CN214375934U - Wide-range signal generator device - Google Patents

Abstract

The application discloses a wide-range signal generator device, relating to the time frequency measurement field and aiming at generating a frequency signal satisfying the verification of time frequency measurement equipment, such as a universal counter, the device comprises an interface circuit, a DDS low-frequency module, a PLL high-frequency module, a clock module, a liquid crystal display module, an FPGA and a microprocessor, wherein the clock module is connected to an I/O port of the FPGA, the DDS low-frequency module and the PLL high-frequency module are respectively connected with the FPGA, the FPGA is connected with the microprocessor, the microprocessor is also connected with the liquid crystal display module, and through the optimization of the interface circuit, very low amplitude frequency signals can be output, using the DDS and PLL methods, at frequencies as low as 10uHz, as high as 30GHz, the frequency and amplitude of the output signal can be controlled in a program mode through a network or a serial port, the efficiency of measuring the universal counter is improved, and the test cost is reduced.

Description

Wide-range signal generator device

Technical Field

The application relates to the field of instantaneous day-to-day difference measurement, in particular to a wide-range signal generator device.

Background

At present, all instruments generating test signals are collectively called signal sources. Also referred to as signal generators, for generating electrical test signals of a particular parameter required by the circuit under test. When testing, researching or adjusting electronic circuits and equipment, it is required to provide electric signals meeting the determined technical conditions for measuring some electric parameters of the circuits, such as measuring frequency response, noise coefficient, and defining degree for a voltmeter, so as to simulate the excitation signals of the equipment to be tested used in actual work. When the steady-state characteristic measurement of the system is required, a sinusoidal signal source with known amplitude and frequency is used. When testing the transient characteristics of the system, a rectangular pulse source with known lead time, pulse width and repetition period is used. And the parameters of the signal output by the signal source, such as frequency, waveform, output voltage or power, can be accurately adjusted within a certain range, and the signal source has good stability and output indication. The signal sources can be divided into four categories, namely sine wave signal generators, rectangular pulse signal generators, function signal generators, random signal generators and the like according to different output waveforms. Sinusoidal signals are the most widely used test signals. This is because the method of generating the sinusoidal signal is relatively simple and the measurement with the sinusoidal signal is relatively convenient. The sinusoidal signal source can be divided into several kinds according to different working frequency ranges.

Referring to fig. 3, in the measurement of the universal counter, there is a sensitivity test, and it is necessary to connect the output signal of the signal generator to the measurement terminal of the universal counter and the power meter.

Referring to the following table, the frequency of the signal generator is adjusted to each frequency point listed in the following table, the output level of each point is gradually increased from 10mV until the detected general counter works normally and the reading is stable and accurate, and the output level of the synthesized signal generator is the input sensitivity of the verification point; when the output level is measured by a power meter, the display value is used as the input sensitivity of the detected point.

Current signal generator, generally can satisfy the low frequency, and the high frequency just can not satisfy, or the power can not be stable, needs to measure actual power through the power meter.

If the signal generator which can output a proper range and has accurate power setting is used for generating a source, the test can be carried out quickly, the calibration can be carried out quickly, the efficiency is greatly improved, and the cost is reduced. There is therefore a need for a device for testing a universal counter by means of one piece of equipment.

Disclosure of Invention

The application discloses wide range signal generator device, aim at through interface circuit's optimization, the frequency signal of exportable extremely low amplitude, use DDS and PLL method, output frequency can reach 10uHz low, and the height can reach 30GHz, can programme-controlled output signal's frequency and range through network or serial ports, improves the efficiency of measuring general counter, has reduced test cost.

In order to solve the above problems, the following technical solutions are adopted in the present application: a wide-range signal generator device comprises an interface circuit, a DDS low-frequency module, a PLL high-frequency module, a clock module, a liquid crystal display module, an FPGA and a microprocessor; the interface circuit is connected with the DDS low-frequency module, the interface circuit module is connected with the PLL high-frequency module, the DDS low-frequency module and the PLL high-frequency module are connected to an I/O port of the FPGA in a frequency division mode, the clock module is connected to a clock signal input end of the FPGA, the FPGA is connected with a microprocessor used for processing information, and the microprocessor is further connected with the liquid crystal display module.

Preferably, the FPGA and the microprocessor are connected by an SPI bus, and the liquid crystal display module and the microprocessor are connected by an SPI bus.

Preferably, the microprocessor employs an ARM processor.

Preferably, the model selected by the ARM processor is STM32F407VET 6.

Preferably, the clock module adopts a 3627 packaged high-precision constant-temperature crystal oscillator.

Preferably, the liquid crystal display module comprises a 7-inch liquid crystal display screen and a key.

Preferably, the model of the FPGA is chosen to be EP4CE6E22C 8.

Compared with the prior art, the beneficial effects of this application are as follows:

according to the DDS and PLL method, the interface circuit is optimized, frequency signals with extremely low amplitude can be output, the DDS and PLL method is used, the output frequency can be 10uHz, the output frequency can be 30GHz, the frequency and the amplitude of the output signals can be controlled in a program mode through a network or a serial port, liquid crystal can also be directly operated, convenience and convenience are achieved, the efficiency of measuring a general counter is improved, and the test cost is reduced.

Drawings

Fig. 1 is a schematic overall structure diagram of the present application.

Fig. 2 is a diagram of a user operating system in the present application.

Fig. 3 is a drawing of the background art of the present application.

Reference numerals: 1. an interface circuit; 2. a DDS low frequency module; 3. a PLL high frequency module; 4. An FPGA; 5. a clock module; 6. a microprocessor; 7. a network control module; 8. a liquid crystal display module.

Detailed Description

The technical solutions in the embodiments of the present application will be clearly and completely described below with reference to the drawings in the embodiments of the present application, and it is obvious that the described embodiments are only a part of the embodiments of the present application, and not all of the embodiments. All other embodiments, which can be derived by a person skilled in the art from the embodiments given herein without making any creative effort, shall fall within the protection scope of the present application.

The application discloses a wide-range signal generator device, the structure of which is shown in fig. 1, and the wide-range signal generator device comprises an interface circuit 1, a DDS low-frequency module 2, a PLL high-frequency module 3, a clock module 5, a liquid crystal display module 8, an FPGA4 and a microprocessor 6. The clock module 5 is connected to an I/O port of the FPGA4, the DDS low-frequency module 2 and the PLL high-frequency module 3 are respectively connected with the FPGA4, the FPGA4 is connected with the microprocessor 6, and the microprocessor 6 is also connected with the liquid crystal display module 8.

In the embodiment, the microprocessor 6 preferably adopts an ARM processor, and the model selected by the ARM processor is STM32F407VET 6; the clock module 5 adopts a 3627 packaged high-precision constant-temperature crystal oscillator, has high short-term stability, small volume and low power consumption, and can realize the output of high-precision low-jitter frequency signals to the DDS low-frequency module 2 and the PLL high-frequency module 3 by matching with the FPGA 4; the liquid crystal display module 8 comprises a 7-inch liquid crystal display screen and a coder knob key, and a user can directly operate through liquid crystal and also can operate and control through the key; the model number of the FPGA4 is selected as EP4CE6E22C 8.

The working process of the ARM processor is as follows:

the ARM processor firstly initializes itself, and performs operations such as clock configuration, GPIO port mode configuration, external interrupt configuration, SPI configuration and the like; the ARM processor waits for the liquid crystal display module 8 to send a measurement starting command, and once the measurement starting command is received, the system configures the FPGA4 and the liquid crystal display module 8 through the SPI bus; then the main program enters a main loop to carry out data processing, an end command is checked in the main loop, and once the liquid crystal display module 8 sends configuration information to the ARM processor, the processing is carried out; the FPGA4 is controlled, and the DDS low-frequency module 2 or the PLL high-frequency module 3 is controlled.

The workflow of the user operation is as follows:

as shown in fig. 2, the frequency and the amplitude are set by the liquid crystal touch screen operation or the network sending command operation or the serial port upper computer operation, the ARM processor receives the command and judges whether the frequency is greater than 400MHz, a PLL high-frequency module 3 is configured above 400MHz, and a DDS low-frequency module 2 is configured below 400 MHz. The corresponding amplitude is output by the feedback of the final amplitude through the automatic control amplifier and the detector. And then output through the interface circuit 1.

The working principle of the application is as follows:

the FPGA4 module mainly performs PLL frequency multiplication on an input clock signal of the high-precision constant-temperature crystal oscillator, the frequency of the high-precision constant-temperature crystal oscillator generally selected as the clock module 5 is 10mhz, the constant-temperature crystal oscillator with good short-term stability is selected by the device, and corresponding time scale signals are generated by the FPGA4 and sent to the DDS low-frequency module 2 and the PPL high-frequency module. The ARM processor as the microprocessor 6 is a data processing and control center of the measurement system, and is mainly responsible for the configuration of the FPGA4, the control of the DDS low frequency module 2 and the PLL high frequency module 3 is completed, and the customer selects the frequency and amplitude of the output signal through the network or serial port or liquid crystal screen operation. The microprocessor 6 controls the DDS low frequency module 2 or the PLL high frequency module 3 to generate corresponding signals.

It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus.

Although embodiments of the present application have been shown and described, it will be appreciated by those skilled in the art that changes, modifications, substitutions and alterations can be made in these embodiments without departing from the principles and spirit of the application, the scope of which is defined in the appended claims and their equivalents.

Claims (7)

1. A wide range signal generator device, characterized by: the device comprises an interface circuit (1), a DDS low-frequency module (2), a PLL high-frequency module (3), a clock module (5), a liquid crystal display module (8), an FPGA (4) and a microprocessor (6); interface circuit (1) is connected with DDS low frequency module (2), just interface circuit (1) module with PLL high frequency module (3) are connected, DDS low frequency module (2) with PLL high frequency module (3) are equallyd divide frequently and are linked to FPGA's (4) IO port, clock module (5) are connected to FPGA's (4) clock signal input end, and FPGA (4) are connected with microprocessor (6) that are used for handling information, and microprocessor (6) still link to each other with liquid crystal display module (8).

2. A wide range signal generator device, as claimed in claim 1, wherein: the FPGA (4) and the microprocessor (6) are connected by an SPI bus; the liquid crystal display module (8) and the microprocessor (6) are connected by an SPI bus.

3. A wide range signal generator device, as claimed in claim 1, wherein: the microprocessor (6) adopts an ARM processor.

4. A wide range signal generator device, as claimed in claim 3, wherein: the model selected by the ARM processor is STM32F407VET 6.

5. A wide range signal generator device, as claimed in claim 1, wherein: the clock module (5) adopts a high-precision constant-temperature crystal oscillator packaged by 3627.

6. A wide range signal generator device, as claimed in claim 2, wherein: the liquid crystal display module (8) comprises a 7-inch liquid crystal display screen and a key.

7. A wide range signal generator device, as claimed in claim 1, wherein: the model of the FPGA (4) is selected as EP4CE6E22C 8.

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