CN206362858U - A kind of waveform based on FPGA is produced and frequency measurement portable instrument - Google Patents

Abstract

The utility model is related to a kind of waveform based on FPGA and produced and frequency measurement portable instrument, belongs to the electronic information technical field such as signal transacting and measurement, Analog Circuit Design.Include agc circuit module, comparison circuit module, FPGA processor module, key-press module, display screen, filter circuit module and D/A modules；The output end of agc circuit connects the input of comparison circuit module, the output end of comparison circuit module, the output end of key-press module respectively connect the input of FPGA processor module, the output end of FPGA processor module connects the input of display screen, the input of D/A modules respectively, and the output end of D/A modules connects the input of filter circuit module.The combining form of single-chip microcomputer plus DDS chips is instead of by monolithic fpga chip, the function of waveform generation is realized, realizes frequency measurement function, the function of instrument is enhanced, number of devices, which is reduced, causes equipment instrument reduces to be easy to carry, and strengthens the convenience of instrument.

Description

A kind of waveform based on FPGA is produced and frequency measurement portable instrument

Technical field

The utility model is related to a kind of waveform based on FPGA and produced and frequency measurement portable instrument, belongs to signal transacting With the electronic information technical field such as measurement, Analog Circuit Design.

Background technology

In recent years, DDS technologies are frequently used in electronic design process.Be widely used in radar system, digital communication, In the equipment such as electronic surveying, it has frequency resolution high, and phase noise is low, broader bandwidth, the advantages of purity of frequency spectrum is good.Will letter Number generator and frequency meter are combined, and can meet experiment needs in most cases.And small-scale electronic design engineering Place is not fixed, so portable instrument is needed, so that designer can carry out Electronic Design under various places Experiment.

Chinese patent CN201610169562.8 discloses a kind of AWG based on PXle buses, waveform life Include into part：FPGA and crystal oscillator, waveform conditioning part include：16 DAC, operational amplifier, SPI programmable amplifiers, filtering The program control DAC of circuit, SPI, differential operational amplifier and subtracter；This patent carries out waveform by the way of host computer down-transmitting data Produce, the convenience that instrument is used is reduced, it is impossible to constitute a complete instrument and equipment, while this system is without frequency measurement work( Energy；

Chinese patent CN201420211177.1 is disclosed on a kind of optional waveform generator, including touch-screen, piece System, synchronous DRAM, flash storage and dac channel.This patent has directly used integrated DDS module (direct digital synthesiser）, DDS module is controlled by embeded processor, the resource of processor is not only wasted, also increases The redundancy of system, and this invention is also that simple waveform produces function, no frequency measurement function.

Chinese patent CN201610311499.7 discloses a kind of equally accurate digital frequency meter and its measuring method, including treats Survey signal input interface, agc circuit, high-speed comparator, CPLD, single-chip microcomputer and display.Its place carried out to measurement data Reason method is especially good, can reach very high precision, but its used device is excessive, only realizes simple frequency measurement work( Can, cost is higher, and without generation waveform function.

Utility model content

Technical problem to be solved in the utility model is to overcome the defect of prior art there is provided a kind of ripple based on FPGA Shape is produced and frequency measurement portable instrument, using FPGA processor as core devices, can substitute single-chip microcomputer and CPLD Combination, not only reduces element, and realize waveform generation and frequency measurement function.

To reach above-mentioned purpose, the utility model provides a kind of waveform based on FPGA and produced and the portable instrument of frequency measurement Device, it is characterised in that including agc circuit module, comparison circuit module, FPGA processor module, key-press module, display screen, filter Wave circuit module and D/A modules；The output end of the agc circuit connects the input of the comparison circuit module, the comparison The output end of circuit module, the output end of the key-press module respectively connect the input of the FPGA processor module, institute The output end for stating FPGA processor module connects the input of the display screen, the input of the D/A modules, the D/ respectively The output end of A modules connects the input of the filter circuit module.

Preferentially, including signal input module and signal output module；The output end connection institute of the signal input module The input of agc circuit module is stated, the input of the signal output module connects the output end of the filter circuit module.

Preferentially, including framework, the signal input module includes signal input interface, and the signal output interface includes Waveform output interface, the key-press module include waveform parameter select button, frequency measurement select button, frequency increase button, Frequency reduces button, amplitude increase button, amplitude and reduces button and duty cycle adjustment button, the signal input interface, described Waveform output interface is fixedly installed in the framework, the waveform parameter select button, frequency measurement select button, frequency Increase button, frequency reduce button, amplitude increase button, amplitude reduction button and duty cycle adjustment button and respectively passed through and sliding The dynamic connection framework.

Preferentially, in addition to attaching plug, the attaching plug electricity is electrically connected the agc circuit module, the ratio Compared with circuit module, the FPGA processor module, the display screen, the filter circuit module and the D/A modules.

The beneficial effect that the utility model is reached：

The combining form of single-chip microcomputer plus DDS chips is instead of by monolithic fpga chip, the number of devices of instrument is reduced, it is real The function of waveform generation is showed, has saved resource, improved integrated level；Single-chip microcomputer is instead of by the fpga chip of single-chip microcomputer to add CPLD combining form, realizes frequency measurement function, enhances the function of instrument, disclosure satisfy that most of electronic design experiments The need for, have broad application prospects；Two big functions are integrated, number of devices, which is reduced, causes equipment instrument to reduce just In carrying, handling time has been saved, has strengthened the convenience of instrument.

Brief description of the drawings

Fig. 1 is theory diagram of the present utility model.

Fig. 2 is structure chart of the present utility model.

Implication, 1- signal input interfaces are marked in accompanying drawing；2- display screens；3- waveform output interfaces；4- waveform parameters are selected Button；5- frequency measurement select buttons；6- power switches；7- frequencies increase button；8- frequencies reduce button；9- amplitude increases are pressed Button；10- amplitudes reduce button；11- duty cycle adjustment buttons；12- attaching plugs.

Embodiment

The utility model is further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating this The technical scheme of utility model, and protection domain of the present utility model can not be limited with this.

The utility model provides a kind of waveform based on FPGA and produced and frequency measurement portable instrument, it is characterised in that Including agc circuit module, comparison circuit module, FPGA processor module, key-press module, display screen, filter circuit module and D/A Module；The output end of the agc circuit connects the input of the comparison circuit module, the output of the comparison circuit module End, the output end of the key-press module respectively connect the input of the FPGA processor module, the FPGA processor mould The output end of block connects the input of the display screen, the input of the D/A modules, the output end of the D/A modules respectively Connect the input of the filter circuit module.

Further, the utility model includes signal input module and signal output module；The signal input module Output end connects the input of the agc circuit module, and the input of the signal output module connects the filter circuit mould The output end of block.

Further, the utility model includes framework, and the signal input module includes signal input interface, the signal Output interface include waveform output interface, the key-press module include waveform parameter select button 4, frequency measurement select button 5, Frequency increase button 7, frequency reduce button 8, amplitude increase button 9, amplitude and reduce button 10 and duty cycle adjustment button 11, institute Signal input interface, the waveform output interface is stated to be fixedly installed in the framework, the waveform parameter select button 4, Frequency measurement select button 5, frequency increase button 7, frequency reduce button 8, amplitude increase button 9, amplitude and reduce the and of button 10 Duty cycle adjustment button 11 is respectively passed through and the framework that is slidably connected.

Further, the utility model also includes attaching plug, and the attaching plug electricity is electrically connected the agc circuit Module, the comparison circuit module, the FPGA processor module, the display screen, the filter circuit module and the D/A Module.

The course of work：

Waveform signal is inputted by signal input interface, and carrying out conditioning by agc circuit module causes signal amplitude in AGC In circuit module, comparison circuit module, FPGA processor module, filter circuit module and the accessible scope of D/A modules, then The manageable pulse signals of FPGA are converted the signal into by comparison circuit module, then entered output of pulse signal to FPGA Row Data Management Analysis simultaneously shows measurement result on a display screen；The waveform signal includes sine wave, square wave, sawtooth waveforms, three The waveform signals such as angle ripple.

When output waveform signals, pass through the waveform parameter select button 4, frequency measurement select button 5, frequency increase Button 7, frequency reduce button 8, amplitude increase button 9, amplitude and reduce button 10 and the regulation waveform ginseng of duty cycle adjustment button 11 Number, then FPGA processor module output waveform data is to D/A modules, and digital quantity is converted into analog signal by D/A modules, then By filter circuit module filtering clutter, required pure waveform signal is finally exported to other electronic instruments.

As shown in Fig. 2 when user uses the instrument, switch on power plug 12, power switch 6 is pressed, instrument is in and treated Machine state；When needing output waveform, parameter selection is carried out by 4 pairs of waveforms to be exported of waveform parameter selection key first, Then coordinate frequency increase button 7 or frequency to reduce button 8, amplitude increase button 9 or amplitude and reduce button 10, dutycycle Regulation button 11 enters line frequency, amplitude, dutycycle setting.Now just there is corresponding waveform signal to export in output interface, can be with Pick out to various electronic systems；When needing to measure the relevant parameter of input signal, press frequency measurement select button 5 and open frequency Rate measures function, realizes page layout switch.It is seen that measurement result on LCDs 2 after access signal.

Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art For art personnel, on the premise of the utility model technical principle is not departed from, some improvement and deformation can also be made, these change Enter and deform and also should be regarded as protection domain of the present utility model.

Claims (4)

1. a kind of waveform based on FPGA is produced and frequency measurement portable instrument, it is characterised in that including agc circuit module, Comparison circuit module, FPGA processor module, key-press module, display screen, filter circuit module and D/A modules；The agc circuit Output end connect the input of the comparison circuit module, the output end of the comparison circuit module, the key-press module Output end respectively connects the input of the FPGA processor module, and the output end of the FPGA processor module is connected respectively The input of the input of the display screen, the D/A modules, the output end of the D/A modules connects the filter circuit mould The input of block.

2. a kind of waveform based on FPGA according to claim 1 is produced and frequency measurement portable instrument, its feature exists In, including signal input module and signal output module；The output end of the signal input module connects the agc circuit module Input, the input of the signal output module connects the output end of the filter circuit module.

3. a kind of waveform based on FPGA according to claim 2 is produced and frequency measurement portable instrument, its feature exists In including framework, the signal input module includes signal input interface, and the signal output interface includes waveform output and connect Mouthful, the key-press module includes waveform parameter select button (4), frequency measurement select button (5), frequency increase button (7), frequency Rate reduces button (8), amplitude increase button (9), amplitude and reduces button (10) and duty cycle adjustment button (11), and the signal is defeated Incoming interface, the waveform output interface are fixedly installed in the framework, and the waveform parameter select button (4), frequency are surveyed Measure select button (5), frequency increase button (7), frequency and reduce button (8), amplitude increase button (9), amplitude reduction button (10) respectively passed through and the framework that is slidably connected with duty cycle adjustment button (11).

4. a kind of waveform based on FPGA according to claim 1 is produced and frequency measurement portable instrument, its feature exists In, in addition to attaching plug, the attaching plug is electrically connected the agc circuit module, the comparison circuit module, described FPGA processor module, the display screen, the filter circuit module and the D/A modules.