CN110764287B - Acousto-optic frequency shifter driving circuit - Google Patents
Acousto-optic frequency shifter driving circuit Download PDFInfo
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- CN110764287B CN110764287B CN201911131990.1A CN201911131990A CN110764287B CN 110764287 B CN110764287 B CN 110764287B CN 201911131990 A CN201911131990 A CN 201911131990A CN 110764287 B CN110764287 B CN 110764287B
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- G—PHYSICS
- G02—OPTICS
- G02F—OPTICAL DEVICES OR ARRANGEMENTS FOR THE CONTROL OF LIGHT BY MODIFICATION OF THE OPTICAL PROPERTIES OF THE MEDIA OF THE ELEMENTS INVOLVED THEREIN; NON-LINEAR OPTICS; FREQUENCY-CHANGING OF LIGHT; OPTICAL LOGIC ELEMENTS; OPTICAL ANALOGUE/DIGITAL CONVERTERS
- G02F1/00—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics
- G02F1/01—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour
- G02F1/11—Devices or arrangements for the control of the intensity, colour, phase, polarisation or direction of light arriving from an independent light source, e.g. switching, gating or modulating; Non-linear optics for the control of the intensity, phase, polarisation or colour based on acousto-optical elements, e.g. using variable diffraction by sound or like mechanical waves
- G02F1/113—Circuit or control arrangements
Abstract
The invention discloses a driving circuit of an acousto-optic frequency shifter, which belongs to the technical field of acousto-optic frequency shifters and is characterized by comprising a direct digital frequency synthesizer, a high-linearity analog variable gain amplifier, a radio frequency control switch and a control core chip, wherein the direct digital frequency synthesizer is used for generating a direct digital frequency signal; the control core chip is connected with the communication end and the control end of the two direct digital frequency synthesizers, the output ends of the two direct digital frequency synthesizers are respectively connected with the input ends of the two high-linearity analog variable gain amplifiers, the output ends of the two high-linearity analog variable gain amplifiers are respectively connected with the input end of the radio frequency control switch, the output end of the radio frequency control switch is connected with the input end of the radio frequency control switch, and the output ends of the two radio frequency control switches are connected with the power amplification module. The invention controls the frequency, amplitude, phase, switch and slope output of the output signal by various means, not only has small frequency output noise, but also has adjustable power, controllable on-off and flexible and convenient use.
Description
Technical Field
The invention belongs to the technical field of acousto-optic frequency shifters, and particularly relates to a driving circuit of an acousto-optic frequency shifter.
Background
An Acousto-Optic frequency shifter (AOM) is an Acousto-Optic device for changing the frequency of a light beam, and mainly comprises an Acousto-Optic medium and a piezoelectric transducer. Three important technical indicators of an acousto-optic frequency shifter are center frequency, modulation bandwidth and diffraction efficiency. AOMs typically operate in the range of 40MHz to several hundred MHz, with diffraction efficiencies typically above 80%. Within the working range of the AOM, the center frequency and the diffraction efficiency of the AOM are controllable, and only a matched radio frequency driving source needs to be controlled to output the required frequency.
One of the functions of the driving circuit of the acousto-optic frequency shifter (AOM) is to provide a matched radio frequency driving source for the AOM, and a Direct Digital Synthesizer (DDS) is used here. An acousto-optic frequency shifter (AOM) driving circuit changes the frequency shifting frequency and the diffraction direction of the AOM by adjusting the frequency of the DDS; by increasing the output power of the DDS, the diffraction efficiency of the AOM is increased, thereby increasing the power of the output laser.
The acousto-optic frequency shifter (AOM) driving circuit is also used as an optical switch, the signal output of the DDS is accurately controlled through the radio frequency control switch, the on-off of the laser can be controlled, and the speed of the switch can be tens of ns to tens of ns.
However, the existing acousto-optic frequency shifter (AOM) driving circuit is single in function, low in integration level and inconvenient to use.
Disclosure of Invention
The invention provides a driving circuit of an acousto-optic frequency shifter, which can integrate two paths of AOM driving sources (DDS signals) capable of independently controlling the on-off and the radio frequency power; respectively controlling the on-off of the two DDS signals through the two TTL level signals; the power output of the two DDS signals is respectively adjusted through two input (0-5) V voltages; two DDS signals are controlled to hop frequency and sweep frequency within a given range of an upper computer through an RS-422 serial port to be output; and a series of functions of frequency hopping, frequency sweeping output and the like of the two DDS signals within a specific range are controlled by the two TTL level signals.
The invention aims to provide an acousto-optic frequency shifter driving circuit, which comprises a direct digital frequency synthesizer, a high-linearity analog variable gain amplifier, a radio frequency control switch and a control core chip, wherein the direct digital frequency synthesizer is connected with the high-linearity analog variable gain amplifier; the control core chip is connected with the communication ends and the control ends of the two direct digital frequency synthesizers, the output ends of the two direct digital frequency synthesizers are respectively connected with the input ends of the two high-linearity analog variable gain amplifiers after passing through the two low-pass filters, the output ends of the two high-linearity analog variable gain amplifiers are respectively connected with the input ends of the two first radio frequency control switches, the output ends of the two first radio frequency control switches are connected with the input ends of the two second radio frequency control switches, the output ends of the two second radio frequency control switches are connected with the two power amplification modules, and the output ends of the two power amplification modules are connected with the two loads;
the direct digital frequency synthesizer generates a sine waveform with the highest 400MHz, controls the signal frequency, the phase and the amplitude of the direct digital frequency synthesizer, and realizes frequency sweeping action by utilizing a digital slope modulation mode of the direct digital frequency synthesizer;
two paths of 0-5V input voltages are applied to the control end of the high-linearity analog variable gain amplifier, and the signal power output of the two paths of direct digital frequency synthesizers is adjusted;
the radio frequency control switch comprises a radio frequency control switch I and a radio frequency control switch II which are connected in series;
the control core chip controls the single frequency, phase and amplitude output of the direct digital frequency synthesizer;
the control core chip is communicated with an upper computer through an RS-422 serial port and controls frequency hopping and frequency sweeping output of signals of the two paths of direct digital frequency synthesizers within a certain range;
the two TTL level signals trigger an interrupt program of a control core chip to control the frequency hopping and frequency sweeping output of the signals of the two direct digital frequency synthesizers within a certain range.
Further, the direct digital frequency synthesizer has a model number of AD9910.
Further, the model of the high linearity analog variable gain amplifier is MAX2090.
Further, the model of the radio frequency control switch is HMC349MS8G.
Furthermore, the model of the control core chip is TM4C123GH6PZ.
The invention has the advantages and positive effects that:
by adopting the technical scheme, the invention integrates two paths of AOM driving sources (DDS signals) which can independently control the on-off and the radio frequency power; respectively controlling the on-off of the two DDS signals through the two TTL level signals; the power output of the two DDS signals is respectively adjusted through two input (0-5) V voltages; controlling two DDS signals to frequency hop and sweep frequency output within a given range of an upper computer through an RS-422 serial port; and a series of functions of frequency hopping, frequency sweeping output and the like of the two DDS signals within a specific range are controlled by the two TTL level signals.
The invention can integrate two paths of acousto-optic frequency shifter (AOM) driving circuits on a single board, can control the frequency, amplitude, phase, switch, slope output and other functions of output signals by various means, has smaller frequency output noise, adjustable power, controllable on-off and flexible and convenient use.
Drawings
Fig. 1 is a schematic block circuit diagram of a preferred embodiment of the present invention.
Fig. 2 is a schematic diagram of a direct digital frequency synthesizer (DDS) AD9910 in a preferred embodiment of the invention.
Fig. 3 is a schematic diagram of a high linearity analog variable gain amplifier MAX2090 in a preferred embodiment of the invention.
Fig. 4 is a schematic diagram of a radio frequency control switch module in a preferred embodiment of the invention.
FIG. 5 is a schematic diagram of an ARM chip TM4C123GH6PZ according to a preferred embodiment of the present invention.
Detailed Description
In order to further understand the contents, features and effects of the present invention, the following embodiments are illustrated and described in detail with reference to the accompanying drawings:
referring to fig. 1 to 5, an acousto-optic frequency shifter driving circuit includes a direct digital frequency synthesizer DDS (AD 9910), a high linearity analog variable gain amplifier MAX2090, a radio frequency control switch HMC349MS8G, and a control core chip ARM (TM 4C123GH6 PZ). The system comprises a control core chip ARM (TM 4C123GH6 PZ) and two DDS chips AD9910, wherein the communication and control ends of the two DDS chips AD9910 are connected with the output ends of the two DDS chips AD9910 respectively, the input ends of two high-linearity analog variable gain amplifiers MAX2090 are connected with the output ends of the two high-linearity analog variable gain amplifiers MAX2090 respectively, the input ends of a radio frequency control switch HMC349MS8G are connected with the output end of the radio frequency control switch HMC349MS8G, and the output ends of the two radio frequency control switches HMC349MS8G are connected with a power amplification module.
FIG. 2 shows the peripheral pin connection of a direct digital frequency synthesizer (DDS) AD9910, and the reference clock input end adopts a direct drive mode of a single-ended signal source; the built-in 14-bit DAC outputs two paths of currents, so that common mode noise can be reduced; the specific control pin is connected with the I/O pin of the control core ARM chip TM4C123GH6PZ, and the connection is isolated by a resistor bank.
FIG. 3 is a circuit diagram of a high linearity analog variable gain amplifier MAX2090, where the CTRL1 and CTRL2 terminals are operation mode control terminals, where CTRL1 is "high" and CTRL2 is "low", and a VGA (variable gain amplification) mode is selected; the PLVLSET terminal is connected to an external analog control voltage to control the gain of MAX2090.
Fig. 4 is a schematic diagram of two serial connections of the HMC349MS8G, which can ensure that no leakage signal passes through when the signal is turned off. Changing the "high" and "low" levels of the input signal RF-SWITCH1 can control the on/off of the output terminal OUT 1.
FIG. 5 is a schematic diagram of the control core ARM chip TM4C123GH6PZ, which marks all I/O pins required to be connected with two DDS chip AD9910 control pins; a crystal is used to provide the chip clock frequency.
The working principle of the invention is as follows:
1. constant frequency output function, controllable on-off and adjustable power
The constant frequency output function is to control the AOM drive circuit to be in a working state all the time and output a single frequency signal. The DDS chip AD9910 has a single-frequency modulation mode, and a single frequency can be simply output in the mode. In the TM4C123GH6PZ program, any one of 8 Profile registers of AD9910 may be selected as a register of DDS signal control parameters, the TM4C123GH6PZ directly writes the signal control parameters into the AD9910 signal control parameter register according to the address through the serial I/O port, and the AD9910 is saved one by one according to the register address, and finally outputs the given frequency. The on-off of the DDS output signal can be controlled by changing the high level and the low level of the TTL signal RF-SWITCH1, and the magnitude of the DDS output signal can be controlled by changing the external analog control voltage connected with the PLVLSI terminal.
The RS-422 serial port controls frequency hopping and frequency sweeping output of two DDS signals within a certain range, and the on-off is controllable, and the power is adjustable
Frequency hopping and frequency sweeping output of two DDS signals within a certain range are controlled through an RS-422 serial port, and the frequency can be set by an upper computer. When TM4C123GH6PZ initializes, write the initial signal control parameter into AD9910 signal control parameter register according to the address through serial I/O port, directly output the initialization frequency. Establishing TM4C123GH6PZ and RS-422 serial port communication of an upper computer, and ensuring real-time performance; secondly, once data transmission is carried out on the serial port, the serial port communication interruption is immediately carried out, serial port communication information is processed, and initial signal control parameters, frequency hopping and frequency sweeping target signal control parameters are separated; thirdly, a timer is added to control the delayed output of the output signal, and if the delay is not needed, the program can skip the delayed output; and finally, the TM4C123GH6PZ writes the signal control parameters into an AD9910 signal control parameter register according to addresses through a serial I/O port, the AD9910 is stored one by one according to the register addresses, frequency hopping directly outputs given frequency, and frequency sweeping is to execute digital ramp modulation mode output frequency.
After frequency hopping and frequency sweeping are finished, if the output frequency jumps to the initial frequency, a timer needs to be added, the timer controls the duration time of the target frequency, after the timer reaches the preset time, the timer is started to interrupt, TM4C123GH6PZ writes the initial frequency control parameter into an AD9910 signal control parameter register according to the address through a serial I/O port, and the given initial frequency is output.
The on-off of the DDS output signal can be controlled by changing the high and low levels of the TTL signal RF-SWITCH1, and the size of the DDS output signal can be controlled by changing the external analog control voltage connected with the PLVLSI terminal.
3. Two TTL level signals control frequency hopping and frequency sweeping output of two DDS signals within a certain range, the on-off is controllable, and the power is adjustable
And controlling frequency hopping and frequency sweeping output of the two DDS signals within a certain range by the two TTL level signals, wherein the information such as the initial frequency, the target frequency and the like is solidified. Firstly, TM4C123GH6PZ writes an initial signal control parameter into an AD9910 signal control parameter register according to an address through a serial I/O port, and outputs a given initial frequency; secondly, monitoring two paths of TTL level signals by TM4C123GH6PZ, entering a corresponding I/O port for interruption after detecting a rising edge, writing target signal control parameters into an AD9910 signal control parameter register according to addresses through a serial I/O port, directly outputting given frequency by frequency hopping, and outputting the frequency by executing a digital ramp modulation mode when frequency sweeping is carried out; thirdly, adding and starting a timer to control the duration of the target output signal; and finally, entering timer interruption, and writing the initial signal control parameter into an AD9910 signal control parameter register according to the address by the TM4C123GH6PZ through the serial I/O port to output a given initial frequency.
The on-off of the DDS output signal can be controlled by changing the high and low levels of the TTL signal RF-SWITCH1, and the size of the DDS output signal can be controlled by changing the external analog control voltage connected with the PLVLSI terminal.
The above description is only for the preferred embodiment of the present invention, and is not intended to limit the present invention in any way, and all simple modifications, equivalent changes and modifications made to the above embodiment according to the technical spirit of the present invention are within the scope of the technical solution of the present invention.
Claims (2)
1. A driving circuit of an acousto-optic frequency shifter is characterized in that two DDS signals which independently control the on-off and the radio frequency power are integrated; respectively controlling the on-off of the two DDS signals through the two TTL level signals; the power output of the two DDS signals is respectively adjusted by two paths of input 0-5V voltages; controlling two DDS signals to frequency hop and sweep frequency output within a given range of an upper computer through an RS-422 serial port; controlling frequency hopping and frequency sweeping output of the two DDS signals within a specific range through the two TTL level signals; the high-linearity analog variable gain amplifier comprises a direct digital frequency synthesizer, a high-linearity analog variable gain amplifier, a radio frequency control switch and a control core chip; the control core chip is connected with the communication ends and the control ends of the two direct digital frequency synthesizers, the output ends of the two direct digital frequency synthesizers are respectively connected with the input ends of the two high-linearity analog variable gain amplifiers after passing through the two low-pass filters, the output ends of the two high-linearity analog variable gain amplifiers are respectively connected with the input ends of the two radio frequency control switches I, the output ends of the two radio frequency control switches I are connected with the input ends of the two radio frequency control switches II, the output ends of the two radio frequency control switches II are connected with the two power amplification modules, and the output ends of the two power amplification modules are connected with the two loads; the model of the direct digital frequency synthesizer is AD9910; the model of the high-linearity analog variable gain amplifier is MAX2090; the model of the control core chip is TM4C123GH6PZ;
the direct digital frequency synthesizer generates a sine waveform with the highest 400MHz, controls the signal frequency, the phase and the amplitude of the direct digital frequency synthesizer, and realizes the frequency sweeping action by utilizing a digital slope modulation mode of the direct digital frequency synthesizer;
two paths of 0-5V input voltages are applied to the control end of the high-linearity analog variable gain amplifier, and the signal power output of the two paths of direct digital frequency synthesizers is adjusted;
the radio frequency control switch comprises a first radio frequency control switch and a second radio frequency control switch which are connected in series;
the control core chip controls the single frequency, phase and amplitude output of the direct digital frequency synthesizer;
the control core chip is communicated with an upper computer through an RS-422 serial port and controls frequency hopping and frequency sweeping output of signals of the two paths of direct digital frequency synthesizers within a certain range;
the two TTL level signals trigger an interrupt program of a control core chip to control frequency hopping and frequency sweeping output of the two signals of the direct digital frequency synthesizer within a certain range; the method specifically comprises the following steps: firstly, TM4C123GH6PZ writes initial signal control parameters into an AD9910 signal control parameter register according to addresses through a serial I/O port, and outputs given initial frequency; secondly, monitoring two paths of TTL level signals by TM4C123GH6PZ, entering a corresponding I/O port for interruption after detecting a rising edge, writing target signal control parameters into an AD9910 signal control parameter register according to addresses through a serial I/O port, directly outputting given frequency by frequency hopping, and outputting the frequency by executing a digital ramp modulation mode when frequency sweeping is carried out; thirdly, adding and starting a timer to control the duration of the target output signal; and finally, entering timer interruption, and writing the initial signal control parameter into an AD9910 signal control parameter register according to the address by the TM4C123GH6PZ through the serial I/O port to output a given initial frequency.
2. The acousto-optic frequency shifter driver circuit of claim 1 wherein the rf control switch is of the type HMC349MS8G.
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| CN112230450B (en) * | 2020-11-06 | 2024-04-23 | 苏州贝林激光有限公司 | AOM control system and control method thereof |
| CN112230451B (en) * | 2020-11-06 | 2023-10-10 | 苏州贝林激光有限公司 | Control circuit of double-path acousto-optic modulator and control method thereof |
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| US7538929B2 (en) * | 2007-04-06 | 2009-05-26 | Harris Corporation | RF phase modulation technique for performing acousto-optic intensity modulation of an optical wavefront |
| CN101350619B (en) * | 2008-08-26 | 2011-03-16 | 浙江大学 | Acousto-optic driver base on direct digital synthesis technology |
| CN101674080B (en) * | 2009-09-28 | 2012-07-18 | 中国电子科技集团公司第四十一研究所 | Dual-path agility signal-generating method capable of adjusting phase differences |
| CN106200029A (en) * | 2016-09-12 | 2016-12-07 | 中国科学技术大学 | A kind of acousto-optic modulator drive circuit and scan method thereof |
| CN109391266A (en) * | 2018-12-28 | 2019-02-26 | 陕西烽火电子股份有限公司 | A kind of hybrid frequency synthesizer based on orthogonal modulation |
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