Laser high-speed beat frequency signal amplification circuit

Abstract

The utility model provides a laser high-speed beat frequency signal amplification circuit which comprises a first integrated circuit, a second integrated circuit, a feedback loop group, a filtering loop group, a first load part, a first amplification part, a second amplification part, a third amplification part, a fourth amplification part, a fifth amplification part and a power supply. The voltage signals are converted into voltage signals at the first integrated circuit integrated operational amplifier, and direct current components are filtered out through the feedback loop group and the filtering loop group. The alternating voltage is amplified at the second integrated circuit integrated operational amplifier, the amplification factor is adjusted by the first amplification piece, the second amplification piece, the third amplification piece and the fourth amplification piece, and the fifth amplification piece is in amplification factor redundancy design. An amplification circuit integrated operational amplifier is powered by positive and negative power supplies, and bandwidth parameters of the integrated operational amplifier are selected according to technical indexes of carrier rotation angular velocity. The modular design reduces the length of a signal path, reduces the influence of distributed capacitance and inductance, improves the fidelity of a high-frequency signal, and facilitates the integration and maintenance of a system.

Description

TECHNICAL FIELD

[0001] The utility model relates to technical fields especially relates to a laser high speed beat frequency signal amplification circuit. BACKGROUND

[0002] Laser is applied in navigation field more and more, according to its characteristics, it is used in industrial field such as direction correction, target positioning, and these fields are mostly static laser application, but using dynamic laser characteristics to carry out attitude positioning and control is not common, so a kind of amplification circuit is needed to process the signal of dynamic laser. UTILITY MODEL CONTENT

[0003] Therefore, the utility model provides a laser high speed beat frequency signal amplification circuit to solve the problems in the background art.

[0004] In order to achieve the above purpose, the utility model provides a laser high speed beat frequency signal amplification circuit, first integrated circuit DA1, second integrated circuit DA2, feedback loop group, filter loop group, first load, first amplifying part, second amplifying part, third amplifying part, fourth amplifying part, fifth amplifying part and power supply;

[0005] The 2 pin of first integrated circuit DA1 is connected with the input end of power supply, the 2 pin of first integrated circuit DA1 is also connected with feedback loop group and then connected with the 6 pin of first integrated circuit DA1, the feedback loop group is also connected with filter loop group and then connected with the 6 pin of first integrated circuit DA1, the filter loop group is connected with first load and then grounded, the 3 pin of first integrated circuit DA1 is connected with capacitor C1 and resistor R1 and then grounded, the resistor R1 is also connected with capacitor C2 and then connected with resistor R2, the 4 pin of first integrated circuit DA1 is connected with capacitor C5 and then grounded, the 4 pin of first integrated circuit DA1 is also connected with resistor R6 and then connected with the negative pole of power supply, the 7 pin of first integrated circuit DA1 is connected with resistor R5 and then connected with the positive pole of power supply, the 7 pin of first integrated circuit DA1 is also connected with capacitor C4 and then grounded, the capacitor C4 is also connected with the positive pole of diode ZD1, the negative pole of diode ZD1 is connected with resistor R2, and the resistor R2 is connected with the positive pole of power supply;

[0006] Capacitor C8 and capacitor C9 are connected in series and then connected in parallel with the first amplifier; the 2 pin of the second integrated circuit DA2 is connected with the capacitor C8, the capacitor C9 and the first amplifier respectively and then connected with the output end of the power supply; the 2 pin of the second integrated circuit DA2 is also connected with the second amplifier, the third amplifier and the fourth amplifier in series and then grounded; the 2 pin of the second integrated circuit DA2 is also connected with the second amplifier and then connected with the fifth amplifier; the fifth amplifier is grounded; the 3 pin of the second integrated circuit DA2 is connected with the filter circuit group; the 6 pin of the second integrated circuit DA2 is connected with the resistor R12 and then connected with the output end of the power supply; the resistor R12 is connected with the resistor R11 and the capacitor C9 respectively; the 4 pin of the second integrated circuit DA2 is connected with the resistor R13 and then connected with the negative pole of the power supply; the 4 pin of the second integrated circuit DA2 is also connected with the capacitor C10 and then grounded; the 7 pin of the second integrated circuit DA2 is connected with the resistor R14 and then connected with the positive pole of the power supply; the 7 pin of the second integrated circuit DA2 is also connected with the capacitor C11 and then grounded.

[0007] In one of the embodiments, the 1 pin of the power supply is the output end of the power supply, the 2 pin of the power supply is the input end of the power supply, the 3 pin of the power supply is the negative pole of the power supply, the 4 pin of the power supply is the positive pole of the power supply, and the 5 pin of the power supply is grounded.

[0008] In one of the embodiments, the 1 pin of the power supply is the output end of the power supply, the 2 pin of the power supply is the input end of the power supply, the 3 pin of the power supply is the negative pole of the power supply, the 4 pin of the power supply is the positive pole of the power supply, and the 5 pin of the power supply is grounded.

[0009] In one of the embodiments, the first feedback member is a resistor R3, the second feedback member is a resistor R4, and the third feedback member is a capacitor C3.

[0010] In one of the embodiments, the filter circuit group comprises a first filter member and a second filter member.

[0011] The first filter member is connected in parallel with the second filter member.

[0012] In one of the embodiments, the first filter member is a capacitor C6 and the second filter member is a capacitor C7.

[0013] In one of the embodiments, the first load member is a resistor R7, the first amplifier is a resistor R11, the second amplifier is a resistor R8, the third amplifier is a resistor R9, the fourth amplifier is a resistor R10, and the fifth amplifier is a resistor R15.

[0014] From the above, it can be seen that the utility model provides a kind of laser high-speed beat frequency signal amplification circuit, current-voltage conversion function is realized by the current of first integrated circuit, high sensitivity conversion of weak current signal is realized, and the high input impedance of operational amplifier reduces signal attenuation.Frequency compensation function is matched with impedance in feedback loop group, both stabilize operational amplifier operating point, and inhibit high-frequency noise, improve the overall stability of circuit.The AC coupling circuit formed by filter loop group effectively removes the DC bias in photoelectric signal, avoids saturation or nonlinear distortion caused by DC component in subsequent amplification link.The flexible configuration of first amplifying piece, second amplifying piece, third amplifying piece and fourth amplifying piece can accurately adjust the voltage amplification multiple of second integrated circuit, adapt to different signal intensity demand (such as weak signal amplification or large dynamic range processing).As redundant resistance, fifth amplifying piece can still maintain the basic function of circuit in extreme condition (such as the failure of certain resistance), enhance system fault tolerance.The positive and negative dual power supply makes the output swing of operational amplifier cover the positive and negative voltage range, avoids the clipping effect of single power supply, significantly expands the dynamic range, and is suitable for processing large amplitude AC signal.The modular design of the utility model reduces signal path length, reduces the influence of distributed capacitance and inductance, improves high-frequency signal fidelity, and is convenient for system integration and maintenance.Feedback network and resistance redundancy design can partially compensate the performance changes caused by temperature drift and component aging, prolong the service life of circuit. BRIEF DESCRIPTION OF DRAWINGS

[0015] In order to more clearly illustrate the technical scheme in the embodiments of the utility model or prior art, the drawings needed to be used in the embodiment or prior art description will be briefly introduced, and obviously, the drawings in the following description are only some embodiments of the utility model, and for those skilled in the art, other drawings can be obtained without creative labor on the basis of these drawings.

[0016] Figure 1 It is a kind of laser high-speed beat frequency signal amplification circuit schematic diagram for the utility model embodiment. DETAILED DESCRIPTION

[0017] In order to make the purpose, technical scheme and advantages of the utility model more clearly, the following will be combined with specific embodiment, and the utility model is further detailed by referring to drawings.

[0018] It should be noted that, unless otherwise defined, technical terms or scientific terms used in the embodiments of the present application shall have the common meanings understood by those skilled in the art to which the present application belongs. The terms "first", "second" and similar terms used in the present application do not represent any order, number or importance, but are only used to distinguish different components. The terms "include" or "contain" and similar terms mean that the elements or objects before the terms cover the elements or objects listed after the terms and their equivalents, and do not exclude other elements or objects. The terms "connect" or "connected" and similar terms are not limited to physical or mechanical connections, but can include electrical connections, whether direct or indirect. The terms "upper", "lower", "left", "right" and the like are only used to represent relative positional relationships, and when the absolute positions of the described objects change, the relative positional relationships may also change accordingly.

[0019] As shown in Figure 1 The present application provides a kind of laser high-speed beat frequency signal amplification circuit, it include: first integrated circuit DA1, second integrated circuit DA2, feedback loop group, filter loop group, first load, first amplifying part, second amplifying part, third amplifying part, fourth amplifying part, fifth amplifying part, power supply.Specifically, first load uses resistance R7, first amplifying part uses resistance R11, second amplifying part uses resistance R8, third amplifying part uses resistance R9, fourth amplifying part uses resistance R10, fifth amplifying part uses resistance R15.

[0020] Feedback loop group includes: first feedback, second feedback and third feedback, first feedback and third feedback are connected in series with second feedback parallel connection.Specifically, first feedback uses resistance R3, second feedback uses resistance R4, third feedback uses capacitor C3.

[0021] Filter loop group includes: first filter and second filter, first filter and second filter are connected in parallel.Specifically, first filter uses capacitor C6, second filter uses capacitor C7.

[0022] The pin 2 of the first integrated circuit DA1 is connected with the input end of the power supply; the pin 2 of the first integrated circuit DA1 is also connected with the feedback loop group and then connected with the pin 6 of the first integrated circuit DA1; the feedback loop group is also connected with the filtering loop group and then connected with the pin 6 of the first integrated circuit DA1; the filtering loop group is connected with the first load and then grounded; the pin 3 of the first integrated circuit DA1 is connected with the capacitor C1 and the resistor R1 respectively and then grounded; the resistor R1 is also connected with the capacitor C2 and then connected with the resistor R2; the pin 4 of the first integrated circuit DA1 is connected with the capacitor C5 and then grounded; the pin 4 of the first integrated circuit DA1 is also connected with the resistor R6 and then connected with the negative pole of the power supply; the pin 7 of the first integrated circuit DA1 is connected with the resistor R5 and then connected with the positive pole of the power supply; the pin 7 of the first integrated circuit DA1 is also connected with the capacitor C4 and then grounded; the capacitor C4 is also connected with the positive pole of the diode ZD1; the negative pole of the diode ZD1 is connected with the resistor R2; the resistor R2 is connected with the positive pole of the power supply.

[0023] The capacitor C8 and the capacitor C9 are connected in series and then connected in parallel with the first amplifying element; the pin 2 of the second integrated circuit DA2 is connected with the capacitor C8, the capacitor C9 and the first amplifying element respectively and then connected with the output end of the power supply; the pin 2 of the second integrated circuit DA2 is also connected with the second amplifying element, the third amplifying element and the fourth amplifying element in series and then grounded; the pin 2 of the second integrated circuit DA2 is also connected with the second amplifying element and then connected with the fifth amplifying element; the fifth amplifying element is grounded; the pin 3 of the second integrated circuit DA2 is connected with the filtering loop group; the pin 6 of the second integrated circuit DA2 is connected with the resistor R12 and then connected with the output end of the power supply; the resistor R12 is connected with the resistor R11 and the capacitor C9 respectively; the pin 4 of the second integrated circuit DA2 is connected with the resistor R13 and then connected with the negative pole of the power supply; the pin 4 of the second integrated circuit DA2 is also connected with the capacitor C10 and then grounded; the pin 7 of the second integrated circuit DA2 is connected with the resistor R14 and then connected with the positive pole of the power supply; the pin 7 of the second integrated circuit DA2 is also connected with the capacitor C11 and then grounded.

[0024] The pin 1 of the power supply is the output end of the power supply, the pin 2 of the power supply is the input end of the power supply, the pin 3 of the power supply is the negative pole of the power supply, the pin 4 of the power supply is the positive pole of the power supply, and the pin 5 of the power supply is grounded.

[0025] The current is input through the 2-pin of the first integrated circuit DA1, converted into a voltage signal at the integrated operational amplifier of the first integrated circuit DA1, the first feedback component, the second feedback component and the third feedback component form a feedback loop, and the first filter component and the second filter component filter out the direct current component. The alternating voltage is amplified at the integrated operational amplifier of the second integrated circuit DA2, the amplification multiple is adjusted by the first amplification component, the second amplification component, the third amplification component and the fourth amplification component, and the fifth amplification component is a redundant design of the amplification multiple. The integrated operational amplifier of the amplification circuit is powered by positive and negative dual power supply, and the bandwidth parameter of the integrated operational amplifier is selected according to the technical index of the rotation speed of the carrier. When the carrier operates at a low rotation speed, the bandwidth parameter of the integrated operational amplifier is generally selected between 8MHz and 40MHz, which can also meet the requirements.

[0026] The laser high-speed beat frequency signal amplification circuit provided by the utility model realizes high-sensitivity conversion of weak current signals through the current-voltage conversion function of the first integrated circuit, and the high input impedance of the operational amplifier reduces signal attenuation. The feedback loop set has impedance matching and frequency compensation functions, stabilizes the operational amplifier operating point, suppresses high-frequency noise, and improves the overall stability of the circuit. The AC coupling circuit composed of the filter loop set effectively removes the direct current bias in the photoelectric signal, avoiding saturation or nonlinear distortion caused by direct current components in the subsequent amplification link. The flexible configuration of the first amplification component, the second amplification component, the third amplification component and the fourth amplification component can accurately adjust the voltage amplification multiple of the second integrated circuit, and adapt to different signal intensity requirements (such as weak signal amplification or large dynamic range processing). The fifth amplification component serves as a redundant resistor and can still maintain the basic function of the circuit in extreme cases (such as failure of a certain resistor), enhancing the fault tolerance of the system. Positive and negative dual power supply makes the operational amplifier output swing cover the positive and negative voltage range, avoiding the clipping effect of single power supply, significantly expanding the dynamic range, and being suitable for processing large amplitude alternating signals. The modular design of the utility model reduces the signal path length, reduces the influence of distributed capacitance and inductance, improves the fidelity of high-frequency signals, and is convenient for system integration and maintenance. The feedback network and resistance redundancy design can partially compensate for the performance changes caused by temperature drift and component aging, prolonging the service life of the circuit.

[0027] Those skilled in the art should understand that the above discussion of any embodiment is only exemplary and is not intended to limit the scope of the utility model (including claims) to these examples; under the idea of the utility model, the technical features in the above embodiments or different embodiments can also be combined, the steps can be implemented in any order, and there are many other changes of different aspects of the utility model as described above. In order to be brief, they are not provided in details.

[0028] Embodiments of the present application are intended to encompass all such alternatives, modifications and variations falling within the broad scope of the appended claims. Accordingly, any omission, modification, substitution, improvement, etc. made within the spirit and principle of the present application shall be included in the scope of protection of the present application.

Claims

1. A laser high speed beat frequency signal amplification circuit, characterized by, The application relates to a power supply circuit, which comprises a first integrated circuit DA1, a second integrated circuit DA2, a feedback loop set, a filtering loop set, a first load, a first amplifier, a second amplifier, a third amplifier, a fourth amplifier, a fifth amplifier and a power supply; the 2-pin of the first integrated circuit DA1 is connected with an input end of the power supply; the 2-pin of the first integrated circuit DA1 is also connected with the feedback loop set and then connected with the 6-pin of the first integrated circuit DA1; the feedback loop set is also connected with the filtering loop set and then connected with the 6-pin of the first integrated circuit DA1; the filtering loop set is connected with the first load and then grounded; the 3-pin of the first integrated circuit DA1 is connected with a capacitor C1 and a resistor R1 respectively and then grounded; the resistor R1 is also connected with a capacitor C2 and then connected with a resistor R2; the 4-pin of the first integrated circuit DA1 is connected with a capacitor C5 and then grounded; the 4-pin of the first integrated circuit DA1 is also connected with a resistor R6 and then connected with a negative pole of the power supply; the 7-pin of the first integrated circuit DA1 is connected with a resistor R5 and then connected with a positive pole of the power supply; the 7-pin of the first integrated circuit DA1 is also connected with a capacitor C4 and then grounded; the capacitor C4 is also connected with a positive pole of a diode ZD1; a negative pole of the diode ZD1 is connected with the resistor R2; the resistor R2 is connected with the positive pole of the power supply; the capacitor C8 and the capacitor C9 are connected in series and then connected in parallel with the first amplifier; the 2-pin of the second integrated circuit DA2 is connected with the capacitor C8, the capacitor C9 and the first amplifier respectively and then connected with an output end of the power supply; the 2-pin of the second integrated circuit DA2 is also connected with the second amplifier, the third amplifier and the fourth amplifier in series and then grounded; the 2-pin of the second integrated circuit DA2 is also connected with the second amplifier and then connected with the fifth amplifier; the fifth amplifier is grounded; the 3-pin of the second integrated circuit DA2 is connected with the filtering loop set; the 6-pin of the second integrated circuit DA2 is connected with a resistor R12 and then connected with the output end of the power supply; the resistor R12 is connected with the resistor R11 and the capacitor C9 respectively; the 4-pin of the second integrated circuit DA2 is connected with a resistor R13 and then connected with the negative pole of the power supply; the 4-pin of the second integrated circuit DA2 is also connected with a capacitor C10 and then grounded; the 7-pin of the second integrated circuit DA2 is connected with a resistor R14 and then connected with the positive pole of the power supply; the 7-pin of the second integrated circuit DA2 is also connected with a capacitor C11 and then grounded. The 1-pin of the power supply is an output end of the power supply, the 2-pin of the power supply is an input end of the power supply, the 3-pin of the power supply is a negative pole of the power supply, the 4-pin of the power supply is a positive pole of the power supply and the 5-pin of the power supply is grounded. The feedback loop set comprises a first feedback, a second feedback and a third feedback. The first feedback and the third feedback are connected in series and then connected in parallel with the second feedback.

2. The laser high-speed beat signal amplification circuit according to claim 1, wherein The first feedback is a resistor R3, the second feedback is a resistor R4 and the third feedback is a capacitor C3.

3. The laser high-speed beat signal amplification circuit according to claim 1, wherein ​ ​ 4. The laser high-speed beat signal amplification circuit according to claim 3, wherein ​ 5. The laser high-speed beat signal amplification circuit according to claim 1, wherein The filter circuit set comprises a first filter and a second filter. The first filter and the second filter are connected in parallel.

6. The laser high-speed beat signal amplification circuit according to claim 5, wherein The first filter is a capacitor C6, and the second filter is a capacitor C7.

7. The laser high-speed beat signal amplification circuit according to claim 1, wherein The first load is a resistor R7, the first amplifier is a resistor R11, the second amplifier is a resistor R8, the third amplifier is a resistor R9, the fourth amplifier is a resistor R10, and the fifth amplifier is a resistor R15.

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