CN203243282U - Self-adaptive amplifying circuit - Google Patents
Self-adaptive amplifying circuit Download PDFInfo
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- CN203243282U CN203243282U CN 201320056790 CN201320056790U CN203243282U CN 203243282 U CN203243282 U CN 203243282U CN 201320056790 CN201320056790 CN 201320056790 CN 201320056790 U CN201320056790 U CN 201320056790U CN 203243282 U CN203243282 U CN 203243282U
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Abstract
The utility model provides a self-adaptive amplifying circuit which comprises an amplifying unit and a compensation unit, wherein the amplifying unit contains a signal input end, and compensation signals are superposed with input signals at the input end of the amplifying unit and are used for compensating the attenuation parts of the input signals. Concretely, the amplifying unit of the self-adaptive amplifying circuit is achieved through a triode transistor, and the amplifying unit further comprises a biasing circuit. According to the self-adaptive amplifying circuit, an RC series integral circuit is additionally arranged at the input end of the amplifying circuit, voltage signals which change along with time are imposed on the input end of the amplifying circuit in the capacitor charging process, the attenuation parts of the input signals are compensated in the mode that the bias voltage of the amplifying unit is changed, and a simple hardware circuit compensates and amplifies the signals which attenuate along with time. The self-adaptive amplifying circuit is applied to fish detectors, and the requirements for signal processing of chips of the fish detectors are lowered. Moreover, due to the fact that the signals are compensated in a hardware form, circuit performance is stable.
Description
Technical field
The utility model belongs to consumer applying electronic field, relates to a kind of self adaptation amplifying circuit that is mainly used in fish detector.
Background technology
In electronic technology field, the amplifying circuit of based semiconductor amplifier is used very general.Usually, for different engineering problem the time, can use different amplifying circuits.Need in the engineering problem that signal amplifies numerous, it is that signal is time dependent that a class is arranged, and this variation is not normally wished to exist, adopting simple linear amplifier to process problems will exert an influence to the result who produces.
Such as the ultrasonic wave fish detector of at present application and field of consumer electronics, its operation principle is that equipment is launched ultrasonic wave towards the zone that is detected, and will fire back when ultrasonic wave runs into the shoal of fish.In order to distinguish the big or small of the shoal of fish and whether to be that other barrier has reflected ultrasonic wave, also need echo-signal is handled as follows: at 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 amplifying is analyzed, drawn the parameters such as size, orientation and distance of the shoal of fish.Wherein the size of the shoal of fish is one of important goal information of surveying, can embody by the intensity of echo-signal, be specially the larger echo-signal of the shoal of fish stronger, otherwise echo-signal is more weak.But ultrasonic wave is the meeting Natural Attenuation in the process of propagating, and 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.Curve L1 is depicted as that fish detector receives the time of ultrasonic echo and the echo that receives converts relation between the intensity of the signal of telecommunication among Fig. 3, since the intensity of the intensity of the described signal of telecommunication and ultrasonic echo one by one the time corresponding and the reception ultrasonic echo corresponding one by one with the distance of ultrasonic transmission, so this curve also can be used for representing ultrasonic propagation apart from and signal strength signal intensity between relation.Specifically, suppose that the ultrasonic propagation distance is far away in the certain situation of other conditions such as size of barrier, echo-signal is just more weak.This echo-signal is processed size and the far and near relation that to judge the shoal of fish according to the intensity of signal if adopt conventional linear amplifier.
Existing fish detector product has proposed kinds of schemes for addressing the above problem.Such as based on ultrasonic propagation distance and propagation time relation and the measurable theory of signal attenuation degree are arranged, some products have adopted the stronger processor chips of function, by the signal combination signal emission that records and the time information that receives are processed, calculate the pad value of echo-signal under propagation distance impact, and according to result of calculation echo-signal is compensated to eliminate propagation distance information in the echo-signal.The shortcoming of this scheme is to the having relatively high expectations of processor, and adopts the mode of software computing easily to be subjected to the factor affecting such as electromagnetism and temperature.Another kind of solution below is provided: this scheme is a kind of fish deteclor with the ultrasonic echo amplifying circuit, its amplifying circuit only amplifies for the ultrasound echo signal of certain strength, receive the ultrasonic wave realization to the detection of specific region by repeatedly sending out, resolution for object under test nearby is relatively poor, that is to say that the scope of single measurement is little.Further analysis can be found out, adopts this equipment will survey same zone and expects that also obtaining same result will need more step and longer time, and 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.
The utility model content
The utility model problems such as high and/or range of application is little to the equipment cost that exists for the treatment circuit of the echo-signal of similar ultrasonic wave fish detector in the prior art have proposed a kind of self adaptation amplifying circuit.
The technical solution of the utility model 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 to amplifying unit input offset signal, described compensating signal is superimposed at input and the input signal of amplifying unit, is used for the decay part of compensated input signal.
Concrete, the amplifying unit of above-mentioned self adaptation amplifying circuit 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 the power supply;
Emitter resistance is connected between transistor emitter and the ground;
Base bias resistance comprises the first resistance and the second resistance, and the first resistance is connected between compensating unit output and the transistor base stage, and the second resistance is connected between transistor base stage and the 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 are 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 that begins simultaneously with supply voltage.
The beneficial effects of the utility model are: the utility model adds RC series connection integrating circuit by the input at amplifying circuit, and time dependent voltage signal in the capacitor charging process is applied to the input of amplifying unit, compensate with the mode of the bias voltage that the changes amplifying unit part to attenuated input signal, realized that simple hardware circuit amplifies the in time compensation of the signal of decay; And in the utility model, also provide a kind of fish detector that adopts sort circuit, make this fish detector reduce the requirement of the chip that signal is processed, for the cost control of fish detector product provides possibility, and example, in hardware realizes that the function of signal compensation makes circuit performance more stable.
Description of drawings
Fig. 1 is the theory diagram of self adaptation amplifying circuit of the present utility model;
Fig. 2 is an embodiment schematic diagram of self adaptation amplifying circuit of the present utility model;
Fig. 3 is the signal compensation schematic diagram of self adaptation amplifying circuit of the present utility model;
Fig. 4 is the enabling signal diagram of self adaptation amplifying circuit of the present utility model;
Fig. 5 is self adaptation amplifying circuit theory diagram of the present utility model;
Fig. 6 is an embodiment schematic diagram of self adaptation amplifying circuit of the present utility model.
Embodiment
Below in conjunction with the drawings and specific embodiments the utility model is done further detailed description.
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 to amplifying unit input offset signal, and compensating signal is superimposed at input and the input signal of amplifying unit, is used for the decay part of compensated input signal.Here the superimposed stacked system of the compensating signal of indication and input signal is not limited to certain mode, such as can be direct stack, also can be to superpose 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 by transistor T1 realization, and this amplifying unit also comprises biasing circuit, and described biasing circuit comprises:
Collector resistance R5 is connected between transistor T1 collector electrode and the power supply IO1;
Emitter resistance R7 is connected between transistor T1 emitter and the ground;
Base bias resistance comprises that the first resistance R 3 and the second resistance R 6, the first resistance R 3 are connected between compensating unit output and the transistor T1 base stage, and the second resistance R 6 is connected between transistor T1 base stage and the ground.Wherein, the signal amplifying part of circuit is divided into basic triode total radio amplifier.
In above two embodiment, respectively concrete form of implementation has been proposed the amplifying unit in whole circuit and the circuit, the present embodiment will be take above-mentioned arbitrary embodiment as the basis, further a kind of specific implementation is proposed 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, the 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, be used for start-up circuit and provide power supply for circuit, be not difficult to find out, voltage in the output output of the integrating circuit of the present embodiment uprises in time gradually, the part that its change curve can be begun constantly by the t1 of the L2 curve among Fig. 3 represents, needs only the value that current-limiting resistance R1 and storage capacitor C1 rationally are set, and the part that just input signal is decayed in time obtains effective compensation.
Further, the circuit structure of the specific implementation of the compensating unit that the present embodiment maintenance is above-mentioned is constant, only increase start unit at compensating 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 that begins simultaneously with supply voltage, namely IO2 is high level when supply voltage IO1 begins as high level, and becoming high-impedance state at IO2 subsequently, IO1 still keeps high level state with holding circuit work.Can realize the amplifying signal for the treatment of of the utility model indication is carried out effective compensation by the scheme that adopts the present embodiment, below in conjunction with Fig. 3 the concrete principle of the present embodiment is described further, among the figure:
Curve L1 represents the amplifying signal for the treatment of of the utility model indication, 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 the slope sudden change at moment t1, wherein the 0-t1 time period is that IO1 and IO2 act on lower change curve simultaneously, from t1 begin backward for IO2 be change curve under the high-impedance state;
Curve L3 is the resultant curve of curve L1 and curve L2, namely to the curve after the input signal compensation;
The t1-tn time period is that the purpose that increases start unit in the present embodiment just is to make circuit can enter linear amplification region within the shorter time in the situation that consideration amplifying unit itself exists saturation region and cut-off region setting-out line amplification region among the figure.
Below be the improvement project that proposes for the stability that further increases circuit, wherein the circuit main body remains unchanged, and amplifying unit comprises the emitter-base bandgap grading shunt capacitance, is connected between the emitter and ground of transistor, is used for improving circuit and exchanges multiplication factor; Compensating unit comprises filter capacitor, and described filter capacitor is in parallel with storage capacitor, is used for the 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 the collector resistance, and described filter capacitor is connected between the common port and ground of filter resistance and collector resistance.
As shown in Figure 5, a kind of fish detector that uses above-mentioned self adaptation amplifying circuit of the present embodiment, comprise signal amplification circuit, described signal amplification circuit comprises three utmost point amplifying unit and bias units of prime amplifying unit, intermediate amplifying unit and rear utmost point amplifying unit, the prime amplifying unit comprises the self adaptation amplifying circuit, middle rank amplifying unit and rear utmost point amplifying unit realized by linear amplifier circuit, and bias unit is used to amplifying unit that bias voltage is provided.
As shown in Figure 6, in another concrete form of a kind of fish detector, intermediate amplifying unit and rear utmost point 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, there is not the quiescent point skew that causes because of coupling before and after it between the level, helpful for Systems balanth, and this circuit framework is preferably to be realized by discrete device, compare and select special chip, more be conducive to reduce circuit cost.Adopt the cumulative mode of bias voltage integration to realize resolution to object distance to be measured, software is realized simpler, and algorithm is more efficient, has reduced the difficulty of software development and for the requirement of all the other module performances of system.Described three grades of total radio amplifier unit all are coupled by electric capacity, guarantee that the quiescent point between the front and back is independent, the interference before and after getting rid of between the level.Bias unit is setovered for collector electrode in the three-stage amplifier and base stage, wherein for the biasing of preamplifying circuit base stage, form by RC integrating circuit, this voltage in time and linear increasing, its, length equated with ultrasonic echo time span to be measured pressure rising time.
The below is further described the specific works process of the scheme of embodiment of the present utility model, gathered constantly at ultrasonic echo and to be risen, bias unit charges to the storage capacitor C1 of RC integrating circuit, IO2 enters high-impedance state subsequently, IO1 continues this electric capacity is charged, and therefore, the base bias voltage of preamplifying circuit is positive slope to be increased, this signal enters three-stage amplifier after superposeing with ultrasound echo signal.Ultrasound echo signal intensity is far and near relevant, nearer then stronger, far away then more weak with testee.
Being characterized as of the output voltage signal of preamplifying circuit wherein: in the incipient stage, ultrasound echo signal is stronger, preamplifying circuit is operated in the saturation region, required base bias voltage is lower, follow the increase of time, ultrasound echo signal weakens, and amplifying circuit needs higher base bias voltage, just can be operated in the amplification region, and then input signal is amplified output.
The output signal of three-stage amplifier through behind the integrating circuit integration, through the Chip Microcomputer A/D port processing and carry out analog-to-digital conversion, 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 in order to help reader understanding's principle of the present utility model, should to be understood to that protection range of the present utility model is not limited to such special statement and embodiment.Those of ordinary skill in the art can make various other various concrete distortion and combinations that do not break away from the utility model essence according to disclosed these technology enlightenments of the utility model, and these distortion and combination are still in protection range of the present utility model.
Claims (8)
1. 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 the power supply of outside, and output is used for to amplifying unit input offset signal, described compensating signal is superimposed at input and the input signal of amplifying unit, is used for the decay part of compensated input signal.
2. a kind of self adaptation amplifying circuit according to claim 1, 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 the power supply;
Emitter resistance is connected between transistor emitter and the ground;
Base bias resistance comprises the first resistance and the second resistance, and the first resistance is connected between compensating unit output and the transistor base stage, and the second resistance is connected between transistor base stage and the ground.
3. a kind of self adaptation amplifying circuit according to claim 2, the biasing circuit of above-mentioned amplifying unit also comprises filter circuit, described filter circuit comprises filter capacitor and filter resistance, described filter resistance is connected between power supply and the collector resistance, and described filter capacitor is connected between the common port and ground of filter resistance and collector resistance.
4. 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.
5. a kind of self adaptation amplifying circuit according to claim 4, described compensating unit also comprises filter capacitor, described filter capacitor is in parallel with storage capacitor.
6. according to claim 1 or 4 described a kind of self adaptation amplifying circuits, 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.
7. a kind of self adaptation amplifying circuit according to claim 6, described compensating unit also comprises enabling signal, described enabling signal is a pulse signal that begins simultaneously with supply voltage that is provided by starting resistor.
8. according to claim 2 or 4 described a kind of self adaptation amplifying circuits, described amplifying unit comprises the emitter-base bandgap grading shunt capacitance, and described emitter-base bandgap grading shunt capacitance is connected between the emitter and ground of transistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320056790 CN203243282U (en) | 2013-02-01 | 2013-02-01 | Self-adaptive amplifying circuit |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN 201320056790 CN203243282U (en) | 2013-02-01 | 2013-02-01 | Self-adaptive amplifying circuit |
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| CN203243282U true CN203243282U (en) | 2013-10-16 |
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| CN 201320056790 Withdrawn - After Issue CN203243282U (en) | 2013-02-01 | 2013-02-01 | Self-adaptive amplifying circuit |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151988A (en) * | 2013-02-01 | 2013-06-12 | 四川虹视显示技术有限公司 | Self-adaptive amplifying circuit and fish detector based thereon |
-
2013
- 2013-02-01 CN CN 201320056790 patent/CN203243282U/en not_active Withdrawn - After Issue
Cited By (2)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103151988A (en) * | 2013-02-01 | 2013-06-12 | 四川虹视显示技术有限公司 | Self-adaptive amplifying circuit and fish detector based thereon |
| CN103151988B (en) * | 2013-02-01 | 2015-12-23 | 四川虹视显示技术有限公司 | Self adaptation amplifying circuit and the fish detector based on this circuit |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| AV01 | Patent right actively abandoned |
Granted publication date: 20131016 Effective date of abandoning: 20151223 |
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| C25 | Abandonment of patent right or utility model to avoid double patenting |