CN203617976U

CN203617976U - Touch type multichannel random wave generator

Info

Publication number: CN203617976U
Application number: CN201320746954.8U
Authority: CN
Inventors: 刘一清; 叶昕
Original assignee: East China Normal University
Current assignee: East China Normal University
Priority date: 2013-11-25
Filing date: 2013-11-25
Publication date: 2014-05-28
Anticipated expiration: 2023-11-25

Abstract

The utility model discloses a touch type multichannel random wave generator, comprising a touch screen, a touch screen control circuit, a wave form generation circuit and an amplifying and filtering circuit, the touch screen and the touch screen control circuit are in bidirectional connection, the touch screen control circuit and the waveform generation circuit are in bidirectional connection, and the waveform generation circuit and the amplifying and filtering circuit are in unidirectional connection. The touch type multichannel random wave generator overcomes the defects that an ordinary wave form generator outputs single waveforms, supports less users, and output waveforms have simple functions. A user can input waveform information directly through the touch screen, the waveform generation circuit generates an original waveform, then noise is filtered through the filtering circuit, and a final waveform is generated. The touch type multichannel random wave generator supports a function of synchronous or asynchronous output of 10 paths of waveforms, and can satisfy use of multiple users at the same time. The touch type multichannel random wave generator has the advantages of simple and convenient operation, simple circuit structure, practicability and efficiency, high precision and the like.

Description

A kind of touch multichannel Arbitrary Waveform Generator

Technical field

The utility model relates to the generation device of random waveform, specifically a kind of simultaneously for multi-user's waveshape generating device, according to different user demands, produce various regular shape or irregular waveform, can be applicable to the fields such as industrial precise measurement and control, education experiment.

Background technology

Signal waveform generator is all widely used at aspects such as national defence, industry, teaching.On market, waveform generator is of a great variety, and its domestic signal generator cost is low but performance is not good; Overseas equipment better performances, but price is very expensive.

Various waveform generators have common shortcoming in the market: the waveform catalog 1) producing is few, and existing most waveshape generating devices can only produce fixing several waveforms, for example: the waveform generator having can only produce sine and cosine, triangle, square wave; These waveform generators can not meet the demand of users to different wave.2) waveform generator on market generally only has 1 to 2 passage output waveform, uses so can only meet little user simultaneously.

Utility model content

The purpose of this utility model is a kind of touch multichannel Arbitrary Waveform Generator for multi-user providing for the deficiencies in the prior art.

Realizing the concrete technical scheme of the utility model object is:

A kind of touch multichannel Arbitrary Waveform Generator, feature is: this generator comprises touch-screen, touch screen control circuit, wave generator circuit and amplification and filter circuit, described touch-screen is connected with touch screen control circuit is two-way, touch screen control circuit is connected with wave generator circuit is two-way, and wave generator circuit is with amplification and filter circuit is unidirectional is connected;

Described wave generator circuit comprises that frequency, phase control words produce circuit, D/A change-over circuit and crystal oscillator, wherein, frequency, phase control words produce circuit and are connected by several inner cablings with D/A change-over circuit, and crystal oscillator produces circuit with frequency, phase place word and D/A change-over circuit is connected;

Described amplification and filter circuit comprise connected successively band pass filter, amplifying circuit and low-pass filter circuit.

Compared with prior art, the beneficial effects of the utility model are:

(1) easy to operate: on touch-screen, can directly to draw required waveform shape, comprise square wave, sine wave, sawtooth waveforms or one group of random random waveform.As human-computer interaction terminal, be easy to operate quick by touch-screen.

(2) the waveform catalog producing is many: be not only the conventional waveform such as triangle, sine, the erratic waveform of some waveform shapes also can occur.

(3) wave noise is little: adopt D/A conversion chip that digital waveform is converted to analog waveform, and amplify and low-pass filtering through bandpass filtering, waveform, can greatly reduce the noise of introducing in waveform.

(4) multi-user uses: due to Cost Problems, traditional waveform generator only has 1 to 2 tunnel output.The utility model has changed the structure of traditional wave generator circuit, reduces costs by increasing D/A chip, has the output of Multichannel Waveform, can be for multi-user simultaneously.

Accompanying drawing explanation

Fig. 1 is the utility model outline drawing;

Fig. 2 is the utility model structural representation;

Fig. 3 is the utility model D/A circuit theory diagrams;

Fig. 4 is the utility model touch-screen work block diagram;

Fig. 5 is the utility model workflow diagram;

Fig. 6 is that the utility model produces waveform schematic diagram.

Embodiment

Consult Fig. 1, the utility model profile can be divided into containment vessel 4, touch-screen 1, internal circuit 2 and output waveform passage 3.

Consult Fig. 2, the utility model is made up of touch-screen, touch screen control circuit, wave generator circuit and amplification and filter circuit, and touch screen control circuit is connected with wave generator circuit is two-way.On internal circuit board, touch screen control circuit passes to frequency, phase control words generation circuit by data by 8Pin connecting line; In wave generator circuit, frequency, phase control words produce circuit and are connected by 8 inner cablings with D/A change-over circuit, and the frequency of generation, phase control words are passed to D/A change-over circuit; Crystal oscillator produces circuit with frequency, phase control words and D/A change-over circuit is connected, and both are provided required clock; Wave generator circuit is given the primary signal unidirectional delivery producing to amplify and filter circuit, wherein, and successively by band pass filter, amplifying circuit and 7 rank low-pass filter circuits; Exporting to user by the final waveform amplifying and filter circuit produces by 10 passages uses; Power supply is supplied with the voltage of 3.3V and 5V the various piece of internal circuit.

Touch-screen of the present utility model and touch screen control circuit: as master controller, coordinate touch-screen to use by S3C2440 chip; Touch-screen as with the platform of user interactions, user can input parameter information or the drawing waveforms shape of waveform on touch-screen.

Wave generator circuit: utilize DDS (Direct Digital Synthesizer) Direct Digital frequency synthesis technique, built circuit, mainly formed by cyclone III series programmable chip and 10 D/A chips of altera corp.Wherein cyclone III family chip act as frequency, the phase control words of output waveform; In D/A circuit, 10 AD9744 chips, produce original waveform using control word as input.This novel circuit has the features such as cost is low, low in energy consumption, generation speed is fast, can produce 10 road waveforms simultaneously.

Power unit: be touch-screen, circuit and chip power supply, the supply power voltage of its output is 5V and 3.3V, mainly produces controllable voltage by LM2596.

Filtering and amplifying circuit: for the waveform filtering noise of D/A circuit output, mainly formed by band pass filter, amplifying circuit and 7 rank low pass filters.

Consult Fig. 3, this figure is D/A circuit theory diagrams, and it is the high accuracy DAC chip AD9744 of 14, needs power supply to provide the voltage of 3.3V to drive.

Consult Fig. 4, this figure is touch-screen work block diagram, and user's operation is divided into two kinds of patterns: can produce conventional waveform by the mode of parameters, as: sine and cosine, triangular wave, staircase waveform etc.; Also can draw and input the waveform that obtains arbitrary shape by hand.

Consult Fig. 5, this figure is workflow diagram, detailed process:

1) initialization apparatus, to circuit reset, system start power supply etc.

2) touch-screen and control circuit are carried out to initialization.

3) user starts to arrange parameter, the shape of waveform.

4) produce the required waveform of user by wave generator circuit.

5) original waveform after filtering with the denoising of amplifying circuit, output.

6) the whether normal output waveform of checkout equipment, if undesired operation again, if normally finish.

Consult Fig. 6, the oscillogram for the utility model generation shown in this figure; Can produce sine wave, staircase waveform, trapezoidal wave of regular shape etc., also can produce random waveform in irregular shape.

Claims

1. a touch multichannel Arbitrary Waveform Generator, it is characterized in that this generator comprises touch-screen, touch screen control circuit, wave generator circuit and amplification and filter circuit, described touch-screen is connected with touch screen control circuit is two-way, touch screen control circuit is connected with wave generator circuit is two-way, and wave generator circuit is with amplification and filter circuit is unidirectional is connected; Described wave generator circuit comprises that frequency, phase control words produce circuit, D/A change-over circuit and crystal oscillator, wherein, frequency, phase control words produce circuit and are connected by several inner cablings with D/A change-over circuit, and crystal oscillator produces circuit with frequency, phase control words and D/A change-over circuit is connected; Described amplification and filter circuit comprise connected successively band pass filter, amplifying circuit and low-pass filter circuit.