CN103078612A - Method for generating pulse signal by using analog switch - Google Patents
Method for generating pulse signal by using analog switch Download PDFInfo
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- CN103078612A CN103078612A CN2012105893013A CN201210589301A CN103078612A CN 103078612 A CN103078612 A CN 103078612A CN 2012105893013 A CN2012105893013 A CN 2012105893013A CN 201210589301 A CN201210589301 A CN 201210589301A CN 103078612 A CN103078612 A CN 103078612A
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Abstract
The invention discloses a method for generating a pulse signal by using an analog switch. The method comprises the following steps of: finishing control over a DAC (Digital-to-Analog Converter) and the analog switch by taking a CPU (Central Processing Unit) as a control core; controlling an analog signal output by the DAC through the CPU for presetting an amplitude range of an output pulse signal; and controlling action of the analog switch through an IO (Input Output) pin of the CPU for changing the width and the frequency of the output pulse signal. The invention provides a method for generating a pulse signal with variable amplitude, variable frequency and variable width by switching an analog signal with an analog switch. According to the method, the DAC is controlled through the processor CPU to output the analog signal with variable amplitude, then on and off of the analog switch are controlled by the CPU to switch the analog signal, and the continuously changing analog signal is changed into a required pulse signal to be output.
Description
Technical field
The present invention relates to a kind of method of utilizing analog switch to produce pulse signal, be specifically related to a kind of method of how utilizing processor control simulation switch on and off and switching the variable pulse signal of continuous analog signal generation variable-magnitude, changeable frequency, variable-width and polarity.
Background technology
Analog switch is the device of in recent years extensive use, and it has, and conducting resistance is low, switching speed is fast, volume is little, low in energy consumption, high reliability, system cost are low, flexibility is convenient to well the characteristics such as connection, thereby is used widely in modern electronic technology.In embedded system, it switches through being usually used in signal.Particularly in recent years along with its conducting resistance is more and more lower, from original ohms up to a hundred to tens ohm, till now several ohm even less than one Europe again, the decay of signal becomes very little on switch, and the ability by electric current is increased to the hundreds of milliampere from original tens milliamperes.In addition, switching speed is more and more faster, and from hundred nanosecond of original one-tenth being reduced to tens or even several nanosecond, these have all brought widely to analog switch and have used.
Pulse signal method for designing commonly used has two kinds now.A kind of is traditional oscillating circuit method, namely utilizes monostable flipflop to produce, because the more needs of signal burr that produce carry out shaping.Although this method circuit is simple, precision and stability is poor, and is affected by environment larger, and signal amplitude is difficult to regulate, and can't link to each other with processor, is not suitable for modern embedded system control.Another kind method is to adopt digital frequency synthesizer DDS, and this is after direct frequency synthesis and indirect frequency synthesis, the third generation frequency synthesis technique that develops rapidly along with the development of digital integrated circuit and microelectric technique.It is take digital signal processing theory as the basis, carry out frequency synthesis from the amplitude-phase relation of signal, the frequency switching time that is characterized in having high frequency resolution, extremely lacks, very wide relative bandwidth, fan-out capability and the Digital Modulation function of random waveform, be suitable for very much the High-speed frequency hopping communication field, but the cost of this method is higher, programming is trouble, is not suitable for the occasion to cost sensitivity, can not satisfy users on diversity.
Summary of the invention
The object of the present invention is to provide a kind of method of utilizing analog switch to produce pulse signal, the analog signal that it changes by processor CPU control digital to analog converter DAC output amplitude, then CPU control simulation switch on and off becomes periodic output of pulse signal to the continually varying analog signal to switch this analog signal.
Technical solution of the present invention is:
A kind of method of utilizing analog switch to produce pulse signal, its special character be, the method specifically:
1] take CPU as control core, finishes the control to DAC and analog switch;
Amplitude, frequency and polar requirement according to output pulse signal are selected suitable CPU, DAC and analog switch; Low speed pulse output requirement during CPU satisfies; If only output single-pole pulse selects general analog switch all can meet the demands so; If the output bipolar pulse, should select so can be by the switch of negative voltage;
2] analog signal of exporting by CPU control DAC is in order to preset the amplitude range of output pulse signal;
If the DAC that selects is the concurrent working mode, then hang on the cpu data bus; If the work in series mode then is connected on the general purpose I/O pin of CPU; The figure place of DAC has determined the precision of output pulse amplitude, and the higher then precision of figure place is higher; Generally speaking, 8 to 10 DAC can meet the demands.
3] action of the IO pin control simulation switch by CPU is in order to change output pulse signal
Amplitude, width and frequency;
Certain IO pin of CPU is received on the analog switch control end, and called after is CONTRL_EN;
4] the DAC output signal pin that will use is directly received on the input pin of analog switch.Pulse signal is exported from the output pin of this analog switch.
5] write code, at the waveform of the continuous exporting change of runtime chien shih DAC, and control CONTRL_EN is not
Export high-low level disconnectedly and cooperate, can obtain the pulse amplitude, width and the frequency that need.
The above-mentioned method of utilizing analog switch to produce pulse signal is characterized in that: if improve the amplitude of output pulse signal, can add in the pulse signal rear end of output so and use operational amplifier, adjust multiplication factor and get final product to desired value.
Above-mentioned analog switch refers to the analog switch of various frequencies.
Above-mentioned CPU is the AT89C51 of atmel corp; Described analog switch is the ISL54062 of Intersil company.
The invention has the advantages that:
1. cost is low, and circuit design and debugging are simpler easier.
2. high flexibility.Particularly pulse signal waveform can be changed at any time, bipolar pulse can be exported.
3. the output pulse signal edge is precipitous, fast response time.Compole is short when rising edge and trailing edge, need not shaping.
4. programming is simple.Need not in advance the Wave data that will export to be placed in the special memory, only needing constantly to change the DAC output valve is the waveform of exportable needs.
Description of drawings
Fig. 1 is the system architecture diagram of output pulse signal;
Fig. 2 is the pulse signal waveform figure of output arbitrary sequence;
Fig. 3 is for increasing the system architecture diagram after output amplitude is regulated.
Embodiment
The present invention is: connect a digital to analog converter DAC at CPU, CPU is according to the pre-designed given analog quantity of program control DAC output.Then, the CPU action of switching analog signals by self certain IO pin control simulation switch.CPU finally produces a series of orderly pulse signals by constantly control switch action.
Detailed process of the present invention is:
1] selects suitable CPU, DAC and analog switch according to the requirements such as amplitude, frequency and polarity of output pulse signal.General CPU, for example the AT89C51 of atmel corp can satisfy middle low speed pulse output requirement.If only output single-pole pulse selects general analog switch all can meet the demands so.If the output bipolar pulse, should select so can be by the switch of negative voltage.The ISL54062 of optional Intersil company for example, this switch can be by being lower than the signal of supply voltage 7V.
2] if the DAC that selects is the concurrent working mode, then hang on the cpu data bus; If the work in series mode then is connected on the general purpose I/O pin of CPU.The figure place of DAC has determined the precision of output pulse amplitude, and the higher then precision of figure place is higher.Generally speaking, 8 to 10 DAC can meet the demands.For example, 8 ADC transducer ADC0802.
3] certain IO pin of CPU is received on the analog switch control end (temporarily CONTRL_EN by name).
4] the DAC output signal pin that will use is directly received on the input pin of analog switch.Pulse signal is exported from the output pin of this analog switch.
5] available any language is write code such as compilation, C language etc., at the waveform of the continuous exporting change of runtime chien shih DAC, and controls CONTRL_EN and constantly exports the high-low level cooperation, can obtain the pulse amplitude, width and the frequency that need.Referring to attached Fig. 1 and 2.
6] if the amplitude of raising output pulse signal can add in the pulse signal rear end of output so and use operational amplifier that the adjustment multiplication factor gets final product to desired value.Referring to accompanying drawing 3.
Claims (4)
1. a method of utilizing analog switch to produce pulse signal is characterized in that, the method specifically:
1] take CPU as control core, finishes the control to DAC and analog switch;
Amplitude, frequency and polar requirement according to output pulse signal are selected suitable CPU, DAC and analog switch; Low speed pulse output requirement during CPU satisfies; If only output single-pole pulse selects general analog switch all can meet the demands so; If the output bipolar pulse, should select so can be by the switch of negative voltage;
2] analog signal of exporting by CPU control DAC is in order to preset the amplitude range of output pulse signal;
If the DAC that selects is the concurrent working mode, then hang on the cpu data bus; If the work in series mode then is connected on the general purpose I/O pin of CPU; The figure place of DAC has determined the precision of output pulse amplitude, and the higher then precision of figure place is higher; Generally speaking, 8 to 10 DAC can meet the demands;
3] action of the IO pin control simulation switch by CPU is in order to change output pulse signal
Width and frequency;
Certain IO pin of CPU is received on the analog switch control end, and called after is CONTRL_EN;
4] the DAC output signal pin that will use is directly received on the input pin of analog switch;
Pulse signal is exported from the output pin of this analog switch;
5] write code, at the waveform of the continuous exporting change of runtime chien shih DAC, and control CONTRL_EN and constantly export the high-low level cooperation, can obtain the pulse amplitude, width and the frequency that need.
2. the described method of utilizing analog switch to produce pulse signal according to claim 1, it is characterized in that: if improve the amplitude of output pulse signal, can add in the pulse signal rear end of output so and use operational amplifier, adjust multiplication factor and get final product to desired value.
3. the described method of utilizing analog switch to produce pulse signal according to claim 1 and 2, it is characterized in that: described analog switch refers to the analog switch of various operating frequencies.
4. the described method of utilizing analog switch to produce pulse signal according to claim 3, it is characterized in that: described CPU is the AT89C51 of atmel corp; Described analog switch is the ISL54062 of Intersil company.
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| CN2012105893013A CN103078612A (en) | 2012-12-31 | 2012-12-31 | Method for generating pulse signal by using analog switch |
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| CN2012105893013A CN103078612A (en) | 2012-12-31 | 2012-12-31 | Method for generating pulse signal by using analog switch |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245208A (en) * | 2015-09-28 | 2016-01-13 | 宁波帝洲自动化科技有限公司 | Bipolar voltage output circuit |
Citations (5)
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| US5898342A (en) * | 1998-01-20 | 1999-04-27 | Advanced Micro Devices | Power amplifier arrangement and method for data signal interface |
| CN101047371A (en) * | 2007-03-19 | 2007-10-03 | 成都理工大学 | Full digital sliding pulse signal generator |
| CN101127152A (en) * | 2007-09-30 | 2008-02-20 | 山东科技大学 | Coding signal generator and radio remote control device for robot and animal control |
| US7423474B2 (en) * | 2003-05-23 | 2008-09-09 | Broadcom Corporation | Selectable pole bias line filter |
| CN202459848U (en) * | 2012-02-28 | 2012-10-03 | 吉林大学 | Impulse electronic therapeutic meter |
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2012
- 2012-12-31 CN CN2012105893013A patent/CN103078612A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US5898342A (en) * | 1998-01-20 | 1999-04-27 | Advanced Micro Devices | Power amplifier arrangement and method for data signal interface |
| US7423474B2 (en) * | 2003-05-23 | 2008-09-09 | Broadcom Corporation | Selectable pole bias line filter |
| CN101047371A (en) * | 2007-03-19 | 2007-10-03 | 成都理工大学 | Full digital sliding pulse signal generator |
| CN101127152A (en) * | 2007-09-30 | 2008-02-20 | 山东科技大学 | Coding signal generator and radio remote control device for robot and animal control |
| CN202459848U (en) * | 2012-02-28 | 2012-10-03 | 吉林大学 | Impulse electronic therapeutic meter |
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105245208A (en) * | 2015-09-28 | 2016-01-13 | 宁波帝洲自动化科技有限公司 | Bipolar voltage output circuit |
| CN105245208B (en) * | 2015-09-28 | 2018-05-29 | 宁波帝洲自动化科技有限公司 | A kind of bipolar voltage output circuit |
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Application publication date: 20130501 |