CN104104363A

CN104104363A - Function signal generator

Info

Publication number: CN104104363A
Application number: CN201410341281.7A
Authority: CN
Inventors: 章隆泉; 过俊宏; 顾肖红
Original assignee: Wuxi Chongan District Technology Innovation Service Center
Current assignee: Wuxi Chongan District Technology Innovation Service Center
Priority date: 2014-07-17
Filing date: 2014-07-17
Publication date: 2014-10-15

Abstract

The invention discloses a function signal generator which comprises a control module, a DDS chip used for generating waveforms, a man-machine interaction interface used for man-machine interaction, an amplification circuit used for amplifying output waveform voltage, an analog-digital converter used for converting a digital signal to an analog signal and a comparator used for generating square waves. The display module, the man-machine interaction interface and the DDS chip are connected with corresponding ports of the control module respectively, and the input end of a waveform output module and the input end of the comparator are respectively connected with the input end of the DDS chip. The function signal generator is simple in structure, low in power consumption, high in integration and good in performance, sine waves, triangular waves and square waves can be generated, the waveform frequency resolution is extremely high, and frequency and amplitude can be controlled in a digital mode.

Description

A kind of function signal generator

Technical field

The present invention relates to a kind of function signal generator.

Background technology

In the exploitation or work of electronic system, always need the time dependent signal of various amplitudes to be used as test signal or input signal, it can be sine wave, digit pulse, binary system pattern or other analog functions etc., and the equipment of generation sort signal is called signal generator.Function signal generator refers to that generation amplitude, waveform and waveform frequency determine the instrument of adjustable electron signal, is born in the twenties in 20th century, is one of most important equipment in electronic circuit.Signal generator is widely used, of a great variety, and performance is different, classifies also not the same.According to frequency range classification, can be divided into: Signal Generator of Ultra-low Frequency, low frequency generator, flying-spot video generator, high frequency waveforms generator, very high frequency(VHF) waveform generator and UHF signal generator.

Mention electronic measurements, possible people's the first reaction is exactly logic analyzer or oscilloscope, but the two just amplifies the signal of receiving to show in circuit.In any electronic measurements, guarantee that the hardware of exploitation meets design specification, need input test signal and measuring instrument, at this moment, signal generator has just been played the part of this role of signal source.Amplitude, frequency and phase place are the main attributes of waveform, and amplitude is to weigh the index of waveform voltage intensity; Frequency is the speed that wave period occurs, and frequency and cycle are inversely proportional to, and frequency is higher, and the cycle is less; Phase place is that wave period is with respect to the position of 0 degree point.Waveform generator generally can be all above parameters regulate.

The maturation of modern electronic technology, various electronic equipments are developed, and electronic measurements is also more and more higher to the requirement of signal generator, and early stage single function, the signal generator that error is large, volume is heavy can not meet modern surveying demand.

Summary of the invention

Technical problem to be solved by this invention be for the deficiencies in the prior art provide a kind of simple in structure, low in energy consumption, integrated level is high, performance good, can produce sine wave, triangular wave, square wave, and waveform frequency resolution is high, frequency and amplitude can realize the function signal generator of Digital Control simultaneously.

The present invention is for solving the problems of the technologies described above by the following technical solutions

A kind of function signal generator, comprise control module, for generation of the DDS chip of waveform, for the human-computer interaction interface of man-machine interaction, for amplifying the amplifying circuit of output waveform voltage, for digital signal being converted to the analog to digital converter of analog signal, for generation of the comparator of square wave; Described display module, human-computer interaction interface, DDS chip are connected on the corresponding port of control module, and the input of described waveform output module and comparator is connected the input of DDS chip.

Preferably, described control module is ATmega32 single-chip microcomputer.

Preferably, described DDS chip is AD9834.

Preferably, described human-computer interaction interface comprises display module and input keyboard module, on the corresponding port of described display module and input keyboard module difference link control module.

Preferably, described display module is 12864 LCDs.

The present invention adopts above technical scheme compared with prior art, has following technique effect:

1, simple in structure, low in energy consumption, integrated level is high, performance good;

2, can produce sine wave, triangular wave, square wave;

The frequency that 3, can produce signal is at 100Hz-200KHz, and frequency is supported coarse adjustment and fine tuning;

4, realize a kind of wave-shape amplitude peak-to-peak value adjustable at 0-5V;

5, error is less than 5%; Frequency and amplitude can be realized and Digital Control can be realized.

Accompanying drawing explanation

Fig. 1 is structural representation of the present invention;

Fig. 2 is the structural representation of ATmega32 single-chip microcomputer of the present invention;

Fig. 3 is the structural representation of AD9834DDS chip of the present invention;

Fig. 4 is amplifying circuit schematic diagram of the present invention.

Embodiment

Below in conjunction with accompanying drawing, technical scheme of the present invention is described in further detail:

As shown in Figure 1, a kind of function signal generator, comprise control module, for generation of the DDS chip of waveform, for the human-computer interaction interface of man-machine interaction, for amplifying the amplifying circuit of output waveform voltage, for digital signal being converted to the analog to digital converter of analog signal, for generation of the comparator of square wave; Described display module, human-computer interaction interface, DDS chip are connected on the corresponding port of control module, and the input of described waveform output module and comparator is connected the input of DDS chip.Described control module is preferably selected ATmega32 single-chip microcomputer, described DDS chip selects AD9834, described human-computer interaction interface comprises display module and input keyboard module, on the corresponding port of described display module and input keyboard module difference link control module, described display module can select 12864 LCDs.

The waveform generation device that the present invention selects is DDS chip AD9834, usings ATmega32 single-chip microcomputer as the control centre of whole system, the LCDs 12864 of output equipment select tape Chinese word library, and input scheme adopts touch key.AD9834 can directly produce sine wave, triangular wave, then sine wave is delivered to the high-speed comparator of AD9834, obtains square wave.Because the waveform voltage of AD9834 output is less than normal, so utilize operational amplification circuit to be amplified to suitable magnitude of voltage, then deliver to the reference voltage end of analog-digital chip 7513, by ATmega32, controlled the range value of DAC chip, thereby realize amplitude numerical control, and waveform frequency writes while being communicated by letter with AD9834 by ATmega32.

As shown in Figure 2, ATmega32 is a high-performance designed and developed of atmel corp, 8 AVR single-chip microcomputers of low-power consumption.ATmega32 has Reduced Instruction Set Computer Architecture, supports more than 100 directive command, and much instruction execution cycle is single, and there are 32 8 general purpose working registers inside.Advanced technology brings up advanced chip, and when ATmega32 is operated in 16MHz, performance, up to 16MIPS, only needs 2 clock cycle just can realize hardware multiplication.Aspect memory, ATmega32 has non-volatile RAM and ROM, the Flash able to programme of 32K byte, and erasing and writing life has reached 10,000 times, and the EEPROM of 1024Byte allows ATmega32 further strengthened especially simultaneously.

As shown in Figure 3, AD9834 is a low-power consumption DDS chip that ANALOG DEVICES company designs and produces, and can produce high performance sine and involve triangular wave, has also been with a high-speed comparator, for generation of square wave in sheet simultaneously.AD9834 is by three-wire type serial line interface data writing, the speed communication of the highest support 40MHz, and compatible with the microcontroller such as single-chip microcomputer.After the sine wave process RC low pass filter that DDS produces, the voltage waveform that the amplitude of obtaining is 0.6V.Output current is delivered to VIN end through 300 Ω resistance simultaneously and receive inner high speed comparator, at SIGN BIT OUT end, can obtain a square-wave signal with sinusoidal wave same frequency.SCLK, FSYNC, these holding wires of SDATA, directly receive the port of single-chip microcomputer.RESET pin is the resetting pin of AD9834, owing to having accessed the crystal oscillator of 50MHz, so RESET pin is received to GND by 2.7K Ω resistance, by 10uF electric capacity, receive VCC simultaneously, powered on moment, to high level of RESET, resets it like this, after electric capacity charges electricity by the time, RESET, by grounding through resistance, is always low level.

As shown in Figure 4, the magnitude of voltage of exporting due to AD9834 only has 0.6V, so need to design an in-phase proportion amplifying circuit, voltage amplification, to 5V, is then sent to the reference voltage end of DAC7513.Because the waveform voltage of AD9834 output is less than normal, so utilize operational amplification circuit to be amplified to suitable magnitude of voltage, then deliver to the reference voltage end of analog-digital chip 7513, by ATmega32, controlled the range value of DAC chip, thereby realize amplitude numerical control, and waveform frequency writes while being communicated by letter with AD9834 by ATmega32.

Claims

1. a function signal generator, it is characterized in that: comprise control module, for generation of the DDS chip of waveform, for the human-computer interaction interface of man-machine interaction, for amplifying the amplifying circuit of output waveform voltage, for digital signal being converted to the analog to digital converter of analog signal, for generation of the comparator of square wave; Described display module, human-computer interaction interface, DDS chip are connected on the corresponding port of control module, and the input of described waveform output module and comparator is connected the input of DDS chip.

2. function signal generator according to claim 1, is characterized in that: described control module is ATmega32 single-chip microcomputer.

3. function signal generator according to claim 1, is characterized in that: described DDS chip is AD9834.

4. function signal generator according to claim 1, is characterized in that: described human-computer interaction interface comprises display module and input keyboard module, and described display module and input keyboard module are respectively on the corresponding port of link control module.

5. function signal generator according to claim 4, is characterized in that: described display module is 12864 LCDs.