CN203645633U - Infrared signal amplification circuit - Google Patents
Infrared signal amplification circuit Download PDFInfo
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- CN203645633U CN203645633U CN201320888469.4U CN201320888469U CN203645633U CN 203645633 U CN203645633 U CN 203645633U CN 201320888469 U CN201320888469 U CN 201320888469U CN 203645633 U CN203645633 U CN 203645633U
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- operational amplifier
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Abstract
The utility model provides an infrared signal amplification circuit which comprises an infrared signal input end, an amplification circuit output end and an amplification circuit connected between the infrared signal input end and the amplification circuit output end. The amplification circuit comprises a primary operational amplifier and a secondary operational amplifier which are connected in sequence, wherein the positive and negative input ends of the primary operational amplifier and the secondary operational amplifier are connected with bias voltage, and a first NPN-type audion is connected between the output end and the reserve input end of the primary operational amplifier. The characteristics of an amplified object signal are fully considered in design, the infrared signal amplification circuit adopts multistage amplification, multistage filtering is increased, and interference signals are removed. On the basis of traditional signal amplification, the anti-saturation circuit audion is especially added, so that useful data signals can be amplified, the disadvantage that the signals are amplified to be saturated in a close-range mode is also avoided, temperature compensation is achieved, and the interference influence on the signals is greatly avoided.
Description
Technical field
The utility model relates to a kind of amplifying circuit, relates to particularly a kind of infrared signal amplifying circuit.
Background technology
Utilize infrared ray to carry out the communication modes of transfer of data as carrier, have simplicity of design, the advantage that cost is low.There are the following problems in actual applications for infrared signal: 1, infrared ray is a kind of invisible light in sunray, is easy to be subject to the impact of surround lighting, causes the signal that infrared signal is transmitted to be interfered; 2, infrared signal transmission is in-plant point-to-point communication mode, communication distance near far away, the infrared light intensity difference that infrared sensor is sensed, its output signal power is also different, after generally signal being amplified by amplifying circuit, transmit, existing amplifying circuit mostly design is improper, or causes distant signal effectively not amplified, or the saturated problem of signal closely, attend to one thing and lose sight of another, signal transmission distance " is not far become, closely not ", and the signal after amplifying, disturbs excessive.
Utility model content
Improper for solving existing infrared Design of Amplification Circuit, or can not effectively be amplified, or there is the problem that signal is saturated, the utility model proposes a kind of infrared signal amplifying circuit, and be achieved by the following technical solutions:
A kind of infrared signal amplifying circuit, comprise infrared signal input, amplification circuit output end and be connected to the amplifying circuit between described infrared signal input and amplification circuit output end, wherein, described amplifying circuit comprises the one-level operational amplifier and the two-level operating amplifier that connect successively, on the positive and negative input of described one-level operational amplifier and two-level operating amplifier, all connect bias voltage, between one-level operational amplifier output terminal and reverse input end, be connected with a NPN type triode.
Further, also comprise the three-stage operational amplifier between output and the amplification circuit output end that is connected to described two-level operating amplifier, on the positive and negative input of described three-stage operational amplifier, also all connect bias voltage, between described two-level operating amplifier output and reverse input end, be connected with second and third NPN type triode being connected in series.
Further, described bias voltage comprises the first bias voltage that system power supply voltage provides, and/or the second bias voltage of providing of biasing circuit, this biasing circuit comprises the second bias voltage output, between this second bias voltage output and system power supply voltage, be connected with four-operational amplifier, the positive input terminal of this operational amplifier is connected with gain-adjusted resistance, and output connects the second bias voltage output.
Further, between described infrared signal input and the positive input terminal of described one-level operational amplifier, be connected with filter circuit.
Further, be all connected with high-pass filtering circuit on the input of described I and II operational amplifier, three-stage operational amplifier input is connected with low-pass filter circuit.
Further, described filter circuit comprises the filtered diode and the filter resistance that are connected in parallel between infrared signal input and ground.
Further, described high-pass filtering circuit comprises the resistance and the electric capacity that are connected in series.
Further, described low-pass filter circuit comprise be connected to the resistance between described two-level operating amplifier and described three-stage operational amplifier and be connected to three-stage operational amplifier and ground between electric capacity.
Compared with prior art, advantage of the present utility model and good effect are as follows:
1, the utility model circuit has taken into full account the feature that is exaggerated object signal in design, adopt multistage amplification, increase multiple-stage filtering, remove interference signal, on the basis of amplifying in classical signal, increased especially Saturationproof circuit triode, the data-signal that both can ensure use is exaggerated, while having avoided again closely, signal is amplified to saturated drawback, and has realized temperature-compensating, has greatly removed and has disturbed the impact on signal.
2, the bias voltage of the each operational amplifier of the utility model can only be provided by biasing circuit, and wherein said biasing circuit is realized by amplifier, does not need to increase other chips on the one hand, has saved cost, and precision is high on the other hand, and anti-interference is good; Also can be provided by biasing circuit and system power supply voltage, this measure is disturbed under the specific conditions of work such as strong or limit test at signal, can improve better the interference free performance of amplifying circuit.
Read by reference to the accompanying drawings after embodiment of the present utility model, other features of the present utility model and advantage will become clearer.
Accompanying drawing explanation
In order to be illustrated more clearly in the utility model embodiment or technical scheme of the prior art, to the accompanying drawing of required use in embodiment or description of the Prior Art be briefly described below, apparently, accompanying drawing in the following describes is embodiment more of the present utility model, for those of ordinary skills, do not paying under the prerequisite of creative work, can also obtain according to these accompanying drawings other accompanying drawing.
Fig. 1 is the utility model embodiment mono-infrared signal amplifying circuit theory diagram;
Fig. 2 is the utility model embodiment mono-infrared signal amplifying circuit schematic diagram;
Fig. 3 is the utility model embodiment bis-infrared signal amplifying circuit schematic diagrams;
Fig. 4 is the utility model embodiment tri-infrared signal amplifying circuit theory diagrams;
Fig. 5 is biasing circuit schematic diagram.
Embodiment
Below in conjunction with the drawings and specific embodiments, the utility model is described in detail.
Embodiment mono-, with reference to figure 1, the present embodiment proposes a kind of output electrical signals to infrared sensor and amplifies, and the saturated amplifying circuit of anti-stop signal, comprises filter circuit, one-level, secondary, three-stage amplifier, five major part compositions of biasing circuit.Filter circuit is used for the output signal of preliminary treatment from photoelectric sensor, one-level, secondary, three-stage amplifier carry out filtering and amplify and process signal respectively, and in one-level, second amplifying circuit, increase anti-saturated function, the bias voltage that biasing circuit provides amplifying circuit to need, improves stability and anti-interference that signal amplifies.
Its electrical schematic diagram is with reference to figure 2, and Fig. 5, the present embodiment infrared signal amplifying circuit comprises infrared signal input SIGNAL_IN, amplification circuit output end SIGNAL_OUT is connected successively one-level operational amplifier U1-A, two-level operating amplifier U1-B, three-stage operational amplifier U2-A between input SIGNAL_IN and output SIGNAL_OUT.Supersaturation problem while amplification for fear of strong signal, the output of one-level operational amplifier U1-A, two-level operating amplifier U1-B is connected with Saturationproof circuit.
For too high interference signal in the infrared input signal of filtering, the present embodiment infrared signal was first passed through the filter circuit being connected on infrared signal input SIGNAL_IN before entering one-level operational amplifier U1-A, this filter circuit comprises the filtered diode D0 and the filter resistance R0 that are connected between infrared signal input and ground, certainly also can adopt other capacitor filters according to actual conditions.
In one-level amplifying circuit, the high-pass filtering circuit being made up of resistance R 10, capacitor C 10 is connected between infrared signal input SIGNAL_IN and the positive input terminal of one-level operational amplifier U1-A, the low-frequency disturbance in main filtered signal, resistance R 12 and C11 are connected between the output and negative input end of one-level operational amplifier U1-A, adjust and frequency-selecting to realize gain, the base stage of NPN type triode Q1 and collector electrode are connected to the output of one-level operational amplifier U1-A, emitter is connected to the negative input end of one-level operational amplifier U1-A, Q1 comprises two PN junctions, not only can realize anti-saturated function, the signal amplitude of restriction before and after amplifying is poor does not press higher than the para-electric of Q1, effectively avoid signal saturated, can also realize temperature-compensating (is that one-level operational amplifier U1-A has certain temperature coefficient, its output signal can vary with temperature and drift about, be called " temperature is floated ", and can offsetting or reduce the temperature of its output to a certain extent, floats Q1, the temperature-compensating of Here it is Q1).In addition, with reference to figure 5, form biasing circuit by resistance R 11, resistance R 13 and external bias voltage VN, can increase the stability of the anti-interference of circuit and assurance signal.Particularly, provide the biasing circuit of bias voltage output to comprise and be connected to four-operational amplifier U2-B between bias voltage output VN and system power supply voltage VCC, the positive input terminal of this amplifier U2-B is on the one hand by capacitor C 41 ground connection, on the other hand by resistance R 42 ground connection, again on the one hand by resistance R 41 connected system supply power voltage VCC, the output of amplifier U2-B connects bias voltage VN, the value of regulating resistance R41 or resistance R 42, change the ratio of system voltage through two resistance, thereby can obtain according to demand the high accuracy bias voltage of hope.This bias voltage can effectively overcome the offset drift phenomenon of operational amplifier, and certainly, biasing circuit also can adopt other voltage stabilizing chips to provide, the present embodiment provides bias voltage not need to increase on the one hand other chips by amplifier, saved cost, precision is high on the other hand, and anti-interference is good.
Formation and the one-level of second amplifying circuit are similar, resistance R 20 and capacitor C 20 form high pass filter in order to the interference signal in filtering one-level amplifying circuit output signal, resistance R 22 and C21 realize gain adjustment and the frequency-selecting of secondary operational amplification circuit, the composition that is its anti-saturated clamp circuit with the difference of one-level amplifying circuit is made up of NPN type triode Q2 and Q3, the base stage of triode Q3 and collector electrode are connected to the output of two-level operating amplifier U1-B, emitter is connected to base stage and the collector electrode of triode Q2, the emitter of triode Q2 is connected to the negative input end of two-level operating amplifier U1-B.Biasing circuit can effectively improve the anti-interference of input signal, reduce the impact of offset voltage on amplifying signal, particularly, by resistance R 21, the bias voltage VN of positive input terminal that is connected to two-level operating amplifier U1-B, and be connected to the resistance R 23 of negative input end, the biasing circuit of bias voltage VN composition two-level operating amplifier.Similarly, in second amplifying circuit, NPN type triode Q2 and Q3 also can realize temperature-compensating.
Formation and the second amplifying circuit of three-stage amplifier are similar, resistance R 30 and capacitor C 30 form low pass filter in order to the low-frequency interference signal in further filtering second amplifying circuit output signal, and resistance R 32 and capacitor C 31 realize gain adjustment and the frequency-selecting of three-stage operational amplifying circuit.The formation of biasing circuit and I and II amplifying circuit are similar, particularly, by resistance R 31, the VN of positive input terminal that is connected to three-stage operational amplifier U2-A, are connected to the resistance R 33 of negative input, the biasing circuit of VN composition three-stage operational amplifier.Be with the difference of I and II amplifying circuit: removed Saturationproof circuit part, the signal after final amplification is exported through resistance R 40.
In the present embodiment, operational amplifier U1-A, U1-B, U2-A, U2-B can select the BU7242SFVM-TR operational amplifier of ROHM company, but is not limited to this.
The present embodiment can be in improving signal amplification factor to greatest extent, takes into account the closely amplification effect of strong signal, the saturation problem while avoiding strong signal to amplify.In addition, can be in the amplification range limiting, flexible multiplication factor, meets design needs.
Embodiment bis-, with reference to figure 3, be with the difference of embodiment bis-: consider the input signal of one-level operational amplifier original just a little less than, if increase bias voltage, useful signal will decline to a great extent, and secondary and three-stage operational amplifier are after the amplification of its previous stage operational amplifier, increase again bias voltage less on the impact of useful signal, therefore according to actual specific needs, second of the present embodiment, the bias voltage of three-stage amplifier is provided by biasing circuit on the one hand, as VN, provided by system power supply voltage VCC on the other hand, and then provide biasing by corresponding resistor to amplifier, under specific condition of work, can improve better the interference free performance of amplifying circuit.
Embodiment tri-, with reference to figure 4, be with the difference of embodiment mono-: according to actual needs, the present embodiment adopts two-stage to amplify, be one-level, second amplifying circuit, one-level, second amplifying circuit carry out filtering and amplify and process signal respectively, and only in one-level amplifying circuit, have increased anti-saturated function.Other electrical principle similar embodiment one repeat no more herein.
Certainly, according to the requirement of different circuit, can select to increase operational amplification circuit, be chosen in secondary operational amplification circuit simultaneously and increase Saturationproof circuit.
The above, be only preferred embodiment of the present utility model, is not to restriction of the present utility model, and any those skilled in the art may utilize the technology contents of above-mentioned announcement to be changed or be modified as the equivalent embodiment of equivalent variations.But, every technical solutions of the utility model content that do not depart from, any simple modification, equivalent variations and the remodeling above embodiment done according to technical spirit of the present utility model, still belong to the protection range of technical solutions of the utility model.
Claims (8)
1. an infrared signal amplifying circuit, comprise infrared signal input, amplification circuit output end and be connected to the amplifying circuit between described infrared signal input and amplification circuit output end, it is characterized in that: described amplifying circuit comprises the one-level operational amplifier and the two-level operating amplifier that connect successively, on the positive and negative input of described one-level operational amplifier and two-level operating amplifier, all connect bias voltage, between one-level operational amplifier output terminal and reverse input end, be connected with a NPN type triode.
2. infrared signal amplifying circuit according to claim 1, it is characterized in that: also comprise the three-stage operational amplifier between output and the amplification circuit output end that is connected to described two-level operating amplifier, on the positive and negative input of described three-stage operational amplifier, also all connect bias voltage, between described two-level operating amplifier output and reverse input end, be connected with second and third NPN type triode being connected in series.
3. infrared signal amplifying circuit according to claim 1 and 2, it is characterized in that: described bias voltage comprises the first bias voltage that system power supply voltage provides, and/or the second bias voltage of providing of biasing circuit, this biasing circuit comprises the second bias voltage output, between this second bias voltage output and system power supply voltage, be connected with four-operational amplifier, the positive input terminal of this operational amplifier is connected with gain-adjusted resistance, and output connects the second bias voltage output.
4. infrared signal amplifying circuit according to claim 3, is characterized in that: between described infrared signal input and the positive input terminal of described one-level operational amplifier, be connected with filter circuit.
5. infrared signal amplifying circuit according to claim 4, is characterized in that: on the input of described I and II operational amplifier, be all connected with high-pass filtering circuit, three-stage operational amplifier input is connected with low-pass filter circuit.
6. infrared signal amplifying circuit according to claim 4, is characterized in that: described filter circuit comprises the filtered diode and the filter resistance that are connected in parallel between infrared signal input and ground.
7. infrared signal amplifying circuit according to claim 5, is characterized in that: described high-pass filtering circuit comprises the resistance and the electric capacity that are connected in series.
8. infrared signal amplifying circuit according to claim 5, is characterized in that: described low-pass filter circuit comprise be connected to the resistance between described two-level operating amplifier and described three-stage operational amplifier and be connected to three-stage operational amplifier and ground between electric capacity.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201320888469.4U CN203645633U (en) | 2013-12-31 | 2013-12-31 | Infrared signal amplification circuit |
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| CN201320888469.4U CN203645633U (en) | 2013-12-31 | 2013-12-31 | Infrared signal amplification circuit |
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Cited By (11)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701416A (en) * | 2013-12-31 | 2014-04-02 | 青岛歌尔声学科技有限公司 | Infrared signal amplifying circuit |
| WO2018176290A1 (en) * | 2017-03-29 | 2018-10-04 | SZ DJI Technology Co., Ltd. | Light detection and ranging (lidar) signal processing circuitry |
| US10120068B1 (en) | 2017-04-28 | 2018-11-06 | SZ DJI Technology Co., Ltd. | Calibration of laser sensors |
| US10152771B1 (en) | 2017-07-31 | 2018-12-11 | SZ DJI Technology Co., Ltd. | Correction of motion-based inaccuracy in point clouds |
| CN109116369A (en) * | 2017-06-23 | 2019-01-01 | 三星电子株式会社 | Distance-measuring device and its method |
| US10295659B2 (en) | 2017-04-28 | 2019-05-21 | SZ DJI Technology Co., Ltd. | Angle calibration in light detection and ranging system |
| US10371802B2 (en) | 2017-07-20 | 2019-08-06 | SZ DJI Technology Co., Ltd. | Systems and methods for optical distance measurement |
| US10436884B2 (en) | 2017-04-28 | 2019-10-08 | SZ DJI Technology Co., Ltd. | Calibration of laser and vision sensors |
| US10554097B2 (en) | 2017-03-29 | 2020-02-04 | SZ DJI Technology Co., Ltd. | Hollow motor apparatuses and associated systems and methods |
| US10641875B2 (en) | 2017-08-31 | 2020-05-05 | SZ DJI Technology Co., Ltd. | Delay time calibration of optical distance measurement devices, and associated systems and methods |
| US10714889B2 (en) | 2017-03-29 | 2020-07-14 | SZ DJI Technology Co., Ltd. | LIDAR sensor system with small form factor |
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2013
- 2013-12-31 CN CN201320888469.4U patent/CN203645633U/en not_active Expired - Lifetime
Cited By (21)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103701416A (en) * | 2013-12-31 | 2014-04-02 | 青岛歌尔声学科技有限公司 | Infrared signal amplifying circuit |
| US10714889B2 (en) | 2017-03-29 | 2020-07-14 | SZ DJI Technology Co., Ltd. | LIDAR sensor system with small form factor |
| US10539663B2 (en) | 2017-03-29 | 2020-01-21 | SZ DJI Technology Co., Ltd. | Light detecting and ranging (LIDAR) signal processing circuitry |
| US11336074B2 (en) | 2017-03-29 | 2022-05-17 | SZ DJI Technology Co., Ltd. | LIDAR sensor system with small form factor |
| WO2018176290A1 (en) * | 2017-03-29 | 2018-10-04 | SZ DJI Technology Co., Ltd. | Light detection and ranging (lidar) signal processing circuitry |
| US10554097B2 (en) | 2017-03-29 | 2020-02-04 | SZ DJI Technology Co., Ltd. | Hollow motor apparatuses and associated systems and methods |
| US10436884B2 (en) | 2017-04-28 | 2019-10-08 | SZ DJI Technology Co., Ltd. | Calibration of laser and vision sensors |
| US10120068B1 (en) | 2017-04-28 | 2018-11-06 | SZ DJI Technology Co., Ltd. | Calibration of laser sensors |
| US10295659B2 (en) | 2017-04-28 | 2019-05-21 | SZ DJI Technology Co., Ltd. | Angle calibration in light detection and ranging system |
| US10698092B2 (en) | 2017-04-28 | 2020-06-30 | SZ DJI Technology Co., Ltd. | Angle calibration in light detection and ranging system |
| US11460563B2 (en) | 2017-04-28 | 2022-10-04 | SZ DJI Technology Co., Ltd. | Calibration of laser sensors |
| US10859685B2 (en) | 2017-04-28 | 2020-12-08 | SZ DJI Technology Co., Ltd. | Calibration of laser sensors |
| US10884110B2 (en) | 2017-04-28 | 2021-01-05 | SZ DJI Technology Co., Ltd. | Calibration of laser and vision sensors |
| CN109116369B (en) * | 2017-06-23 | 2023-10-20 | 三星电子株式会社 | Distance measuring device and method thereof |
| CN109116369A (en) * | 2017-06-23 | 2019-01-01 | 三星电子株式会社 | Distance-measuring device and its method |
| US10371802B2 (en) | 2017-07-20 | 2019-08-06 | SZ DJI Technology Co., Ltd. | Systems and methods for optical distance measurement |
| US11982768B2 (en) | 2017-07-20 | 2024-05-14 | SZ DJI Technology Co., Ltd. | Systems and methods for optical distance measurement |
| US11238561B2 (en) | 2017-07-31 | 2022-02-01 | SZ DJI Technology Co., Ltd. | Correction of motion-based inaccuracy in point clouds |
| US11961208B2 (en) | 2017-07-31 | 2024-04-16 | SZ DJI Technology Co., Ltd. | Correction of motion-based inaccuracy in point clouds |
| US10152771B1 (en) | 2017-07-31 | 2018-12-11 | SZ DJI Technology Co., Ltd. | Correction of motion-based inaccuracy in point clouds |
| US10641875B2 (en) | 2017-08-31 | 2020-05-05 | SZ DJI Technology Co., Ltd. | Delay time calibration of optical distance measurement devices, and associated systems and methods |
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