CN103151988B - Self adaptation amplifying circuit and the fish detector based on this circuit - Google Patents
Self adaptation amplifying circuit and the fish detector based on this circuit Download PDFInfo
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- CN103151988B CN103151988B CN201310039318.6A CN201310039318A CN103151988B CN 103151988 B CN103151988 B CN 103151988B CN 201310039318 A CN201310039318 A CN 201310039318A CN 103151988 B CN103151988 B CN 103151988B
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Abstract
Self adaptation amplifying circuit of the present invention comprises an amplifying unit containing signal input part, and comprises compensating unit, compensating signal the input of amplifying unit and input signal superimposed, for the attenuation portions of compensated input signal.Concrete, the amplifying unit of self adaptation amplifying circuit is realized by transistor, and amplifying unit also comprises biasing circuit.This by adding a RC series connection integrating circuit at the input of amplifying circuit, and voltage signal time dependent in capacitor charging process is applied to the input of amplifying unit, compensate with the part of mode to attenuated input signal changing the bias voltage of amplifying unit, achieve simple hardware circuit and the compensation of the signal of decaying in time is amplified; And additionally provide a kind of fish detector adopting this circuit in the present invention, make the requirement of this fish detector reduction to the chip of signal transacting, and the function that example, in hardware realizes signal compensation makes circuit performance more stable.
Description
Technical field
The invention belongs to consumer applying electronic field, relate to a kind of self adaptation amplifying circuit and the fish detector based on this self adaptation amplifying circuit.
Background technology
In electronic technology field, the amplifying circuit application of based semiconductor amplifier is very general.Usually, different amplifying circuits can be used for during different engineering problems.In numerous engineering problems needing signal to amplify, it is time dependent for having a class to be signal, and existence is not normally wished in this change, adopts simple linear amplifier process problems will have an impact to the result produced.
Such as the ultrasonic fish finer of at present application and field of consumer electronics, its operation principle be equipment towards the field emission ultrasonic wave be detected, will fire back when ultrasonic wave runs into the shoal of fish.In order to the size of the shoal of fish can be distinguished and whether be that other barrier reflects ultrasonic wave, also need to be handled as follows echo-signal: first echo-signal is converted into the signal of telecommunication, by amplifying circuit, the signal of telecommunication is amplified again, then by control unit, the signal after amplification is analyzed, draw the parameters such as the size of the shoal of fish, orientation and distance.Wherein the size of the shoal of fish is one of important goal information of detection, can be embodied, be specially the larger echo-signal of the shoal of fish stronger, otherwise echo-signal is more weak by the intensity of echo-signal.But ultrasonic wave is meeting Natural Attenuation in the process propagated, along with propagation distance is far away, decay can be more severe.Be understood that, the distance of the shoal of fish also can have influence on the power of echo-signal.The time that in Fig. 3, curve L1 is depicted as fish detector reception ultrasonic echo and the echo received convert the relation between the intensity of the signal of telecommunication to, due to the intensity of the described signal of telecommunication and the intensity one_to_one corresponding of ultrasonic echo and receive the time of ultrasonic echo and the distance one_to_one corresponding of ultrasonic transmission, therefore this curve also can be used for representing the relation between ultrasonic propagation distance and signal strength signal intensity.Specifically, assuming that when other conditions such as the size of barrier are certain, ultrasonic propagation distance is far away, and echo-signal is more weak.If adopt conventional linear amplifier this echo-signal to be processed to size and the distant relationships that cannot judge the shoal of fish according to the intensity of signal.
Existing fish detector product proposes kinds of schemes for solving the problem.Such as have relation based on ultrasonic propagation distance and propagation time and the measurable theory of signal attenuation degree, some products have employed the stronger processor chips of function, processed by the time information launched the signal combination signal recorded and receive, calculate the pad value of echo-signal under propagation distance impact, and according to result of calculation, echo-signal is compensated to the propagation distance information eliminated in echo-signal.The shortcoming of this scheme is higher to the requirement of processor, and adopts the mode of software computing easily to affect by the factor such as electromagnetism and temperature.Below provide another kind of solution: the program is a kind of fish deteclor with ultrasonic echo amplifying circuit, its amplifying circuit only amplifies for the ultrasound echo signal of certain strength, the detection of ultrasonic wave realization to specific region is received by repeatedly sending out, resolution for object under test is nearby poor, and that is the scope of single measurement is little.Further analysis can be found out, adopt this equipment will detect same region and expect to obtain same result by the more step of needs and longer time, for this self-powered equipment of fish detector, the capacity of battery will be a challenge.And this kind equipment mostly is integrated circuit, therefore cost is higher.
Summary of the invention
The problem such as the high and/or range of application of the equipment cost that the present invention exists the treatment circuit of the echo-signal for ultrasonic fish finer similar in prior art is little, proposes a kind of self adaptation amplifying circuit and a kind of fish detector based on this circuit.
Technical scheme of the present invention is: a kind of self adaptation amplifying circuit, comprise amplifying unit, described amplifying unit comprises signal input part, characterized by further comprising compensating unit, described compensating unit comprises input and output, and the input of described compensating unit is connected with power supply, and output is used for amplifying unit input offset signal, described compensating signal the input of amplifying unit and input signal superimposed, for the attenuation portions of compensated input signal.
Concrete, the amplifying unit of above-mentioned self adaptation amplifying circuit is realized by transistor, and described amplifying unit also comprises biasing circuit, and described biasing circuit comprises:
Collector resistance, is connected between transistor collector electrode and power supply;
Emitter resistance, is connected between transistor emitter and ground;
Base bias resistance, comprises the first resistance and the second resistance, and the first resistance is connected between compensating unit output and transistor base stage, and the second resistance is connected between transistor base stage and ground.
Further, above-mentioned compensating unit is realized by RC series connection integrating circuit, comprise current-limiting resistance and storage capacitor, it is characterized in that described current-limiting resistance one end is connected with power supply, the other end is connected with storage capacitor, storage capacitor other end ground connection, the common port of storage capacitor and current-limiting resistance is the output of compensating unit.
Further, above-mentioned compensating unit also comprises start unit, and described start unit comprises a start unit current-limiting resistance, and described start unit current-limiting resistance one end is connected with starting resistor, and the other end is connected with the output of compensating unit.
Above-mentioned compensating unit also comprises enabling signal, and described enabling signal is provided by starting resistor, is a pulse signal simultaneously started with supply voltage.
A kind of fish detector using above-mentioned self adaptation amplifying circuit, it is characterized in that comprising signal amplification circuit, described signal amplification circuit comprises three pole amplifying unit and bias units of prime amplifying unit, intermediate amplifying unit and rear pole amplifying unit, described prime amplifying unit comprises described self adaptation amplifying circuit, described intermediate amplifying unit and rear pole amplifying unit are realized by linear amplifier circuit, and described bias unit is used for providing bias voltage for amplifying unit at different levels.
Concrete, above-mentioned intermediate amplifying unit and rear pole amplifying unit are realized by transistor common emitter amplifying circuit, adopt capacity coupled mode to connect between each amplifying unit.
Beneficial effect of the present invention is: the present invention is by adding a RC series connection integrating circuit at the input of amplifying circuit, and voltage signal time dependent in capacitor charging process is applied to the input of amplifying unit, compensate with the part of mode to attenuated input signal changing the bias voltage of amplifying unit, achieve simple hardware circuit and the compensation of the signal of decaying in time is amplified; And additionally provide a kind of fish detector adopting this circuit in the present invention, make the requirement of this fish detector reduction to the chip of signal transacting, for the cost control of fish detector product provides possibility, and the function that example, in hardware realizes signal compensation makes circuit performance more stable.
Accompanying drawing explanation
Fig. 1 is the theory diagram of self adaptation amplifying circuit of the present invention;
Fig. 2 is an embodiment schematic diagram of self adaptation amplifying circuit of the present invention;
Fig. 3 is the signal compensation schematic diagram of self adaptation amplifying circuit of the present invention;
Fig. 4 is the enabling signal diagram of self adaptation amplifying circuit of the present invention;
Fig. 5 is the amplifying circuit theory diagram of fish detector of the present invention;
Fig. 6 is an embodiment schematic diagram of the amplifying circuit of fish detector of the present invention.
Embodiment
Below in conjunction with the drawings and specific embodiments, the present invention is described in further detail.
As shown in Figure 1, a kind of self adaptation amplifying circuit of the present embodiment comprises amplifying unit and compensating unit, wherein amplifying unit comprises signal input part, compensating unit comprises input and output, the input of compensating unit is connected with power supply, output is used for amplifying unit input offset signal, and compensating signal the input of amplifying unit and input signal superimposed, for the attenuation portions of compensated input signal.Here the compensating signal of indication and the superimposed stacked system of input signal are not limited to certain mode, such as can be direct superpositions, also can be superposed by various coupled modes.
As shown in Figure 2, as another concrete form of a upper embodiment, in the present embodiment, the amplifying unit of self adaptation amplifying circuit is realized by transistor T1, and this amplifying unit also comprises biasing circuit, and described biasing circuit comprises:
Collector resistance R5, is connected between transistor T1 collector electrode and power supply IO1;
Emitter resistance R7, is connected between transistor T1 emitter and ground;
Base bias resistance, comprises the first resistance R3 and the second resistance R6, and the first resistance R3 is connected between compensating unit output and transistor T1 base stage, and the second resistance R6 is connected between transistor T1 base stage and ground.Wherein, the signal amplifying part of circuit is divided into basic triode total radio amplifier.
In above two embodiments, respectively concrete form of implementation is proposed to the amplifying unit in whole circuit and circuit, the present embodiment is by based on above-mentioned any embodiment, further a kind of specific implementation is proposed to compensating unit, compensating unit in the present embodiment is realized by RC series connection integrating circuit, comprise current-limiting resistance R1 and storage capacitor C1, one end of current-limiting resistance R1 is connected with power supply IO1, the other end is connected with storage capacitor C1, storage capacitor C1 other end ground connection, the common port of storage capacitor C1 and current-limiting resistance R1 is the output of compensating unit.In the present embodiment, power supply IO1 is DC power supply, power supply is provided for start-up circuit and for circuit, be not difficult to find out, the voltage exported at the output of the integrating circuit of the present embodiment uprises in time gradually, its change curve can the part by the t1 moment of the L2 curve in Fig. 3 represent, as long as rationally arrange the value of current-limiting resistance R1 and storage capacitor C1, the part that just input signal can be made to decay in time obtains effective compensation.
Further, the present embodiment keeps the circuit structure of the specific implementation of above-mentioned compensating unit constant, only on compensating unit, increase start unit, this start unit comprises a start unit current-limiting resistance R2, described start unit current-limiting resistance R2 one end is connected with starting resistor IO2, and the other end is connected with the output of compensating unit.This compensating unit also comprises enabling signal, as shown in Figure 4, described enabling signal is provided by starting resistor IO2, it is a pulse signal simultaneously started with supply voltage, namely start as IO2 during high level is high level at supply voltage IO1, and becoming high-impedance state at IO2 subsequently, IO1 still keeps high level state with holding circuit work.By adopting the scheme of the present embodiment can realize carrying out effective compensation to the signal to be amplified of indication of the present invention, below in conjunction with Fig. 3, the concrete principle of the present embodiment is described further, in figure:
Curve L1 represents the signal to be amplified of indication of the present invention, and this signal is decayed in time;
Curve L2 represents that the compensating circuit of the present embodiment acts on the signal of the input of amplifying circuit, this curve goes out slope sudden change at moment t1, wherein the 0-t1 time period is that IO1 and IO2 acts on lower change curve simultaneously, from t1 start backward for IO2 be high-impedance state under change curve;
Curve L3 is the resultant curve of curve L1 and curve L2, the curve after namely compensating input signal;
In figure, the t1-tn time period is the setting-out line amplification region when considering that amplifying unit itself exists saturation region and cut-off region, and the object increasing start unit in the present embodiment is just to make circuit can enter linear amplification region within the shorter time.
Be below the improvement project that the stability in order to increase circuit further proposes, wherein circuit main body remains unchanged, and amplifying unit comprises emitter bypass electric capacity, is connected between the emitter of transistor and ground, for improving circuit AC multiplication factor; Compensating unit comprises filter capacitor, and described filter capacitor is in parallel with storage capacitor, for filtered signal clutter; The biasing circuit of amplifying unit comprises filter circuit, described filter circuit comprises filter capacitor and filter resistance, described filter resistance is connected between power supply and collector resistance, between the common port that described filter capacitor is connected to filter resistance and collector resistance and ground.
As shown in Figure 5, a kind of fish detector using above-mentioned self adaptation amplifying circuit of the present embodiment, comprise signal amplification circuit, described signal amplification circuit comprises three pole amplifying unit and bias units of prime amplifying unit, intermediate amplifying unit and rear pole amplifying unit, prime amplifying unit comprises self adaptation amplifying circuit, middle rank amplifying unit and rear pole amplifying unit are realized by linear amplifier circuit, and bias unit is used for providing bias voltage for amplifying unit.
As shown in Figure 6, in another concrete form of a kind of fish detector, intermediate amplifying unit and rear pole amplifying unit are realized by transistor common emitter amplifying circuit, adopt capacity coupled mode to connect between each amplifying unit.The present embodiment three-stage amplifier adopts capacity coupled mode, the quiescent point skew caused because being coupled is there is not between its front stage, stability for system is helpful, and this circuit framework is preferably is realized by discrete device, compare and select special chip, be more conducive to reducing circuit cost.The mode adopting bias voltage integration to add up achieves the resolution of measuring targets distance, and software simulating is simpler, and algorithm is more efficient, reduces the difficulty of software development and the requirement for all the other module performances of system.Three grades of described total radio amplifier unit are all coupled by electric capacity, and the quiescent point between before and after guaranteeing is independent, get rid of the interference between front stage.Bias unit is biased for collector electrode in three-stage amplifier and base stage, being biased wherein for preamplifying circuit base stage, by RC integrating circuit composition, this voltage increases in time and linearly, and its, length was equal with ultrasonic echo time span to be measured pressure rising time.
Below the specific works process of the scheme of embodiments of the invention is further described, rise in the ultrasonic echo collected moment, the storage capacitor C1 of bias unit to RC integrating circuit charges, IO2 enters high-impedance state subsequently, IO1 continues to charge to this electric capacity, and therefore, the base bias voltage of preamplifying circuit is that positive slope increases, this signal, after superposing with ultrasound echo signal, enters three-stage amplifier.Ultrasound echo signal intensity is far and near relevant, nearer then stronger, far away then more weak to testee.
Wherein the feature of the output voltage signal of preamplifying circuit is: in the most incipient stage, ultrasound echo signal is stronger, preamplifying circuit is operated in saturation region, required base bias voltage is lower, with the increase of time, ultrasound echo signal weakens, and amplifying circuit needs higher base bias voltage, just can be operated in amplification region, and then input signal is amplified output.
The output signal of three-stage amplifier, after integrating circuit integration, carries out analog-to-digital conversion through Chip Microcomputer A/D port processing, can calculate distance and the size of testee, such as the size of the shoal of fish.
Those of ordinary skill in the art will appreciate that, embodiment described here is to help reader understanding's principle of the present invention, should be understood to that protection scope of the present invention is not limited to so special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combination of not departing from essence of the present invention according to these technology enlightenment disclosed by the invention, and these distortion and combination are still in protection scope of the present invention.
Claims (6)
1. a self adaptation amplifying circuit, comprise amplifying unit, described amplifying unit comprises signal input part, characterized by further comprising compensating unit, described compensating unit comprises input and output, and the input of described compensating unit is connected with outside power supply, and output is used for amplifying unit input offset signal, described compensating signal the input of amplifying unit and input signal superimposed, for the attenuation portions of compensated input signal;
Described amplifying unit comprises transistor and biasing circuit, and the base stage of transistor is as signal input part, and wherein, biasing circuit comprises:
Collector resistance, is connected between transistor collector electrode and power supply;
Emitter resistance, is connected between transistor emitter and ground;
Base bias resistance, comprises the first resistance and the second resistance, and the first resistance is connected between compensating unit output and transistor base stage, and the second resistance is connected between transistor base stage and ground;
Filter circuit, described filter circuit comprises filter capacitor and filter resistance, and described filter resistance is connected between power supply and collector resistance, between the common port that described filter capacitor is connected to filter resistance and collector resistance and ground.
2. a kind of self adaptation amplifying circuit according to claim 1, it is characterized in that, described compensating unit is realized by RC series connection integrating circuit, comprise current-limiting resistance and storage capacitor, described current-limiting resistance one end is connected with power supply, the other end is connected with storage capacitor, storage capacitor other end ground connection, and the common port of storage capacitor and current-limiting resistance is the output of compensating unit.
3. a kind of self adaptation amplifying circuit according to claim 2, described compensating unit also comprises filter capacitor, and described filter capacitor is in parallel with storage capacitor.
4. a kind of self adaptation amplifying circuit according to claim 1 and 2, described compensating unit also comprises start unit, described start unit comprises a start unit current-limiting resistance, and described start unit current-limiting resistance one end is connected with starting resistor, and the other end is connected with the output of compensating unit.
5. a kind of self adaptation amplifying circuit according to claim 4, described compensating unit also comprises enabling signal, described enabling signal be provided by starting resistor with supply voltage simultaneously a pulse signal.
6. a kind of self adaptation amplifying circuit according to claim 1 and 2, described amplifying unit comprises emitter bypass electric capacity, and described emitter bypass electric capacity is connected between the emitter of transistor and ground.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310039318.6A CN103151988B (en) | 2013-02-01 | 2013-02-01 | Self adaptation amplifying circuit and the fish detector based on this circuit |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201310039318.6A CN103151988B (en) | 2013-02-01 | 2013-02-01 | Self adaptation amplifying circuit and the fish detector based on this circuit |
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| CN103151988A CN103151988A (en) | 2013-06-12 |
| CN103151988B true CN103151988B (en) | 2015-12-23 |
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| CN201310039318.6A Expired - Fee Related CN103151988B (en) | 2013-02-01 | 2013-02-01 | Self adaptation amplifying circuit and the fish detector based on this circuit |
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Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
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| CN103885360B (en) * | 2014-03-07 | 2016-04-20 | 宁波成电泰克电子信息技术发展有限公司 | A kind of wireless fish deteclor circuit based on bluetooth |
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| CN201387487Y (en) * | 2009-03-23 | 2010-01-20 | 山东交通职业学院 | Receiver circuit of laser distance meter |
| CN102255610A (en) * | 2010-05-20 | 2011-11-23 | 鸿富锦精密工业（深圳）有限公司 | Signal filtering circuit with compensating property |
| CN203243282U (en) * | 2013-02-01 | 2013-10-16 | 四川虹视显示技术有限公司 | Self-adaptive amplifying circuit |
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2013
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Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN1250250A (en) * | 1998-09-02 | 2000-04-12 | 富士通株式会社 | Predistorter of amplifier and amplifier unit |
| CN201387487Y (en) * | 2009-03-23 | 2010-01-20 | 山东交通职业学院 | Receiver circuit of laser distance meter |
| CN102255610A (en) * | 2010-05-20 | 2011-11-23 | 鸿富锦精密工业（深圳）有限公司 | Signal filtering circuit with compensating property |
| CN203243282U (en) * | 2013-02-01 | 2013-10-16 | 四川虹视显示技术有限公司 | Self-adaptive amplifying circuit |
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