(4) GPIB interface bus: by GPIB cable connection scalar network analyzer and swept signal generator, pass through mark
It measures Network Analyzer and swept signal generator is set, setting parameter includes initial frequency, terminates frequency, power level, frequency sweep point
Number, sweep time etc..
The existing scalar network analyzer scheme synchronous with swept signal generator frequency sweep, has the disadvantage that:
1) circuit is complicated, high to circuit required precision: the scanning voltage especially inside scalar network analyzer is more electric
Road, comparison voltage absolute error is no more than 0.5mV.
2) algorithm is complicated: under each Frequency point, requiring setting DAC, generates an accurate voltage and sweep ramp
Voltage is compared, and it is synchronous for frequency sweep to generate a burst pulse.In order to make up hardware absolute error, multiple calibrations, benefit are needed
It repays and verification algorithm.
Summary of the invention
For the complexity of circuit existing for existing frequency sweep synchronization scheme, the problem of algorithm complexity, the present invention provides one kind
The method of scalar network analyzer and signal generator accurate synchronization frequency sweep.
The following technical solution is employed by the present invention:
A kind of method of scalar network analyzer and signal generator accurate synchronization frequency sweep, including signal generator and scalar
Network Analyzer, signal generator pass through the first BNC cable, the 2nd BNC cable and cable and scalar network analyzer phase respectively
Even；
The method of accurate synchronization frequency sweep the following steps are included:
Step 1: sweep parameters are set on scalar network analyzer, including initial frequency, terminate frequency, sweep time and
Power level etc., parameters are sent to signal generator by cable；
Step 2: signal generator receives in step 1 after sweep parameters, starts frequency sweep, and signal generator passes through first
BNC cable send beginning/stopping scanning signal to scalar network analyzer, and signal generator will be scanned by the 2nd BNC cable
Pulse signal is sent to scalar network analyzer；
Step 3: scalar network analyzer handles beginning/stopping scanning signal that signal generator issues and scanning pulse letter
Number；
Step 4: in the case where not changing sweep parameters, step 2 and step 3 repeat.
Preferably, the signal generator includes the first beginning/stopping scan interface, the first scanning pulse interface and first
Network interface, scalar network analyzer include that the second beginning/stopping scan interface, the second scanning pulse interface and the second network connect
Mouthful；
First beginning/stopping scan interface being connected with the second beginning/stopping scan interface by the first BNC cable；
First scanning pulse interface is connected with the second scanning pulse interface by the 2nd BNC cable；
First network interface is connected with the second network interface by cable；
Scalar network analyzer further includes limited amplitude protection driving circuit, and limited amplitude protection driving circuit is electrically connected with scene and can compile
Journey gate array, field programmable gate array are electrically connected with processor.
Preferably, the step 2 specifically includes following sub-step:
Step 2.1: beginning/stopping scanning signal being drawn high, after waiting 100us, beginning/stopping scanning signal being dragged down；
Step 2.2: according to the parameter setting of scalar network analyzer, initial frequency point f is setstart；
Step 2.3: after being provided with initial frequency point, signal generator passes through the 2nd BNC cable for a scanning pulse
Signal is sent to scalar network analyzer, the synchronization signal as sweep measurement；
Step 2.4: waitingSecond Frequency point is setAfter being equally provided with, hair
A scanning pulse signal out；
Wherein, Ttotal1601 point occupied total times, f are completed for scanningendTo terminate frequency；
Step 2.5: repeating step 2.4, set gradually each frequency sweep point, until setting, which is arrived, terminates Frequency point, and will open
Beginning/stopping scanning signal being drawn high, and one time frequency sweep process terminates.
Preferably, the step 3 specifically includes following sub-step:
Step 3.1: the programmable gate array internal clock detection of 1Ms/s starts/stops scanning signal and sweeps at the scene
Retouch pulse signal；
When detecting beginning/stopping scanning signal is high level, setting frequency sweep counter is 0, in beginning/stopping scanning
Signal generates in a frequency sweep after low level, often to come a scanning pulse signal, the count value+1 of frequency sweep counter
It is disconnected；
Step 3.2: after frequency sweep interrupts arrival, notifier processes device, processor reads the value N of frequency sweep counter first, determines
Current corresponding Frequency pointThen to the signal measurement of present frequency point,In time
All measurement work are completed, and the measurement result of current frequency sweep point is shown；
After one Frequency point is measured, processor handles other work, and the arrival for waiting next frequency sweep to interrupt；
Step 3.3: after having handled the last one Frequency point, field programmable gate array detects beginning/stopping scanning
Signal is high level, by frequency sweep counter O reset, restarts sweep measurement.
The invention has the advantages that:
1) circuit is simple: all frequency sweep synchronization signals are Transistor-Transistor Logic level signal and digital signal, and there is no circuit precision
It is required that；
2) algorithm is simple: scalar network analyzer starts frequency sweep mode, scalar by network interface setting signal generator
The frequency sweep synchronization signal and scanning frequency pulse signal that Network Analyzer waiting signal generator issues, calculate according to scanning frequency pulse signal
Measurement result.
In this way, can same pacing that is simple, being accurately realized swept signal generator and scalar network analyzer
Amount.
Detailed description of the invention
Fig. 1 is existing scalar network analyzer frequency sweep schematic diagram synchronous with signal generator.
Fig. 2 is existing scalar network analyzer frequency sweep time diagram synchronous with signal generator.
Fig. 3 is scalar network analyzer of the present invention and signal generator frequency sweep synchronous circuit figure.
Fig. 4 is scan control timing diagram of the invention.
Specific embodiment
A specific embodiment of the invention is described further in the following with reference to the drawings and specific embodiments:
In conjunction with Fig. 3 and Fig. 4, a kind of method of scalar network analyzer and signal generator accurate synchronization frequency sweep, including letter
Number generator A1 and scalar network analyzer A2, signal generator pass through respectively the first BNC cable L1, the 2nd BNC cable L2 and
Cable L3 is connected with scalar network analyzer.
Signal generator includes that the first beginning/stopping scan interface K1, the first scanning pulse interface K2 and first network connect
Mouth K3, scalar network analyzer include that the second beginning/stopping scan interface K5, the second scanning pulse interface K6 and the second network connect
Mouth K4.
First beginning/stopping scan interface K1 and the second beginning/stopping scan interface K5 passes through the first BNC cable L1 phase
Even.
First scanning pulse interface K2 is connected with the second scanning pulse interface K6 by the 2nd BNC cable L2.
First network interface K3 is connected with the second network interface K4 by cable L3.
Scalar network analyzer A2 further includes limited amplitude protection driving circuit A3, and limited amplitude protection driving circuit is electrically connected with scene
Programmable gate array A4, field programmable gate array are electrically connected with processor A5.
Signal generator A1 has the function of frequency sweep, and in the initial frequency for setting frequency sweep and after terminating frequency, A1 automatically will
Initial frequency and the frequency range terminated between frequency are equally divided into 1600 parts, within the frequency sweep time of setting, since initial frequency,
According to fixed frequency interval and time interval, it is sequentially generated the signal of each Frequency point, until terminating frequency, each frequency sweep mistake
1601 Frequency points are arranged in journey altogether.
First beginning/stopping scan interface K1, when stopping scanning, beginning/stopping scanning is high level, scanned
Cheng Zhong, beginning/stopping scanning is low level.
First scanning pulse interface K2, after starting scanning, Frequency point is arranged according to Fixed Time Interval in signal generator,
After what a Frequency point is set, a scanning pulse signal is issued.
First network interface K3, in the present invention, signal generator receive scalar network analyzer hair as controlled device
Program-controlled order out.
Scalar network analyzer A2, A2 receive start stop scanning signal, the scanning pulse signal that A1 is sent, and by
Beginning/stopping scanning signal, scanning pulse signal control the power measurement in 3 channels, and according to the setting of measurement method, complete to pass
The test of the parameters such as defeated measurement, return loss and port standing-wave ratio.
The function of limited amplitude protection driving circuit A3, A3 be start stop scanning signal, scanning pulse signal protected,
The processing such as clipping, driving, it is therefore an objective to prevent outer signal from damaging scalar network analyzer internal circuit, while enhance and originating/stopping
Only scanning signal, the driving capability of scanning pulse signal, and by the start stop scanning signal after driving, scanning pulse signal
It send to field programmable gate array A4.
Field programmable gate array A4, A4 receive the start stop scanning signal after overdriving, scanning pulse signal,
Programmable gate array internal is realized and synchronous, scalar network analyzer the multi-channel data of Frequency Of Signal Generator setting at the scene
The work such as acquisition.
Processor A5, A5 carry out a power measurement after the arrival of each scanning pulse signal, and measurement result is shown in
In screen.
Second network interface K4, in the present invention, scalar network analyzer issue program-controlled order control as main control device
The setting of signal generator.
The method of accurate synchronization frequency sweep the following steps are included:
Step 1: sweep parameters are set on scalar network analyzer, including initial frequency, terminate frequency, sweep time and
Power level etc., parameters are sent to signal generator by cable.
Step 2: signal generator receives in step 1 after sweep parameters, starts frequency sweep, and signal generator passes through first
BNC cable send beginning/stopping scanning signal to scalar network analyzer, and signal generator will be scanned by the 2nd BNC cable
Pulse signal is sent to scalar network analyzer.
Specifically include following sub-step:
Step 2.1: beginning/stopping scanning signal being drawn high, after waiting 100us, beginning/stopping scanning signal being dragged down；
Step 2.2: according to the parameter setting of scalar network analyzer, initial frequency point f is setstart；
Step 2.3: after being provided with initial frequency point, signal generator passes through the 2nd BNC cable for a scanning pulse
Signal is sent to scalar network analyzer, the synchronization signal as sweep measurement；
Step 2.4: waitingSecond Frequency point is setAfter being equally provided with, hair
A scanning pulse signal out；
Wherein, Ttotal1601 point occupied total times, f are completed for scanningendTo terminate frequency；
Step 2.5: repeating step 2.4, set gradually each frequency sweep point, until setting, which is arrived, terminates Frequency point, and will open
Beginning/stopping scanning signal being drawn high, and one time frequency sweep process terminates.
Step 3: scalar network analyzer handles beginning/stopping scanning signal that signal generator issues and scanning pulse letter
Number.
Specifically include following sub-step:
Step 3.1: the programmable gate array internal clock detection of 1Ms/s starts/stops scanning signal and sweeps at the scene
Retouch pulse signal；
When detecting beginning/stopping scanning signal is high level, setting frequency sweep counter is 0, in beginning/stopping scanning
Signal generates in a frequency sweep after low level, often to come a scanning pulse signal, the count value+1 of frequency sweep counter
It is disconnected；
Step 3.2: after frequency sweep interrupts arrival, notifier processes device, processor reads the value N of frequency sweep counter first, determines
Current corresponding Frequency pointThen to the signal measurement of present frequency point,In time
All measurement work are completed, and the measurement result of current frequency sweep point is shown；
After one Frequency point is measured, processor handles other work, and the arrival for waiting next frequency sweep to interrupt；
Step 3.3: after having handled the last one Frequency point, field programmable gate array detects beginning/stopping scanning
Signal is high level, by frequency sweep counter O reset, restarts sweep measurement.
Step 4: after scalar network analyzer completes primary setting to signal generator, being set if not changing parameter
It sets, then above-mentioned frequency sweep process continues, and the measurement result of mistake will not occur.
Certainly, the above description is not a limitation of the present invention, and the present invention is also not limited to the example above, this technology neck
The variations, modifications, additions or substitutions that the technical staff in domain is made within the essential scope of the present invention also should belong to of the invention
Protection scope.
Claims (4)
1. a kind of method of scalar network analyzer and signal generator accurate synchronization frequency sweep, which is characterized in that sent out including signal
Raw device and scalar network analyzer, signal generator pass through the first BNC cable, the 2nd BNC cable and cable and scalar net respectively
Network analyzer is connected；
The method of accurate synchronization frequency sweep the following steps are included:
Step 1: sweep parameters, including initial frequency, termination frequency, sweep time and power are set on scalar network analyzer
Level, parameters are sent to signal generator by cable；
Step 2: signal generator receives in step 1 after sweep parameters, starts frequency sweep, and signal generator passes through the first BNC electricity
Cable send beginning/stopping scanning signal to scalar network analyzer, and signal generator is believed scanning pulse by the 2nd BNC cable
It number send to scalar network analyzer；
Step 3: scalar network analyzer handles the beginning/stopping scanning signal and scanning pulse signal that signal generator issues；
Step 4: in the case where not changing sweep parameters, step 2 and step 3 repeat.
2. the method for a kind of scalar network analyzer according to claim 1 and signal generator accurate synchronization frequency sweep,
It is characterized in that, the signal generator includes that the first beginning/stopping scan interface, the first scanning pulse interface and first network connect
Mouthful, scalar network analyzer includes the second beginning/stopping scan interface, the second scanning pulse interface and the second network interface；
First beginning/stopping scan interface being connected with the second beginning/stopping scan interface by the first BNC cable；
First scanning pulse interface is connected with the second scanning pulse interface by the 2nd BNC cable；
First network interface is connected with the second network interface by cable；
Scalar network analyzer further includes limited amplitude protection driving circuit, and limited amplitude protection driving circuit is electrically connected with field programmable gate
Array, field programmable gate array are electrically connected with processor.
3. the method for a kind of scalar network analyzer according to claim 2 and signal generator accurate synchronization frequency sweep,
It is characterized in that, the step 2 specifically includes following sub-step:
Step 2.1: beginning/stopping scanning signal being drawn high, after waiting 100us, beginning/stopping scanning signal being dragged down；
Step 2.2: according to the parameter setting of scalar network analyzer, initial frequency point f is setstart；
Step 2.3: after being provided with initial frequency point, signal generator passes through the 2nd BNC cable for a scanning pulse signal
It send to scalar network analyzer, the synchronization signal as sweep measurement；
Step 2.4: waitingSecond Frequency point is setAfter being equally provided with, one is issued
A scanning pulse signal；
Wherein, Ttotal1601 point occupied total times, f are completed for scanningendTo terminate frequency；
Step 2.5: repeating step 2.4, set gradually each frequency sweep point, until setting, which is arrived, terminates Frequency point, and will start/stop
Only scanning signal is drawn high, and one time frequency sweep process terminates.
4. the method for a kind of scalar network analyzer according to claim 3 and signal generator accurate synchronization frequency sweep,
It is characterized in that, the step 3 specifically includes following sub-step:
Step 3.1: the programmable gate array internal clock detection of 1Ms/s starts/stops scanning signal and scanning arteries and veins at the scene
Rush signal；
When detecting beginning/stopping scanning signal is high level, setting frequency sweep counter is 0, in beginning/stopping scanning signal
After low level, often come a scanning pulse signal, the count value+1 of frequency sweep counter, while generating a frequency sweep and interrupting；
Step 3.2: after frequency sweep interrupts arrival, notifier processes device, processor reads the value N of frequency sweep counter first, determines current
Corresponding Frequency pointThen to the signal measurement of present frequency point,It is completed in time
All measurement work, and the measurement result of current frequency sweep point is shown；
After one Frequency point is measured, processor handles other work, and the arrival for waiting next frequency sweep to interrupt；
Step 3.3: after having handled the last one Frequency point, field programmable gate array detects beginning/stopping scanning signal
Frequency sweep counter O reset is restarted into sweep measurement for high level.
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Cited By (1)
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Application publication date: 20181218 |