CN110568259A - Remote amplitude-frequency characteristic measuring device - Google Patents
Remote amplitude-frequency characteristic measuring device Download PDFInfo
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- CN110568259A CN110568259A CN201910793166.6A CN201910793166A CN110568259A CN 110568259 A CN110568259 A CN 110568259A CN 201910793166 A CN201910793166 A CN 201910793166A CN 110568259 A CN110568259 A CN 110568259A
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R23/00—Arrangements for measuring frequencies; Arrangements for analysing frequency spectra
- G01R23/16—Spectrum analysis; Fourier analysis
Abstract
The invention provides a remote amplitude-frequency characteristic measuring device, which comprises a signal source module, a fixed gain amplification module, a voltage-controlled gain amplification module, a power divider, a first power detection module, a high-speed ADC module, a second power detection module, a main control module, a WIFI module, a router, a PC and a display screen, wherein the signal source module is connected with the fixed gain amplification module, the fixed gain amplification module is connected with the voltage-controlled gain amplification module, the voltage-controlled gain amplification module is connected with the power amplification module, the power amplification module is respectively connected with the power divider and the second power detection module, the power divider is connected with the first power detection module and the high-speed ADC module, the first power detection module, the second power detection module, the high-speed ADC module, the voltage-controlled gain amplification module, the WIFI module and the display screen are respectively connected with the main control module, the PC is connected with the router, the router is connected with the WIFI module. The invention has the advantages of small volume, high precision, low price, simple operation, easy maintenance and the like.
Description
Technical Field
The invention relates to the technical field of amplitude-frequency characteristic testing, in particular to a remote amplitude-frequency characteristic measuring device.
Background
The amplitude-frequency characteristic is a rule that the signal amplitude changes along with different frequencies, and the measurement of unknown network transmission characteristics, such as flatness and cut-off frequency of a filter, bandwidth test of an amplifier, noise detection of a circuit and the like, is often used in the modern electronic measurement technology, so that the information of the amplitude-frequency characteristic in engineering has important significance.
The existing methods for measuring the amplitude-frequency characteristics mainly comprise a point-by-point analysis method and a frequency sweep method. Point-by-point analysis: the input end inputs the constant amplitude signals with different frequencies, the output end measures the output signals one by one, and an amplitude-frequency characteristic curve is drawn according to the output signals. Frequency sweep method: a sweep generator is utilized to generate constant amplitude signals with continuous frequency, and an amplitude-frequency characteristic curve is drawn on a screen through an amplifying device. The frequency-sweep method is a common method for measuring the amplitude-frequency characteristic at present.
at present, a sweep generator is mainly used for measuring the amplitude-frequency characteristic, the traditional sweep generator in China has large volume and lower precision and cannot be automatically tested on site, the sweep generator in foreign countries mainly has high frequency, and the problems of high price, complex operation, difficult maintenance and the like exist although the performance is stable.
Disclosure of Invention
The invention provides a remote amplitude-frequency characteristic testing device aiming at the defects of the prior art.
the technical scheme of the remote amplitude-frequency characteristic testing device comprises the following steps: the device comprises a signal source module, a fixed gain amplification module, a voltage-controlled gain amplification module, a power divider, a first power detection module, a high-speed ADC module, a second power detection module, a main control module, a WIFI module, a router, a PC and a display screen; the signal output end of the signal source module is connected with the signal input end of the fixed gain amplification module, and the signal source module is used for generating a sine frequency sweeping signal; the signal output end of the fixed gain amplification module and the main control module are respectively connected with the signal input end of the voltage-controlled gain amplification module, the signal output end of the voltage-controlled gain amplification module is connected with the signal input end of the power amplification module, and the fixed gain amplification module, the voltage-controlled gain amplification module and the power amplification module are used for amplifying the gain of the sine frequency sweeping signal generated by the signal source module and outputting the sine frequency sweeping signal with continuously adjustable amplitude and high flatness; a part of a signal output end of the power amplification module is connected with a signal input end of a first power detection module, a signal output end of the first power detection module is connected with a main control module, the voltage-controlled gain amplification module, the power amplification module and the first power detection module form a closed-loop system, the amplitude of a signal is stably output to be 1V by adjusting the gain of the closed-loop system, and the first power detection module is used for detecting whether the amplitude of a sinusoidal sweep frequency signal output by the power amplification module reaches 1V or not; the other part of the signal output end of the power amplification module is respectively connected with the signal input end of the second power detection module and the signal input end of the high-speed ADC module through the power divider, the signal output end of the first power detection module, the signal output end of the second power detection module and the signal output end of the high-speed ADC module are respectively connected with the main control module, and the second power detection module is used for acquiring the amplitude of the sine frequency sweep signal output by the power amplification module and acquiring the amplitude information of the sine frequency sweep signal through the internal ADC of the main control module; the high-speed ADC module is used for acquiring frequency information of the sine frequency sweeping signal output by the power amplification module, the master control module performs FFT (fast Fourier transform) to acquire the frequency information of the sine frequency sweeping signal, and the master control module draws an amplitude-frequency characteristic curve according to the amplitude information and the frequency information of the acquired sine frequency sweeping signal; the display screen is connected with the main control module and is used for displaying the amplitude-frequency characteristic curve drawn by the main control module; the WIFI module is respectively connected with the master control module and the router, the router is connected with the PC, and amplitude information and frequency information of the sine frequency sweeping signals acquired by the master control module are transmitted to the PC through the WIFI module and the router.
In addition, preferably, the signal source module adopts a direct frequency synthesis chip AD 9850.
preferably, the fixed gain amplification module includes two cascaded OPA695 chips and peripheral circuits thereof.
Preferably, the voltage-controlled gain amplification module is composed of two cascaded VCA821 chips and DAC7612_ D _8 chips.
In addition, the preferred scheme is that the main control module adopts an STM32F429 singlechip.
In addition, preferably, the power amplification module adopts a current feedback type operational amplifier THS3091 chip.
Preferably, the first power detection module and the second power detection module each employ an AD8317 chip.
In addition, the high-speed ADC module preferably adopts an LTC2153-12 chip.
In addition, the WIFI module preferably adopts an ESP8266 chip.
Compared with the prior art, the remote amplitude-frequency characteristic measuring device provided by the invention can achieve the following technical effects:
1. output frequency range of signal source module: 1MHz-40 MHz; step by step: 1MHz and has an automatic scanning function; when the load resistance is 50, the peak-to-peak value of the output voltage can be adjusted between 5mV and 100 mV.
2. The fixed gain amplification module, the voltage-controlled gain amplification module and the power amplification module can realize input impedance: 50; bandwidth: 1MHz-40 MHz; gain: 40dB, continuously adjustable in 0-40 dB; when the load resistance is 50, the peak-to-peak value of the output voltage is 1V, and the waveform has no obvious distortion.
3. The amplified sine frequency sweeping signal is connected with the main control module by a twisted pair (one is a signal transmission line and the other is a ground wire) with the length of 1.5m, the amplitude-frequency characteristic test of the sine frequency sweeping signal can be finished by a PC (personal computer) connected with the main control module, and the amplitude-frequency characteristic of the sine frequency sweeping signal can be displayed on a display screen.
4. A local area network is independently built by using a WIFI module and a router, frequency information of the sine frequency sweeping signals can be transmitted to a PC, the PC is used for completing amplitude-frequency characteristic test of the sine frequency sweeping signals, and the amplitude-frequency characteristic of the sine frequency sweeping signals is displayed in a curve mode.
to the accomplishment of the foregoing and related ends, one or more aspects of the invention comprise the features hereinafter fully described. The following description and the annexed drawings set forth in detail certain illustrative aspects of the invention. These aspects are indicative, however, of but a few of the various ways in which the principles of the invention may be employed. Further, the present invention is intended to include all such aspects and their equivalents.
Drawings
Other objects and results of the present invention will become more apparent and more readily appreciated as the same becomes better understood by reference to the following description taken in conjunction with the accompanying drawings. In the drawings:
fig. 1 is a logical block diagram of a remote amplitude-frequency characteristic measurement apparatus according to an embodiment of the present invention;
FIG. 2 is a circuit diagram of a signal source module according to an embodiment of the invention;
FIG. 3 is a circuit diagram of a fixed gain amplification module according to an embodiment of the present invention;
FIG. 4 is a circuit diagram of a voltage controlled gain amplifier module according to an embodiment of the present invention;
Fig. 5 is a circuit diagram of a power amplifying module according to an embodiment of the present invention;
FIG. 6 is a circuit diagram of a high speed ADC module according to an embodiment of the present invention;
FIG. 7 is a circuit diagram of a first power detection module according to an embodiment of the invention.
Wherein the reference numerals include: the signal source module 1, the fixed gain amplification module 2, the voltage-controlled gain amplification module 3, the power amplification module 4, the power divider 5, the first power detection module 6, the high-speed ADC module 7, the second power detection module 8, the main control module 9, the WIFI module 10, the router 11, the PC 12 and the display screen 13.
Detailed Description
In order to better explain the technical scheme of the invention, the following detailed description of the specific embodiments of the invention is provided in conjunction with the accompanying drawings.
Fig. 1 shows a logical structure of a remote amplitude-frequency characteristic measurement apparatus according to an embodiment of the present invention.
as shown in FIG. 1, the device for measuring the remote amplitude ~ frequency characteristic comprises a signal source module 1, a fixed gain amplification module 2, a voltage ~ controlled gain amplification module 3, a power amplification module 4, a power divider 5, a first power detection module 6, a high ~ speed ADC module 7, a second power detection module 8, a main control module 9, a WIFI module 10, a router 11, a PC 12 and a display screen 13, wherein the signal output end of the signal source module 1 is connected with the signal input end of the fixed gain amplification module 2, the signal source module 1 is used for generating a stepping sine sweep frequency signal, the automatic sweep frequency signal stepping into a 1MHz signal within a frequency range of 1 ~ 40MHz is completed, the sine signal generated by the signal source module 1 is connected to the fixed gain amplification module 2, the signal output end of the fixed gain amplification module 2 and the main control module 9 are respectively connected with the signal input end of the voltage ~ controlled gain amplification module 3, the signal output end of the voltage ~ controlled gain amplification module 3 is connected with the signal input end of the power amplification module 4, the voltage ~ controlled gain amplification module 3 and the signal output end of the power amplification module 4 is connected with the main control module 4, the master control module 9, the sweep frequency amplification module 4 is used for obtaining the sweep frequency power of the sweep frequency signal, the sweep frequency power, the sweep frequency amplification power of the sweep frequency signal, the sweep frequency amplification power amplification module 6 is used for obtaining the sweep frequency signal, the sweep frequency amplification power of the sweep frequency amplification module 6, the sweep frequency amplification module 6 is used for obtaining the sweep frequency power of the sweep frequency amplification module 6, the sweep frequency amplification module 6 is used for obtaining the sweep frequency signal, the sweep frequency power of the sweep frequency signal, the sweep frequency amplification module 4 is used for obtaining the sweep frequency signal, the sweep frequency power of the sweep frequency signal, the sweep frequency power of the sweep frequency signal, the sweep frequency power of.
Fig. 2 shows a circuit of a signal source module according to an embodiment of the invention.
As shown in fig. 2, the signal source module 1 uses a direct frequency synthesis chip AD9850 with high integration to self-make a signal source, and the signal source module 1 is composed of an AD9850 chip and a peripheral circuit; pins 5, 10, 19 and 24 of the AD9850 chip are connected with GND, and pins 6, 11, 18 and 23 of the AD9850 chip are connected with VCC; the 12 pin series resistor R6 of the AD9850 chip is connected with GND, the 9 pin of the AD9850 chip is connected with CLKIN, the CLKIN is generated by adopting a 125MHz crystal oscillator, the 4 pin of the crystal oscillator is connected with VCC, the pin of the crystal oscillator 2 is connected with GND, and the 1 pin of the crystal oscillator is suspended; the 21 pin of the AD9850 chip is connected with IOUT, the IOUT and Z _ OUT indirect resistors R4 and R5, inductors L1, L2 and L3, capacitors C1, C2, C3, C4, C5, C6 and C7 form a loop filter; j2 and J4 are pin header outgoing lines and pin headers, and other pin headers are clearly marked in other pin diagrams and can be understood by those skilled in the art, and are not described herein; the AD9850 chip VCC is connected with GND in parallel through capacitors C8, C9, C10, C11, C12 and C13.
Fig. 3 shows a circuit of a fixed gain amplification block according to an embodiment of the invention.
As shown in fig. 3, the fixed gain amplification module 2 is formed by two cascaded OPA695 chips and peripheral circuits, preferably, a +5V single power supply is used, the resistors R2 and R6 form a first-stage voltage division bias, the resistors R3 and R7 form a second-stage voltage division bias, and the 2 pin of the first OPA695 chip is connected in series with the resistor R11 and then connected in parallel with the capacitors C13 and C14 to GND; the 2 pin of the first OPA695 chip is connected with a resistor R8 in series and then is connected with a6 pin; a 3-pin series capacitor C9 of the first OPA695 chip is connected with the SMA deflection angle head P2; the SMA declination head P2 is a signal input port; diodes GBLC1 and R6 are connected between the 3 pin of the first OPA695 chip and GND in parallel; a resistor R2 is connected in series between the 3 pin of the first OPA695 chip and the +5V power supply; the 6-pin series capacitor C11 and the resistor R5 of the first OPA695 chip are connected with the 3-pin of the second OPA695 chip; the 4 pins of the first OPA695 chip are connected with GND, and the rest pins are vacant; after a 2-pin of the second OPA695 chip is connected with a resistor R12 in series, capacitors C15 and C16 are connected with GND in parallel; the 2 pin of the second OPA695 chip is connected with a resistor R10 in series and then is connected with a6 pin; a series resistor R3 between the 3 pin of the second OPA695 chip and the +5V power supply and a series resistor R7 between the second OPA695 chip and GND; the 4 pins of the second OPA695 chip are connected with GND, and the rest pins are vacant; capacitors C1, C2, C3 and C4 are connected in parallel between the +5V power supply and GND, and power supply ripples are filtered; a 6-pin of the second OPA695 chip is connected in series with a capacitor C10 and a resistor R4 and then is connected with an SMA deflection angle head P3; the SMA declination head P3 is a signal output port.
Fig. 4 shows a circuit of a voltage controlled gain amplification module according to an embodiment of the invention.
As shown in FIG. 4, the voltage-controlled gain amplification module 3 comprises two cascaded VCA821 chips and DAC7612_ D _8 chips, a first VCA821 chip with pins 1 connected with pins 14 and then connected with a +5V power supply, a DAC7612_ D _8 chip for outputting two paths of DAC which respectively generate 0 ~ V stable direct current voltage for controlling the gain of the two VCA amplifiers, DAC7612_ D _8 chips with pins 1, 2, 3, 4 connected with SDL, CLK, LOADDA, CS connected with the IO port of a single chip as a serial data interface, a first VCA821 chip with pins 2_ D _8 chip 8 connected with pins 2, a first VCA chip with pins 3 connected with a series capacitor C31 and then connected with an SMA deviation angle head P5, a first VCA821 chip with pins 4 connected with a series resistor R39821 and then connected with pins 5, a first VCA821 chip with pins 6 and 11, a first VCA chip with pins 7 and a power supply pin 5V 821 connected with pins 3, a power supply pin 3-9 and a power supply pin 3V 821 connected with pins 2C 9 and a chip, a chip with pins 2R 6 and a chip 23C 9C 2D _8 chip, a chip connected with pins 3C 2D _8 chip, a chip connected with pins 3C 2.
fig. 5 shows a circuit of a power amplifying module according to an embodiment of the present invention.
As shown in fig. 5, the power amplification module 4 adopts a current feedback type operational amplifier THS3091 chip, which is mainly used for improving load driving capability, and the circuit bandwidth is less affected by gain, so that the bandwidth requirement can be met while amplification is performed. A 2-pin series resistor R30 of the THS3091 chip is connected with a 6-pin, and a 2-pin series resistor R29 of the THS3091 chip is connected with GND; the 3 pins of the THS3091 chip are connected with an SMA deflection angle head P8, and the SMA deflection angle head P8 is a signal input end; a resistor R31 is connected between the 3 pin of the THS3091 chip and GND in series; the 4 pins of the THS3091 chip are connected with a-15 power supply; 15 parallel connection between power supply and GND C48, C49; the 5 pin of the THS3091 chip is grounded; a6 pin series resistor R32 of the THS3091 chip is connected with an SMA deflection angle head P9; the SMA declination head P9 is a signal output end; a 7 pin of the THS3091 chip is connected with a +15V power supply; capacitors C46 and C47 are connected between the +15V power supply and GND in parallel; the rest pins are empty.
Fig. 6 shows a circuit of a high-speed ADC module according to an embodiment of the invention.
As shown in fig. 6, the high-speed ADC module 7 adopts LTC2153-12 chips, a single power supply of 1.8V supplies power, capacitors C17 and C18 are connected in parallel between the power supply of 1.8V and GND, and the power supply is filtered; an inductor L1 is connected in series between the power supply 1.8V and VDD; an inductor L2 is connected in series between the power supply 1.8V and the OVDD; capacitors C19, C20 and C21 are connected between the OVDD and the GND in parallel; a 1 pin of the LTC2153-12 chip is connected with a 7 pin after being connected with a resistor R15 in series; 1, connecting a pin with a pin 2; 1 pin is connected with VDD; capacitors C27 and C28 are connected between VDD and GND in parallel; pins 3, 6, 10, 11, 13, 21 and 35 of the LTC2153-12 chip are all connected with GND; the LTC2153-12 chip adopts single-ended analog input, is input through an SMA deflection angle head P7, is coupled through a transformer T1 through a C43, the turn ratio of the transformer is 1:1, the other end of the primary side of the T1 is connected with GND, the secondary side of the T1 is matched with resistors R16, R18, R17 and R28, and a capacitor C44 is connected with pins 4 and 5 of the LTC2153-12 chip; a pin 9 of the LTC2153-12 chip, a capacitor C35 and a C45 resistor R25 form a T-shaped network to be connected between the resistors R17 and R28; a capacitor C34 is connected between the 8 pin of the LTC2153-12 chip and GND in series; 11 pins of the LTC2153-12 chip are connected with C41, R27 and C42 in series and then connected with 12 pins; a capacitor C40 is connected between the 20 pin of the LTC2153-12 chip and GND in series; and a capacitor C22 is connected between the 20 pin of the LTC2153-12 chip and GND in series.
The circuit of the first power detection module 6 is the same as that of the second power detection module 8, and the circuit of the first power detection module 6 is shown in the present invention, and the circuit of the second power detection module 8 is similarly obtained.
FIG. 7 shows a circuit of a first power detection module according to an embodiment of the invention.
As shown in fig. 7, the first power detection module 6 employs an AD8317 chip with high precision and wide bandwidth, an SMA angular head P1 is a detection input port, and a capacitor C5 is connected in series between the SMA angular head P1 and the 1 pin of the AD8317 chip; a resistor R1 is connected between the SMA deflection angle head P1 and GND in series; the 2 pin of the AD8317 chip is connected with GND; a capacitor C12 is connected between the 3 pin of the AD8317 chip and GND in series, and the 4 pin of the AD8317 chip is connected with the 5 pin after being connected with a resistor R14 in series; the rear part of the 5-pin series resistor R13 is connected with an SMA deflection angle head P4, and the SMA deflection angle head P4 is a detection output port; the 6 pin series resistor R9 of the AD8317 chip is connected with GND after connection; the 7 pin of the AD8317 chip is connected with a +5V power supply, and capacitors C7 and C8 are connected between the +5V power supply and GND in parallel; and a capacitor C6 is connected between the 8 pin and the GND in series.
The main control module 9 adopts an STM32F429 high-performance single chip microcomputer to complete task control and a data processing core, and the WIFI module 10 adopts an ESP8266 chip.
Practical measurement example
As shown in Table 1, for the test part data and analysis of the embodiment, 1 signal source and controllable gain amplifier test, the DS1104 type oscilloscope is adopted in the invention, after the power amplification module, the frequency of the signal generator is set to be 1 ~ 40MHz, the actual frequency and voltage effective value are measured when the output effective value is 1V, the distortion condition is observed, and the precision is calculated, and the circuit test data is shown in Table 1.
TABLE 1 Circuit test data
As can be seen from the test data in Table 1, the invention sets the amplitude of the output voltage to be 1V, the actual voltage value precision measured by the frequency change of 1 ~ 40MHz is about 2%, the signal has no obvious distortion, and the frequency is relatively stable.
Pass band testing
the output signal of the signal source amplifier is connected with the amplitude ~ frequency characteristic testing device by utilizing a twisted pair (one is a signal transmission line and the other is a ground wire) with the length of 1.5m, the amplitude ~ frequency characteristic testing of the output signal of the amplifier can be completed by the amplitude ~ frequency characteristic testing device, the amplitude of the output voltage is set to be 1V, and the amplitude ~ frequency characteristic data of the output signal is measured by the change of the frequency of 0.5 ~ 41 MHz.
The passband test data is shown in table 2:
TABLE 2 passband test data
As can be seen from the test data in Table 2, the amplitude ~ frequency characteristic data of the invention is obtained by setting the amplitude of the output voltage to be 1V and the frequency to be 0.5 ~ 41MHz, the amplitude of the output voltage is 0.76 ~ 0.86V, the attenuation of the twisted pair signal is serious, the frequency is calculated by fft after A/D, and the error precision is within 0.15% within the range of 1 ~ 40 MHz.
The above description is only for the specific embodiments of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art can easily conceive of the changes or substitutions within the technical scope of the present invention, and the changes or substitutions should be covered within the scope of the present invention. Therefore, the protection scope of the present invention shall be subject to the protection scope of the claims.
Claims (9)
1. A remote amplitude-frequency characteristic measuring apparatus, comprising: the device comprises a signal source module, a fixed gain amplification module, a voltage-controlled gain amplification module, a power divider, a first power detection module, a high-speed ADC module, a second power detection module, a main control module, a WIFI module, a router, a PC and a display screen; wherein the content of the first and second substances,
the signal output end of the signal source module is connected with the signal input end of the fixed gain amplification module, and the signal source module is used for generating a sine frequency sweeping signal; the signal output end of the fixed gain amplification module and the main control module are respectively connected with the signal input end of the voltage-controlled gain amplification module, the signal output end of the voltage-controlled gain amplification module is connected with the signal input end of the power amplification module, and the fixed gain amplification module, the voltage-controlled gain amplification module and the power amplification module are used for amplifying the gain of the sine frequency sweep signal generated by the signal source module and outputting the sine frequency sweep signal with continuously adjustable amplitude and high flatness; a part of a signal output end of the power amplification module is connected with a signal input end of the first power detection module, a signal output end of the first power detection module is connected with the main control module, the voltage-controlled gain amplification module, the power amplification module and the first power detection module form a closed-loop system, the amplitude of a signal is stably output to be 1V by adjusting the gain of the closed-loop system, and the first power detection module is used for detecting whether the amplitude of a sinusoidal sweep frequency signal output by the power amplification module reaches 1V or not; the other part of the signal output end of the power amplification module is respectively connected with the signal input end of the second power detection module and the signal input end of the high-speed ADC module through the power divider, the signal output end of the first power detection module, the signal output end of the second power detection module and the signal output end of the high-speed ADC module are respectively connected with the main control module, and the second power detection module is used for acquiring the amplitude of the sine frequency sweep signal output by the power amplification module and acquiring the amplitude information of the sine frequency sweep signal through the internal ADC of the main control module; the high-speed ADC module is used for acquiring frequency information of the sine frequency sweeping signal output by the power amplification module, the main control module performs FFT (fast Fourier transform) to acquire the frequency information of the sine frequency sweeping signal, and the main control module draws an amplitude-frequency characteristic curve according to the amplitude information and the frequency information of the acquired sine frequency sweeping signal;
The display screen is connected with the main control module and is used for displaying the amplitude-frequency characteristic curve drawn by the main control module;
The WIFI module is respectively connected with the main control module and the router, the router is connected with the PC, and amplitude information and frequency information of the sine frequency sweeping signals acquired by the main control module are transmitted to the PC through the WIFI module and the router.
2. the remote amplitude-frequency characteristic measuring device of claim 1, wherein the signal source module adopts a direct frequency synthesis chip AD 9850.
3. the remote amplitude-frequency characteristic measuring device as claimed in claim 1, wherein the fixed gain amplifying module is composed of two cascaded OPA695 chips and peripheral circuits thereof.
4. the remote amplitude-frequency characteristic measuring device as claimed in claim 1, wherein the voltage-controlled gain amplifying module is composed of two cascaded VCA821 chips and DAC7612_ D _8 chips.
5. The remote amplitude-frequency characteristic measuring device of claim 1, wherein the main control module adopts an STM32F429 singlechip.
6. The remote amplitude-frequency characteristic measuring device according to claim 1, wherein the power amplification module employs a current feedback type operational amplifier THS3091 chip.
7. The apparatus as claimed in claim 1, wherein the first power detection module and the second power detection module respectively employ AD8317 chips.
8. The remote amplitude-frequency characteristic measuring device according to claim 1, wherein the high-speed ADC module employs an LTC2153-12 chip.
9. The remote amplitude-frequency characteristic measurement device according to claim 1, wherein the WIFI module employs an ESP8266 chip.
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Cited By (1)
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| CN111030606A (en) * | 2019-12-24 | 2020-04-17 | 天津工业大学 | Fault detection circuit and method of amplifying circuit |
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Application publication date: 20191213 |