CN209896433U - Butterfly laser drive circuit - Google Patents
Butterfly laser drive circuit Download PDFInfo
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- CN209896433U CN209896433U CN201921181970.0U CN201921181970U CN209896433U CN 209896433 U CN209896433 U CN 209896433U CN 201921181970 U CN201921181970 U CN 201921181970U CN 209896433 U CN209896433 U CN 209896433U
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 17
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- 238000003786 synthesis reaction Methods 0.000 claims abstract description 13
- 230000002194 synthesizing effect Effects 0.000 claims description 5
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Abstract
The utility model discloses a butterfly laser drive circuit, including digital analog conversion circuit, frequency synthesis circuit and adder circuit, digital analog conversion circuit's output and frequency synthesis circuit's output are as adder circuit's input, adder circuit's output is used for driving butterfly laser; the frequency synthesis circuit comprises a clock circuit, a frequency synthesizer and an output circuit; the clock circuit comprises a crystal oscillator X2, wherein a VCC (voltage to continuity) pin of the crystal oscillator X2 is connected to VCC through an inductor L9, a VCC pin of the crystal oscillator X2 is grounded through a capacitor C64, an output pin of the crystal oscillator X2 is connected to a clock end of the frequency synthesizer through a resistor R75, and an output pin of the crystal oscillator X2 is further connected to a control end through a series connection of a resistor R75 and a resistor R74; the utility model discloses a low-power consumption AD5624R digital-to-analog converter cooperation frequency synthesizer can realize butterfly laser's stable drive.
Description
Technical Field
The utility model relates to a butterfly laser technical field, concretely relates to butterfly laser drive circuit.
Background
The laser used in the TDLAS technology has very strict requirements on the wavelength of the light source, and needs to be very stable in the wavelength of the light source and can be tuned in a small range (less than 1 nm). In this process, both temperature and current have an effect on the wavelength and are therefore very important for the driving of the laser.
Therefore, it is necessary to provide a driving circuit for stably driving a laser.
SUMMERY OF THE UTILITY MODEL
In view of the above-mentioned drawbacks of the prior art, the present invention provides a driving circuit for stably driving a butterfly laser.
The purpose of the utility model is realized through such technical scheme:
a butterfly laser driving circuit comprises a digital-to-analog conversion circuit, a frequency synthesis circuit and an adder circuit, wherein the output of the digital-to-analog conversion circuit and the output of the frequency synthesis circuit are used as the input of the adder circuit, and the output of the adder circuit is used for driving a butterfly laser;
the frequency synthesis circuit comprises a clock circuit, a frequency synthesizer and an output circuit, wherein the clock circuit comprises a crystal oscillator X2, a VCC (voltage holding) pin of the crystal oscillator X2 is connected to VCC through an inductor L9, a VCC pin of the crystal oscillator X2 is grounded through a capacitor C64, an output pin of the crystal oscillator X2 is connected to a clock end of the frequency synthesizer through a resistor R75, and an output pin of the crystal oscillator X2 is further connected to a control end through a series connection of a resistor R75 and a resistor R74;
the output circuit comprises a resistor R28, resistors R76-R79, capacitors C123-C128, an inductor L7 and an inductor L11;
the first output end of the frequency synthesizer is connected to the second output end of the frequency synthesizer through the series connection of a resistor R76 and a resistor R78, the first output end of the frequency synthesizer is connected to the second output end of the frequency synthesizer through the series connection of a resistor R77 and a resistor R79, one end of a capacitor C128 is connected between a resistor R76 and a resistor R78, the other end of the capacitor C128 is connected between a resistor R77 and a resistor R79, and a resistor R77 and a resistor R79 are also connected to the analog quantity input common end of the frequency synthesizer;
the first output end of the frequency synthesizer is further connected to one ends of a capacitor C125, an inductor L7 and a capacitor C123, the other end of the capacitor C125 is connected between a resistor R77 and a resistor R79, the other end of the inductor L7 is connected to the other end of a capacitor C123, the other end of the capacitor C123 is connected to an analog input common end of the frequency synthesizer through a capacitor C126, the other end of the capacitor C123 is connected to one ends of a capacitor C124 and an inductor L11, the other end of the capacitor C124 is connected to the other end of the inductor L11, and the other end of the inductor L11 is connected to the analog input common end of the frequency synthesizer through a parallel connection of a capacitor C127 and a resistor R28;
the other end of the inductor L11 is used as the output of the frequency synthesizing circuit.
Optionally, the frequency synthesizer is an AD9850 direct frequency synthesizer.
Optionally, a VINN pin of the frequency synthesizer is further connected between the resistor R76 and the resistor R78.
Optionally, the digital-to-analog conversion circuit includes an AD5624R digital-to-analog converter, and an output of the digital-to-analog converter is used as an output of the digital-to-analog conversion circuit.
Optionally, the adder circuit includes an adder U22A;
the inverting input end of the adder is connected to the output of the frequency synthesis circuit through a resistor R80, and the inverting input end of the adder is connected to the output of the digital-to-analog conversion circuit through a resistor R82;
the inverting input end of the adder is connected to the output end of the adder through a resistor R81;
the same-direction input end of the adder is connected to the common grounding end of the driving circuit, and the output end of the adder serves as output to drive the butterfly laser.
Optionally, the common terminal of the butterfly laser is connected to the common ground terminal of the driving circuit through a resistor R95.
Due to the adoption of the technical scheme, the utility model discloses following advantage has:
in the embodiment, the stable driving of the butterfly laser can be realized by adopting the low-power AD5624R digital-to-analog converter and the frequency synthesizer.
Additional advantages, objects, and features of the invention will be set forth in part in the description which follows and in part will become apparent to those having ordinary skill in the art upon examination of the following or may be learned from practice of the invention. The objectives and other advantages of the present invention will be realized and attained by the structure particularly pointed out in the written description and claims hereof.
Drawings
The drawings of the utility model are as follows:
FIG. 1 is a schematic diagram of a digital-to-analog conversion circuit according to the present embodiment;
FIG. 2 is a schematic diagram of a clock circuit according to the present embodiment;
FIG. 3 is a schematic diagram of the circuit structure of the AD9850 direct frequency synthesizer of the present embodiment;
FIG. 4 is a circuit diagram of an output circuit of the present embodiment;
fig. 5 is a circuit diagram of the adder according to the present embodiment.
Detailed Description
The present invention will be further explained with reference to the drawings and examples.
Example (b): the present embodiment provides a butterfly laser driving circuit, which includes a digital-to-analog conversion circuit, a frequency synthesis circuit, and an adder circuit.
And the output of the digital-to-analog conversion circuit and the output of the frequency synthesis circuit are used as the input of the adder circuit, and the output of the adder circuit is used for driving the butterfly laser.
As shown in fig. 1, the digital-to-analog converter is AD5624R, and pins 1, 2, 4, and 5 of the digital-to-analog converter are used as voltage outputs;
a capacitor C32 is connected between the VDD pin of the digital-to-analog converter and the GND pin, the VDD pin of the digital-to-analog converter is connected to VCC, the VDD pin of the digital-to-analog converter is grounded through a capacitor C33, and the GND pin of the digital-to-analog converter is grounded.
AD5624R belongs to the nano DAC series, has low power consumption, four-channel, 12/14/16 bit buffer voltage output's digital-to-analog converter (DAC) respectively, adopts 2.7V to 5.5V single power supply, can guarantee the monotonicity through the design. An on-chip reference voltage source is arranged in each device, and the full-scale output range can reach 2.5V; when the power is on, the on-chip reference voltage source is closed, so that an external reference voltage can be used. All devices can be powered by a single power supply of 2.7V to 5.5V.
The frequency synthesizing circuit includes a clock circuit, a frequency synthesizer and an output circuit.
As shown in fig. 2, the clock circuit includes a crystal oscillator X2, the VCC pin of the crystal oscillator X2 is connected to VCC through an inductor L9, the VCC pin of the crystal oscillator X2 is grounded through a capacitor C64, the output pin of the crystal oscillator X2 is connected to the clock terminal of the frequency synthesizer through a resistor R75, and the output pin of the crystal oscillator X2 is further connected to the control terminal through the series connection of a resistor R75 and a resistor R74.
The output circuit comprises a resistor R28, resistors R76-R79, capacitors C123-C128, an inductor L7 and an inductor L11.
As shown in fig. 3 and 4, the first output terminal of the frequency synthesizer is connected to the second output terminal of the frequency synthesizer through the series connection of the resistor R76 and the resistor R78, the first output terminal of the frequency synthesizer is connected to the second output terminal of the frequency synthesizer through the series connection of the resistor R77 and the resistor R79, one end of the capacitor C128 is connected between the resistor R76 and the resistor R78, the other end of the capacitor C128 is connected between the resistor R77 and the resistor R79, and the resistor R77 and the resistor R79 are further connected to the analog input common terminal of the frequency synthesizer;
the first output end of the frequency synthesizer is further connected to one ends of a capacitor C125, an inductor L7 and a capacitor C123, the other end of the capacitor C125 is connected between a resistor R77 and a resistor R79, the other end of the inductor L7 is connected to the other end of a capacitor C123, the other end of the capacitor C123 is connected to an analog input common end of the frequency synthesizer through a capacitor C126, the other end of the capacitor C123 is connected to one ends of a capacitor C124 and an inductor L11, the other end of the capacitor C124 is connected to the other end of the inductor L11, and the other end of the inductor L11 is connected to the analog input common end of the frequency synthesizer through a parallel connection of a capacitor C127 and a resistor R28;
the other end of the inductor L11 is used as the output of the frequency synthesizing circuit.
Optionally, the frequency synthesizer is an AD9850 direct frequency synthesizer.
Optionally, a VINN pin of the frequency synthesizer is further connected between the resistor R76 and the resistor R78.
Optionally, the digital-to-analog conversion circuit includes an AD5624R digital-to-analog converter, and an output of the digital-to-analog converter is used as an output of the digital-to-analog conversion circuit.
Taking the sine wave signal as 20KHz and the DA resolution as 16 bits as an example, the DA conversion rate f needs to reach 1.28 ghz under the condition of complete interpolation. Since this high conversion rate is not accomplished by ordinary DA, and requires the use of a dedicated DA or dds chip, the AD9850 is selected in this embodiment to generate a spectrally clean analog output sine wave with programmable frequency and phase.
The sine wave can be used directly as a frequency source or converted to a square wave suitable for application by a agile clock generator. The AD9850 also incorporates a high speed comparator configured to accept the (externally) filtered output of the DAC to produce a spread low jitter square wave output so that the device can be used as a agile clock generator.
Optionally, as shown in fig. 5, the adder circuit includes an adder U22A;
the inverting input terminal of the adder is connected to the output of the frequency synthesizing circuit through a resistor R80, the inverting input terminal of the adder is connected to the output of the digital-to-analog converting circuit through a resistor R82,
the inverting input end of the adder is connected to the output end of the adder through a resistor R81;
the same-direction input end of the adder is connected to the common grounding end of the driving circuit, and the output end of the adder serves as output to drive the butterfly laser.
Optionally, the common terminal of the butterfly laser is connected to the common ground terminal of the driving circuit through a resistor R95.
Therefore, digital signals generated by the DA and the DDS are added together after passing through the adder, and then are transmitted to the next stage as a driving source of the laser, so that the stable driving of the butterfly laser is realized.
Finally, the above embodiments are only used for illustrating the technical solutions of the present invention and not for limiting, and although the present invention has been described in detail with reference to the preferred embodiments, it should be understood by those skilled in the art that modifications or equivalent substitutions may be made to the technical solutions of the present invention without departing from the spirit and scope of the technical solutions, and all of them should be covered by the scope of the claims of the present invention.
Claims (6)
1. A butterfly laser driving circuit is characterized by comprising a digital-to-analog conversion circuit, a frequency synthesis circuit and an adder circuit, wherein the output of the digital-to-analog conversion circuit and the output of the frequency synthesis circuit are used as the input of the adder circuit, and the output of the adder circuit is used for driving a butterfly laser;
the frequency synthesis circuit comprises a clock circuit, a frequency synthesizer and an output circuit;
the clock circuit comprises a crystal oscillator X2, wherein a VCC (voltage to continuity) pin of the crystal oscillator X2 is connected to VCC through an inductor L9, a VCC pin of the crystal oscillator X2 is grounded through a capacitor C64, an output pin of the crystal oscillator X2 is connected to a clock end of the frequency synthesizer through a resistor R75, and an output pin of the crystal oscillator X2 is further connected to a control end through a series connection of a resistor R75 and a resistor R74;
the output circuit comprises a resistor R28, resistors R76-R79, capacitors C123-C128, an inductor L7 and an inductor L11;
the first output end of the frequency synthesizer is connected to the second output end of the frequency synthesizer through the series connection of a resistor R76 and a resistor R78, the first output end of the frequency synthesizer is connected to the second output end of the frequency synthesizer through the series connection of a resistor R77 and a resistor R79, one end of a capacitor C128 is connected between a resistor R76 and a resistor R78, the other end of the capacitor C128 is connected between a resistor R77 and a resistor R79, and a resistor R77 and a resistor R79 are also connected to the analog quantity input common end of the frequency synthesizer;
the first output end of the frequency synthesizer is further connected to one ends of a capacitor C125, an inductor L7 and a capacitor C123, the other end of the capacitor C125 is connected between a resistor R77 and a resistor R79, the other end of the inductor L7 is connected to the other end of a capacitor C123, the other end of the capacitor C123 is connected to an analog input common end of the frequency synthesizer through a capacitor C126, the other end of the capacitor C123 is connected to one ends of a capacitor C124 and an inductor L11, the other end of the capacitor C124 is connected to the other end of the inductor L11, and the other end of the inductor L11 is connected to the analog input common end of the frequency synthesizer through a parallel connection of a capacitor C127 and a resistor R28;
the other end of the inductor L11 is used as the output of the frequency synthesizing circuit.
2. The butterfly laser driver circuit of claim 1, wherein the frequency synthesizer is an AD9850 direct frequency synthesizer.
3. The butterfly laser driver circuit of claim 2, wherein the resistor R76 and the resistor R78 are further connected to a VINN pin of the frequency synthesizer.
4. The butterfly laser driver circuit of claim 1, wherein the digital-to-analog converter circuit comprises an AD5624R digital-to-analog converter, and an output of the digital-to-analog converter is used as an output of the digital-to-analog converter circuit.
5. The butterfly laser driver circuit of claim 4, wherein the adder circuit comprises an adder U22A;
the inverting input end of the adder is connected to the output of the frequency synthesis circuit through a resistor R80, and the inverting input end of the adder is connected to the output of the digital-to-analog conversion circuit through a resistor R82;
the inverting input end of the adder is connected to the output end of the adder through a resistor R81;
the same-direction input end of the adder is connected to the common grounding end of the driving circuit, and the output end of the adder serves as output to drive the butterfly laser.
6. The butterfly laser driver circuit of claim 5, wherein the common terminal of the butterfly laser is connected to the common ground terminal of the driver circuit through a resistor R95.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921181970.0U CN209896433U (en) | 2019-07-25 | 2019-07-25 | Butterfly laser drive circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201921181970.0U CN209896433U (en) | 2019-07-25 | 2019-07-25 | Butterfly laser drive circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN209896433U true CN209896433U (en) | 2020-01-03 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201921181970.0U Active CN209896433U (en) | 2019-07-25 | 2019-07-25 | Butterfly laser drive circuit |
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| Country | Link |
|---|---|
| CN (1) | CN209896433U (en) |
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2019
- 2019-07-25 CN CN201921181970.0U patent/CN209896433U/en active Active
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