CN102427338B - Signal amplifier capable of automatically changing input impedance and implementation method thereof - Google Patents
Signal amplifier capable of automatically changing input impedance and implementation method thereof Download PDFInfo
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- CN102427338B CN102427338B CN201110287583.7A CN201110287583A CN102427338B CN 102427338 B CN102427338 B CN 102427338B CN 201110287583 A CN201110287583 A CN 201110287583A CN 102427338 B CN102427338 B CN 102427338B
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Abstract
The invention discloses a signal amplifier capable of automatically changing input impedance and an implementation method thereof. The signal amplifier comprises a signal input end, an amplifying circuit, a signal output end, a reference voltage module, a signal detection module, a variable impedance control module and a compensation module, wherein the signal output end is electrically connected with the amplifying circuit; the reference voltage module is used for providing reference voltage; the signal detection module is used for detecting an input signal in real time, comparing with the reference voltage and then controlling magnitude change of the input impedance according to signal strength; the variable impedance control module is used for controlling magnitude of the input impedance; and the compensation module is used for generating a compensation signal to compensate the amplifying circuit. By using the signal amplifier, the technical indexes such as sensitivity, signal-noise ratio and the like of the signal amplifier can be effectively increased, the application range of the signal amplifier is expanded, and the performance of the amplifier and the application field level of the corresponding sensor are greatly improved.
Description
Technical field
The present invention relates to design of integrated circuit field, particularly relate to a kind of adopt auto-changing input impedance to design signal amplifier and its implementation.
Background technology
At present, in various sensor field, very high to the performance requirement of the preamplifier of signal, especially more harsh to the index request such as sensitivity and signal to noise ratio of amplifier, and these two indexs have with the input impedance of amplifier and directly contact.There is the drawback can not taken into account at two in the past fixing input impedance design, if impedance is large, there will be obstruction when large-signal is come; If impedance is little, then the problem such as there will be that signal equivalent attenuation is large, sensitivity decrease, working point are higher.
Due to above-mentioned drawback, signal amplifier of the prior art can only choose the mentality of designing of the golden mean of the Confucian school, to find balance point, therefore reduces the range of application of signal amplifier.
Summary of the invention
The object of the invention is to, signal amplifier and its implementation of a kind of auto-changing input impedance are provided, it effectively can improve the technical indicators such as the sensitivity of signal amplifier and signal to noise ratio, drastically increases the performance of amplifier and the application level of corresponding transducer.
For achieving the above object, the invention provides a kind of signal amplifier of auto-changing input impedance, comprising: signal input part, amplifying circuit and the signal output part be electrically connected with amplifying circuit, it also comprises:
Reference voltage module, for providing reference voltage;
Signal detection module, for detecting real-time input signal, and according to the size conversion of the strong and weak control inputs impedance of signal after comparing with reference voltage;
Variableimpedance control module, for the size of control inputs impedance;
Compensating module, compensates amplifying circuit for generation of compensating signal.
In the present invention, described reference voltage module one end and amplifying circuit are electrically connected, and the other end and signal detection module are electrically connected; Signal detection module is also electrically connected with signal input part, variableimpedance control module and compensating module respectively; Variableimpedance control module one end and signal input part are electrically connected, and the other end and amplifying circuit are electrically connected; Compensating circuit is also electrically connected with amplifying circuit.
Described reference voltage module is a subthreshold value band gap reference.
Described signal detection module is used for detecting real-time input signal, and reference voltage is carried out array classification, and produces two corresponding control signal correspondences and control variableimpedance control module and compensating module.
Described variableimpedance control module is the dynamically changeable electric resistance array by signal detection module controls; Described compensating module is the Dynamic Signal by signal detection module controls, and it compensates for carrying out fine setting to amplifying circuit.
Further, the present invention also provides a kind of signal amplifier implementation method of auto-changing input impedance, and it comprises:
Reference voltage module provides a reference voltage;
Signal detection module detecting real-time input signal, compares input signal and reference voltage;
According to the size of input signal and reference voltage comparative result, the reduction of the corresponding control inputs impedance of variableimpedance control module or increase;
Signal detection module is compensated amplifying circuit by compensating module simultaneously.
Reference voltage module in the present invention adopts subthreshold value band gap reference to provide a reference voltage.
In signal detection module detecting real-time input signal process, reference voltage is carried out array classification by signal detection module, produces multiple component voltage, and the control signal correspondence that generation two is corresponding simultaneously controls variableimpedance module and compensating module.
Variableimpedance control module of the present invention is the dynamically changeable electric resistance array by signal detection module controls, and compensating module is the Dynamic Signal by signal detection module controls, and it compensates for carrying out fine setting to amplifying circuit.
In the described size according to input signal and reference voltage comparative result, in the reduction of the corresponding control inputs impedance of variableimpedance control module or the step of increase, if input signal is greater than reference voltage, then signal detection module controls variableimpedance control module reduces input impedance; If input signal is less than reference voltage, then signal detection module controls variableimpedance control module increases input impedance; If input signal equals reference voltage, then keep input impedance constant.
The signal amplifier of auto-changing input impedance of the present invention and its implementation, its Preamplifier for tiny signal in sensor field makes improvements, effectively can improve the technical indicator such as sensitivity and signal to noise ratio of signal amplifier, expand the range of application of signal amplifier, drastically increase the performance of amplifier and the application level of corresponding transducer.
Accompanying drawing explanation
Fig. 1 is the circuit module schematic diagram of signal amplifier one specific embodiment of auto-changing input impedance of the present invention;
Fig. 2 is the flow chart of signal amplifier implementation method one specific embodiment of auto-changing input impedance of the present invention.
Embodiment
As shown in Figure 1, the invention provides a kind of signal amplifier of auto-changing input impedance, comprising: signal input part 10, amplifying circuit 20 and the signal output part 30 be electrically connected with amplifying circuit 20.Especially, the present invention also comprises: reference voltage module 40, signal detection module 50, variableimpedance control module 60 and compensating module 70.
Wherein, reference voltage module 40 is for providing one group of reference voltage.Signal detection module 50 for detecting real-time input signal, and according to the size conversion of the strong and weak control inputs impedance of signal after comparing with reference voltage.Variableimpedance control module 60 is for the size of control inputs impedance.Compensating module 70 compensates amplifying circuit 20 for generation of compensating signal.
As a kind of specific embodiment of the present invention, described reference voltage module 40 one end and amplifying circuit 20 are electrically connected, and the other end and signal detection module 50 are electrically connected; Signal detection module 50 is also electrically connected with signal input part 10, variableimpedance control module 60 and compensating module 70 respectively; Variableimpedance control module 60 one end and signal input part 10 are electrically connected, and the other end and amplifying circuit 20 are electrically connected; Compensating circuit 70 is also electrically connected with amplifying circuit 20.
In the present invention, described reference voltage module 40 can be a built-in subthreshold value band gap reference, and it is supplied to the high-precision reference voltage of signal detection module 50 1.Reference voltage, for detecting real-time input signal, is carried out array classification by signal detection module 50, and produces two corresponding control signal correspondences and control variableimpedance control module 60 and compensating module 70.Variableimpedance control module 60 is the dynamically changeable electric resistance array controlled by signal detection module 50.Compensating module 70 is the Dynamic Signal controlled by signal detection module 50, and it compensates for carrying out fine setting to amplifying circuit 20.The present invention is by signal detection module 50 detecting real-time input signal, the size of control inputs impedance, different input impedance correspondences is by compensating balance input range by compensating module 70 pairs of amplifying circuits 20, input impedance is strengthened when can realize small-signal input with this, reduce signal attenuation, improve sensitivity, reduce input impedance during large-signal input, avoid occurring signal jam and realize the object of high s/n ratio.
Further, as shown in Figure 2, the present invention also provides a kind of signal amplifier implementation method of auto-changing input impedance, and it comprises:
Step 1, reference voltage module provides a reference voltage.As a preferred embodiment of the present invention, this reference voltage module can adopt subthreshold value band gap reference to provide a high-precision reference voltage.
Step 2, signal detection module detecting real-time input signal, compares input signal and reference voltage.Particularly, in this signal detection module detecting real-time input signal process, reference voltage is carried out array classification by signal detection module, produce multiple component voltage, can thickness according to different demand classifications, two corresponding control signal correspondences can be produced simultaneously and control variableimpedance module and compensating module.
Step 3, according to the size of input signal and reference voltage comparative result, the reduction of the corresponding control inputs impedance of variableimpedance control module or increase.Variableimpedance control module of the present invention is the dynamically changeable electric resistance array by signal detection module controls.Signal detection module detecting real-time input signal, after comparing with one group of reference voltage, according to the size conversion of the strong and weak control inputs impedance of input signal.As a kind of specific embodiment of the present invention, in this step 3, if input signal is greater than reference voltage, then signal detection module controls variableimpedance control module reduces input impedance; If input signal is less than reference voltage, then signal detection module controls variableimpedance control module increases input impedance; If input signal equals reference voltage, then keep input impedance constant.
Step 4, signal detection module is compensated amplifying circuit by compensating module simultaneously.Compensating module of the present invention is the Dynamic Signal by signal detection module controls, and it compensates for carrying out fine setting to amplifying circuit, balances and is changed the amplitude that input signal produces by variableimpedance module.This step can occur with step 3 simultaneously, namely when a signal input, after signal detection module detects, the corresponding input impedance producing a coupling in variableimpedance module, by producing a compensating signal in compensating module correspondence, amplifying circuit is compensated, after the delayed circuit of input signal, correspondence is received by different input resistances, impedance is increased when realizing small-signal input with this, reduce signal attenuation, improve sensitivity, reduce input impedance during large-signal input, avoid occurring signal jam and realize the object of high s/n ratio.
In sum, the signal amplifier of auto-changing input impedance of the present invention and its implementation, its Preamplifier for tiny signal in sensor field makes improvements, effectively can improve the technical indicator such as sensitivity and signal to noise ratio of signal amplifier, expand the range of application of signal amplifier, drastically increase the performance of amplifier and the application level of corresponding transducer.
The above; for the person of ordinary skill of the art; can make other various corresponding change and distortion according to technical scheme of the present invention and technical conceive, and all these change and be out of shape the protection range that all should belong to the accompanying claim of the present invention.
Claims (8)
1. a signal amplifier for auto-changing input impedance, the signal output part comprising signal input part, amplifying circuit and be electrically connected with amplifying circuit, is characterized in that, also comprise:
Reference voltage module, for providing reference voltage; Signal detection module, for detecting real-time input signal, and according to the size conversion of the strong and weak control inputs impedance of signal after comparing with reference voltage; Variableimpedance control module, for the size of control inputs impedance; Compensating module is the Dynamic Signal by signal detection module controls, compensates for carrying out fine setting to amplifying circuit; Reference voltage is carried out array classification by described signal detection module, and produces that two corresponding control signals are corresponding respectively controls variableimpedance control module and compensating module; Described variableimpedance control module is the dynamically changeable electric resistance array by signal detection module controls.
2. the signal amplifier of auto-changing input impedance as claimed in claim 1, it is characterized in that, described reference voltage module one end and amplifying circuit are electrically connected, and the other end and signal detection module are electrically connected; Signal detection module is also electrically connected with signal input part, variableimpedance control module and compensating module respectively; Variableimpedance control module one end and signal input part are electrically connected, and the other end and amplifying circuit are electrically connected; Compensating circuit is also electrically connected with amplifying circuit.
3. the signal amplifier of auto-changing input impedance as claimed in claim 1, it is characterized in that, described reference voltage module is a subthreshold value band gap reference.
4. a signal amplifier implementation method for the auto-changing input impedance as described in any one of claim 1-3, is characterized in that, comprising:
Reference voltage module provides a reference voltage;
Signal detection module detecting real-time input signal, compares input signal and reference voltage;
According to the size of input signal and reference voltage comparative result, the reduction of the corresponding control inputs impedance of variableimpedance control module or increase;
Signal detection module is compensated amplifying circuit by compensating module simultaneously.
5. the signal amplifier implementation method of auto-changing input impedance as claimed in claim 4, is characterized in that, described reference voltage module adopts subthreshold value band gap reference to provide a reference voltage.
6. the signal amplifier implementation method of auto-changing input impedance as claimed in claim 4, it is characterized in that, in described signal detection module detecting real-time input signal process, reference voltage is carried out array classification by signal detection module, produce multiple component voltage, the control signal that generation two is corresponding is simultaneously corresponding respectively controls variableimpedance module and compensating module.
7. the signal amplifier implementation method of auto-changing input impedance as claimed in claim 4, it is characterized in that, described variableimpedance control module is the dynamically changeable electric resistance array by signal detection module controls, compensating module is the Dynamic Signal by signal detection module controls, and it compensates for carrying out fine setting to amplifying circuit.
8. the signal amplifier implementation method of auto-changing input impedance as claimed in claim 4, it is characterized in that, the described size according to input signal and reference voltage comparative result, in the reduction of the corresponding control inputs impedance of variableimpedance control module or the step of increase, if input signal is greater than reference voltage, then signal detection module controls variableimpedance control module reduces input impedance; If input signal is less than reference voltage, then signal detection module controls variableimpedance control module increases input impedance; If input signal equals reference voltage, then keep input impedance constant.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110287583.7A CN102427338B (en) | 2011-09-26 | 2011-09-26 | Signal amplifier capable of automatically changing input impedance and implementation method thereof |
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| Application Number | Priority Date | Filing Date | Title |
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| CN201110287583.7A CN102427338B (en) | 2011-09-26 | 2011-09-26 | Signal amplifier capable of automatically changing input impedance and implementation method thereof |
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| CN102427338A CN102427338A (en) | 2012-04-25 |
| CN102427338B true CN102427338B (en) | 2015-05-20 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US6556814B1 (en) * | 1999-07-22 | 2003-04-29 | Motorola, Inc. | Memory-based amplifier load adjust system |
| CN1421073A (en) * | 2000-02-15 | 2003-05-28 | 姜仁镐 | Envelope-tracking amplifier having improved gain, terminal device for mobile communication using same, and method for improving gain relating thereto |
| CN1501578A (en) * | 2002-11-18 | 2004-06-02 | ѧУ��������ƴ�ѧУ | Signal amplifier employing DOHERTY amplifier |
| CN101282131A (en) * | 1998-03-26 | 2008-10-08 | 三菱电机株式会社 | Spread spectrum communication device and method |
| CN101796720A (en) * | 2007-09-07 | 2010-08-04 | 雷声公司 | Input circuitry for transistor power amplifier and method for designing such circuitry |
Family Cites Families (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP4184739B2 (en) * | 2002-09-17 | 2008-11-19 | 三菱電機株式会社 | High frequency power amplifier |
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2011
- 2011-09-26 CN CN201110287583.7A patent/CN102427338B/en not_active Expired - Fee Related
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101282131A (en) * | 1998-03-26 | 2008-10-08 | 三菱电机株式会社 | Spread spectrum communication device and method |
| US6556814B1 (en) * | 1999-07-22 | 2003-04-29 | Motorola, Inc. | Memory-based amplifier load adjust system |
| CN1421073A (en) * | 2000-02-15 | 2003-05-28 | 姜仁镐 | Envelope-tracking amplifier having improved gain, terminal device for mobile communication using same, and method for improving gain relating thereto |
| CN1501578A (en) * | 2002-11-18 | 2004-06-02 | ѧУ��������ƴ�ѧУ | Signal amplifier employing DOHERTY amplifier |
| CN101796720A (en) * | 2007-09-07 | 2010-08-04 | 雷声公司 | Input circuitry for transistor power amplifier and method for designing such circuitry |
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| CN102427338A (en) | 2012-04-25 |
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