CN101350619A - Acousto-optic driver base on direct digital synthesis technology - Google Patents
Acousto-optic driver base on direct digital synthesis technology Download PDFInfo
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- CN101350619A CN101350619A CNA2008101206133A CN200810120613A CN101350619A CN 101350619 A CN101350619 A CN 101350619A CN A2008101206133 A CNA2008101206133 A CN A2008101206133A CN 200810120613 A CN200810120613 A CN 200810120613A CN 101350619 A CN101350619 A CN 101350619A
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Abstract
The present invention relates to an acousto-optic driver based on the technology of Direct Digital Synthesis (DDS), and consists of a frequency synthesizer (1), a logic controller (2), a reference clock (3), a radio frequency control and amplification device (4), and a power management module (5). The logic controller is connected with the frequency synthesizer; under the control of the logic controller, the frequency synthesizer can transmit waveforms of frequency and amplitude, and provide the display state of liquid crystal display; the reference clock is connected with the frequency synthesizer, and is used for providing signals of the reference clock for the frequency synthesizer; the radio frequency control and amplification device is connected with the frequency synthesizer, and is used for amplifying and transmitting the high-frequency signals generated by the frequency synthesizer; the power management module is connected with the power supply with each device. The acousto-optic driver has the advantages of wide driving frequency band, high frequency accuracy, high resolution, and excellent frequency stability, and is suitable for various acousto-optic devices and ultrasonic devices of high-frequency and radio-frequency bands.
Description
Technical field
The present invention relates to a kind of acousto-optic driver, particularly based on the acousto-optic driver of Direct Digital synthetic technology (DDS).
Background technology
In a lot of fields of industry, scientific research, acousto-optical device all has a lot of application, for example: fast spectral analysis, acousto-optic Q modulation laser, acousto-optic shift frequency, acousto-optic copped wave, acousto-optic active mode locking laser or the like.Original acousto-optic driver mainly is made up of with amplifier two parts the frequency synthesizer and the radio frequency control of VCO.Adopt voltage controlled oscillator (VCO) as tunable frequency synthesizer traditionally, by applying different voltage control output frequencies, the radiofrequency signal of output is carried out power amplification by radio frequency control with amplifier.Such acousto-optic driver output frequency is accurate inadequately, and is stable, and its frequency drift often reaches several megahertzes, and need additionally provide one accurately when using, and stable analog control voltage is very inconvenient.We have invented a kind of acousto-optic driver based on Direct Digital synthetic technology (DDS), mainly are made up of with amplifier frequency synthesizer, logic controller, reference clock, radio frequency control.Its advantage is that output frequency is more accurate, and is stable, the resolution height, and frequency inverted speed is fast; Digital control, do not need to add aanalogvoltage, flexible and convenient to use, be convenient to digital industrial control equipment collaborative work; Adopt large scale integrated circuit, the reliability height, upgrading is convenient.Very suitable industry, scientific research are used.
Summary of the invention
The purpose of this invention is to provide a kind of acousto-optic driver, be used for replacing traditional voltage controlled oscillator acousto-optic driver based on Direct Digital synthetic technology (DDS).It is characterized in that using the synthetic frequency synthesis technique of Direct Digital.
Acousto-optic driver based on synthetic (DDS) technology of Direct Digital provided by the present invention, be made of with power management module with amplifier frequency synthesizer, logic controller, reference clock, radio frequency control: described logic controller is connected with frequency synthesizer, SCM Based logic controller, accept the digital controlled signal of operating key and programmable digital control port input, under the control of logic controller, the waveform of frequency synthesizer output frequency and amplitude provides the LCDs display working condition; Described reference clock is connected with frequency synthesizer, provides reference clock signal to frequency synthesizer; Described radio frequency control is connected with frequency synthesizer with amplifier, and the high-frequency signal that frequency synthesizer produced is amplified in advance, exports after the control of filtering, amplitude, final stage power amplification; Described power management module is connected to each unit component with power supply.
Frequency synthesizer of the present invention adopts special-purpose DDS chip, under the control of logic controller, exports the required frequency and the waveform of amplitude.Frequency synthesizer calculates the frequency number that transmits from logic controller, calculates the phase place that each clock cycle need increase, and calculates the phase place that the next clock cycle need export by phase-accumulated again.Phase place-amplitude relation function by being stored in chip internal then calculates the amplitude that this moment should export, through low pass filter smoothing processing, the i.e. waveform of the frequency of exportable needs and amplitude.
Logic controller of the present invention, adopt general single-chip microcomputer as the control core, be connected the output frequency of control frequency synthesizer and amplitude with operating key, LCDs, programmable digital control port, outside generic serial port, online programming interface; Accept the digital controlled signal of extraneous operating key and programmable digital control port input, provide LCDs to show the work at present state; Programmable digital control port and outside generic serial port are convenient to use with industrial computer is collaborative; Possess the online programming function, have extremely strong scalability and elasticity.Have special memory body chip and monitoring chip simultaneously, when abnormal power-down taking place or crash, the work at present state memorization is got off, after starting, automatically restore to original operating state next time.
Reference clock of the present invention provides reference clock signal to frequency synthesizer for producing the unit of reference clock signal.Can use common quartz oscillator to use for low cost.When being used as precision applications, also can use high-grade frequency sources such as atomic clock, accurate, stable advantage that can give full play to output frequency of the present invention this moment.
Radio frequency control of the present invention is amplified in advance with the waveform of amplifier with frequency synthesizer output, filtering, and the driving acousto-optical device is exported in amplitude control and final stage power amplification then, and the function of analog amplitude modulation is provided.
Power management module of the present invention carries out rectification with the power supply in the external world, offers other each unit components.
The mechanism of DDS acousto-optic driver provided by the present invention is: directly use the directly synthetic required frequency of digital mode and the waveform of amplitude.Frequency synthesizer calculates the frequency number that transmits from logic controller, calculates the phase place that each clock cycle need increase, and calculates the phase place that the next clock cycle need export by phase-accumulated again.Phase place-amplitude relation function by being stored in chip internal then calculates the amplitude that this moment should export, through low pass filter smoothing processing, the i.e. waveform of the frequency of exportable needs and amplitude.Then this waveform is amplified, span of control limit of control, output removes to drive acousto-optical device.This invention has improved the frequency accuracy of output drive signal, stability and resolution, and make that the driving signal frequency conversion speed is fast; Digital control, do not need to add aanalogvoltage, flexible and convenient to use, be convenient to digital industrial control equipment collaborative work; Adopt large scale integrated circuit, the reliability height, upgrading is convenient.Very suitable industry, scientific research are used.
The driving bandwidth of DDS acousto-optic driver provided by the present invention, output up to 160MHz, is applicable to high frequency, radio-frequency range, various acousto-optical devices and ultrasonic device from direct current.Frequency accuracy, resolution are all very high, all can reach 1Hz.Frequency stability is good, and Allan variance reaches 10 under the situation of using atomic clock
-11Frequency inverted speed is fast, is the microsecond level.The wave distortion distortion is little, and the spectral purity height, spuiously is lower than-20dB harmonic wave.Control flexiblely, have short and sweet human-computer interaction interface and perfect control port.The whole large scale integrated circuit that adopts, modularized design, reliability height, upgrading, easy to maintenance.Comprise online programming (ISP) function, the user can realize software upgrading easily, and can develop the Control Software that is applicable to various application easily.
Description of drawings:
Accompanying drawing 1 is a DDS acousto-optic driver structure annexation schematic diagram
Accompanying drawing 2 is logic controller structure and annexation schematic diagram
Output waveform and the frequency spectrum of accompanying drawing 3DDS acousto-optic driver when 80MHz and 60MHz
Among the figure: 1-frequency synthesizer, 2-logic controller, 3-reference clock, the control of 4-radio frequency and amplifier, 5-power management module, 6-single-chip microcomputer, 7-memory body, the 8-monitoring chip, the 9-operating key, the 10-LCDs, the input of 11-programmable digital control port, the outside generic serial port of 12-, 13-online programming interface
Embodiment
Embodiment 1:
Referring to accompanying drawing 1, frequency synthesizer 1 is by the waveform of synthetic required frequency of DDS technology Direct Digital and amplitude.Adopt special-purpose DDS chip AD9951.This chip is an ADI company product, the encapsulation of 48 pin TQFP pasters, the highest 400MHz of internal clocking frequency, integrated 14 figure place weighted-voltage D/A converters, 32 bit frequency words, the serial line interface of 25M, 1.8V power supply.Its 2 line serial line interface is connected with logic controller 2; Simulation 1.8V power supply, digital 1.8V power supply, input and output 3.3V power supply, 3 road power supplys are connected to power management module 5 respectively; The clock input pin is connected to reference clock 3, by the phase-locked internal clocking that obtains 400MHz that changes in inside; Resetting pin is connected to a RC oscillating circuit and starts shooting and reset; , required waveform is exported by output pin, transfers to radio frequency control and amplifier 4 by microstrip line.
Described logic controller 2, referring to accompanying drawing 2, by single-chip microcomputer 6, memory body 7, monitoring chip 8, operating key 9, LCDs 10, programmable digital control port input 11, outside generic serial port 12, online programming interface 13 constitutes.Single-chip microcomputer 6 is selected general single chip AT89S52 for use, is produced by Atmel company, adopts 0.18 micron system, maximum clock frequency 33MHz; Include 4 serial line interfaces, 2 interrupt interfaces and 2 timers are supported online programing function.Memory body 7, Atmel 24C16A is connected with single-chip microcomputer 6, when the DDS acousto-optic driver shuts down or the abnormity of power supply power down occurs, this chip can be stored current running parameter, make that the DDS acousto-optic driver is restarted after, return to the state of last operate as normal; Monitoring chip 8, MAX708 is connected with single-chip microcomputer 6, and auto-reset function and supply voltage monitoring function are provided; Operating key 9 on the panel is connected with single-chip microcomputer 6; 1602 type LCDs 10 are connected with single-chip microcomputer 6, show the work at present state; Programmable digital control port input 11 is connected with single-chip microcomputer 6, is used for controlling automatically the DDS acousto-optic driver; Outside generic serial port 12 is connected with single-chip microcomputer 6, is used for computer and the communication of DDS acousto-optic driver and synchronous; Online programming interface 13 is connected with single-chip microcomputer 6, is used for the software of online upgrading DDS acousto-optic driver.
Described reference clock 3 provides reference clock signal to frequency synthesizer 1 for producing the unit of reference clock signal, adopts the 100MHz quartz oscillator, and frequency stability is 10-6.
Radio frequency control of the present invention is amplified in advance with the sine wave of amplifier 4 with frequency synthesizer 1 output, filtering, and amplitude control and final stage power amplification, output drives acousto-optical device, and the function of analog amplitude modulation is provided.The pre-amplification used AG402, and the LC filter circuit low-pass filtering of cut-off frequency 160MHz is used in output, enters attenuator PAS-3 and controls as amplitude, exports CA2833 at last to and carries out the final stage power amplification, the radio-frequency (RF) output end of plate output from behind.
Described power management module 5 provides the driving power of each unit component.1.8V and 3.3V exports frequency synthesizer 1 and reference clock 3 to; 5V exports logic controller 2 to; 9V and 24V export radio frequency control and amplifier 4 to.
All radiofrequency signals are used coaxial cable or the microstrip line transmission of 1.5mm, and low frequency signal uses winding displacement to connect.Shell uses aluminum alloy materials, output waveform and the frequency spectrum of DDS acousto-optic driver when 80MHz and 60MHz, as shown in Figure 3.
Claims (6)
1. acousto-optic driver based on the Direct Digital synthetic technology, by frequency synthesizer (1), logic controller (2), reference clock (3), radio frequency control constitutes with amplifier (4) and power management module (5), it is characterized in that: described logic controller (2) is connected with frequency synthesizer (1), the single-chip microcomputer (6) of logic-based controller (2), accept the digital controlled signal of operating key and programmable digital control port input, under the control of logic controller (2), the waveform of frequency synthesizer (1) output frequency and amplitude provides the LCDs display working condition; Described reference clock (3) is connected with frequency synthesizer (1), provides reference clock signal to frequency synthesizer (1); The control of described radio frequency is connected with frequency synthesizer (1) with amplifier (4), and the high-frequency signal that frequency synthesizer (1) is produced amplifies in advance, filtering, amplitude are controlled, the final stage power amplification; Described power management module (5) is connected to each unit component with power supply.
2. according to the described acousto-optic driver of claim 1 based on the Direct Digital synthetic technology, it is characterized in that: frequency synthesizer (1) adopts special-purpose DDS chip, under the control of logic controller (2), export the required frequency and the waveform of amplitude, frequency synthesizer (1) calculates the frequency number that transmits from logic controller (2), calculate the phase place that each clock cycle need increase, calculate the phase place that the next clock cycle need export by phase-accumulated again, phase place-amplitude relation function by being stored in chip internal then, calculate the amplitude that this moment should export, through the low pass filter smoothing processing, the frequency that output needs and the waveform of amplitude.
3. according to the described acousto-optic driver of claim 2 based on the Direct Digital synthetic technology, it is characterized in that: described special-purpose DDS chip is AD9951, the encapsulation of 48 pin TQFP pasters, the highest 400MHz of internal clocking frequency, integrated 14 figure place weighted-voltage D/A converters, 32 bit frequency words, the serial line interface of 25M, 1.8V power supply; Leg by chip constitutes 2 line serial ports and is connected with logic controller (2); Clock input pin by chip connects reference clock (3), by the phase-locked internal clocking that obtains 400MHz that changes in inside; Waveform output pin by chip connects radio frequency control and amplifier (4).
4. according to the described acousto-optic driver based on the Direct Digital synthetic technology of claim 1, it is characterized in that: described logic controller (2) is used for the output frequency and the amplitude of control frequency synthesizer (1); Logic controller (2) is made up of single-chip microcomputer (6), memory body (7), monitoring chip (8), operating key (9), LCDs (10), the input of programmable digital control port (11), outside generic serial port (12), online programming interface (13); Memory body (7), monitoring chip (8), operating key (9), LCDs (10), the input of programmable digital control port (11), outside generic serial port (12), online programming interface (13) directly are connected with single-chip microcomputer (6) respectively.
5. according to the described acousto-optic driver based on the Direct Digital synthetic technology of claim 4, it is characterized in that: single-chip microcomputer (6) is selected general single chip AT89S52 for use, is produced by Atmel company, adopts 0.18 micron system, maximum clock frequency 33MHz; Include 4 serial line interfaces, 2 interrupt interfaces and 2 timers are supported online programing function; Memory body (7) is selected Atmel 24C16A for use, be connected with single-chip microcomputer (6), when the DDS acousto-optic driver shut down or the abnormity of power supply power down occurs, this chip can be stored current running parameter, after making that the DDS acousto-optic driver is restarted, return to the state of last operate as normal; Monitoring chip (8) is selected MAX708 for use, is connected with single-chip microcomputer (6), and auto-reset function and supply voltage monitoring function are provided; Operating key on the panel (9) is connected with single-chip microcomputer (6); 1602 type LCDs (10) are connected with single-chip microcomputer (6), show the work at present state; Programmable digital control port input (11) is connected with single-chip microcomputer (6), is used for controlling automatically the DDS acousto-optic driver; Outside generic serial port (12) is connected with single-chip microcomputer (6), is used for computer and the communication of DDS acousto-optic driver and synchronous; Online programming interface (13) is connected with single-chip microcomputer (6), is used for the software of online upgrading DDS acousto-optic driver.
6. according to the described acousto-optic driver based on the Direct Digital synthetic technology of claim 1, it is characterized in that: reference clock (3) is quartz oscillator or atomic clock.
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| CN2008101206133A CN101350619B (en) | 2008-08-26 | 2008-08-26 | Acousto-optic driver base on direct digital synthesis technology |
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| CN2008101206133A CN101350619B (en) | 2008-08-26 | 2008-08-26 | Acousto-optic driver base on direct digital synthesis technology |
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Cited By (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103080820A (en) * | 2010-06-09 | 2013-05-01 | 徕卡显微系统复合显微镜有限公司 | Acousto-optical system, microscope and method of use of the acousto-optical system |
| CN104639160A (en) * | 2013-11-13 | 2015-05-20 | 上海联影医疗科技有限公司 | Digital control oscillator and magnetic resonance imaging system |
| CN110764287A (en) * | 2019-11-19 | 2020-02-07 | 中国船舶重工集团公司第七0七研究所 | Acousto-optic frequency shifter driving circuit |
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2008
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Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103080820A (en) * | 2010-06-09 | 2013-05-01 | 徕卡显微系统复合显微镜有限公司 | Acousto-optical system, microscope and method of use of the acousto-optical system |
| CN103080820B (en) * | 2010-06-09 | 2016-06-22 | 徕卡显微系统复合显微镜有限公司 | Acousto-optic system and use microscope and the method for this acousto-optic system |
| EP2580618B1 (en) * | 2010-06-09 | 2019-02-27 | Leica Microsystems CMS GmbH | Acousto-optical system, microscope and method of use of the acousto-optical system |
| CN104639160A (en) * | 2013-11-13 | 2015-05-20 | 上海联影医疗科技有限公司 | Digital control oscillator and magnetic resonance imaging system |
| CN110764287A (en) * | 2019-11-19 | 2020-02-07 | 中国船舶重工集团公司第七0七研究所 | Acousto-optic frequency shifter driving circuit |
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