CN102427338A - 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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- CN102427338A CN102427338A CN2011102875837A CN201110287583A CN102427338A CN 102427338 A CN102427338 A CN 102427338A CN 2011102875837 A CN2011102875837 A CN 2011102875837A CN 201110287583 A CN201110287583 A CN 201110287583A CN 102427338 A CN102427338 A CN 102427338A
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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 the design of integrated circuit field, relate in particular to a kind of signal amplifier and its implementation that adopts automatic conversion input impedance design.
Background technology
At present, very high in various sensor field to the performance requirement of the preamplifier of signal, the especially sensitivity of pair amplifier, and index request such as signal to noise ratio more harsh, and the input impedance of these two indexs and amplifier has directly and gets in touch.The drawback that fixing in the past input impedance design exists two not take into account if impedance is big, can occur when large-signal is come blocking; If impedance is little, problem such as can occur then that signal equivalent attenuation is big, sensitivity reduction, working point are higher.
Because above-mentioned drawback, signal amplifier of the prior art can only be chosen the mentality of designing of the golden mean of the Confucian school, to seek balance point, the range of application of therefore having dwindled signal amplifier.
Summary of the invention
The objective of the invention is to; Signal amplifier and its implementation of a kind of automatic conversion input impedance are provided; Sensitivity, and technical indicator such as signal to noise ratio that it can effectively improve signal amplifier have greatly improved the performance and the corresponding application of sensor field level of amplifier.
Be to realize above-mentioned purpose, the present invention provides a kind of signal amplifier of automatic conversion input impedance, comprising: signal input part, amplifying circuit, and with the signal output part of amplifying circuit electric connection, it also comprises:
The reference voltage module is used to provide reference voltage;
The signal detection module is used for the detecting real-time input signal, and relatively back according to the strong and weak size conversion of controlling input impedance of signal with reference voltage;
The variableimpedance control module is used to control the size of input impedance;
Compensating module is used to produce compensating signal amplifying circuit is compensated.
Among the present invention, said reference voltage module one end and amplifying circuit electrically connect, and the other end and signal detection module electrically connect; The signal detection module also respectively with signal input part, variableimpedance control module, and compensating module electrically connect; Variableimpedance control module one end and signal input part electrically connect, and the other end and amplifying circuit electrically connect; Compensating circuit also electrically connects with amplifying circuit.
Said reference voltage module is a subthreshold value band gap reference.
Said signal detection module is used for the detecting real-time input signal, and reference voltage is carried out the array classification, and produces the control signal corresponding control variableimpedance control module and the compensating module of two correspondences.
Said variableimpedance control module is the dynamically changeable electric resistance array through the signal detection module controls; Said compensating module is the Dynamic Signal through the signal detection module controls, and it is used for amplifying circuit is finely tuned compensation.
Further, the present invention also provides a kind of signal amplifier implementation method of automatic conversion input impedance, and it comprises:
The 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, variableimpedance control module correspondence is controlled reducing of input impedance or is increased;
The signal detection module compensates amplifying circuit through compensating module simultaneously.
Reference voltage module among the present invention adopts the subthreshold value band gap reference that one reference voltage is provided.
In signal detection module detecting real-time input signal process, the signal detection module is carried out the array classification with reference voltage, produces a plurality of component voltages, produces the control signal corresponding control variableimpedance module and the compensating module of two correspondences simultaneously.
Variableimpedance control module of the present invention is the dynamically changeable electric resistance array through the signal detection module controls, and compensating module is the Dynamic Signal through the signal detection module controls, and it is used for amplifying circuit is finely tuned compensation.
In said size according to input signal and reference voltage comparative result; In the step that reduces or increase of the corresponding control of variableimpedance control module input impedance; 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.
Signal amplifier and its implementation of the automatic conversion input impedance of the present invention; Improvement is made in its preamplifier design to tiny signal in sensor field; Can effectively improve sensitivity, and the technical indicator such as signal to noise ratio of signal amplifier; Enlarge the range of application of signal amplifier, greatly improved the performance and the corresponding application of sensor field level of amplifier.
Description of drawings
Fig. 1 is the circuit module sketch map of signal amplifier one specific embodiment of the automatic conversion input impedance of the present invention;
Fig. 2 is the flow chart of signal amplifier implementation method one specific embodiment of the automatic conversion input impedance of the present invention.
Embodiment
As shown in Figure 1, the present invention provides a kind of signal amplifier of automatic conversion input impedance, comprising: signal input part 10, amplifying circuit 20, and with the signal output part 30 of amplifying circuit 20 electric connections.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 used to provide one group of reference voltage.Signal detection module 50 is used for the detecting real-time input signal, and relatively back according to the strong and weak size conversion of controlling input impedance of signal with reference voltage.Variableimpedance control module 60 is used to control the size of input impedance.Compensating module 70 is used to produce compensating signal amplifying circuit 20 is compensated.
As a kind of specific embodiment of the present invention, said reference voltage module 40 1 ends and amplifying circuit 20 electrically connect, and the other end and signal detection module 50 electrically connect; Signal detection module 50 also respectively with signal input part 10, variableimpedance control module 60, and compensating module 70 electrically connect; Variableimpedance control module 60 1 ends and signal input part 10 electrically connect, and the other end and amplifying circuit 20 electrically connect; Compensating circuit 70 also electrically connects with amplifying circuit 20.
In the present invention, said reference voltage module 40 can be a built-in subthreshold value band gap reference, and it offers signal detection module 50 1 high-precision reference voltages.Signal detection module 50 is used for the detecting real-time input signal, and reference voltage is carried out the array classification, and produces the control signal corresponding control variableimpedance control module 60 and the compensating module 70 of two correspondences.Variableimpedance control module 60 is the dynamically changeable electric resistance array through 50 controls of signal detection module.Compensating module 70 is the Dynamic Signal through 50 controls of signal detection module, and it is used for amplifying circuit 20 is finely tuned compensation.The present invention is through signal detection module 50 detecting real-time input signals; The size of control input impedance; Different input impedance correspondences strengthens input impedance through compensating the balance input range by 70 pairs of amplifying circuits 20 of compensating module in the time of can realizing the small-signal input with this, reduces signal attenuation, improves sensitivity; Reduce input impedance during the large-signal input, avoid the purpose that signal jam occurs and realize high s/n ratio.
Further, as shown in Figure 2, the present invention also provides a kind of signal amplifier implementation method of automatic conversion input impedance, and it comprises:
In sum; Signal amplifier and its implementation of the automatic conversion input impedance of the present invention; Improvement is made in its preamplifier design to tiny signal in sensor field; Can effectively improve sensitivity, and the technical indicator such as signal to noise ratio of signal amplifier, enlarge the range of application of signal amplifier, greatly improve the performance and the corresponding application of sensor field level of amplifier.
The above; For the person of ordinary skill of the art; Can make other various corresponding changes and distortion according to technical scheme of the present invention and technical conceive, and all these changes and distortion all should belong to the protection range of accompanying Claim of the present invention.
Claims (10)
1. the signal amplifier of an automatic conversion input impedance, comprise signal input part, amplifying circuit, and with the signal output part of amplifying circuit electric connection, it is characterized in that, also comprise:
The reference voltage module is used to provide reference voltage;
The signal detection module is used for the detecting real-time input signal, and relatively back according to the strong and weak size conversion of controlling input impedance of signal with reference voltage;
The variableimpedance control module is used to control the size of input impedance;
Compensating module is used to produce compensating signal amplifying circuit is compensated.
2. the signal amplifier of automatic conversion input impedance as claimed in claim 1 is characterized in that, said reference voltage module one end and amplifying circuit electrically connect, and the other end and signal detection module electrically connect; The signal detection module also respectively with signal input part, variableimpedance control module, and compensating module electrically connect; Variableimpedance control module one end and signal input part electrically connect, and the other end and amplifying circuit electrically connect; Compensating circuit also electrically connects with amplifying circuit.
3. the signal amplifier of automatic conversion input impedance as claimed in claim 1 is characterized in that, said reference voltage module is a subthreshold value band gap reference.
4. the signal amplifier of automatic conversion input impedance as claimed in claim 1; It is characterized in that; Said signal detection module is used for the detecting real-time input signal, and reference voltage is carried out the array classification, and produces the control signal corresponding control variableimpedance control module and the compensating module of two correspondences.
5. the signal amplifier of automatic conversion input impedance as claimed in claim 1 is characterized in that, said variableimpedance control module is the dynamically changeable electric resistance array through the signal detection module controls; Said compensating module is the Dynamic Signal through the signal detection module controls, and it is used for amplifying circuit is finely tuned compensation.
6. the signal amplifier implementation method of an automatic conversion input impedance is characterized in that, comprising:
The 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, variableimpedance control module correspondence is controlled reducing of input impedance or is increased;
The signal detection module compensates amplifying circuit through compensating module simultaneously.
7. the signal amplifier implementation method of automatic conversion input impedance as claimed in claim 6 is characterized in that, said reference voltage module adopts the subthreshold value band gap reference that one reference voltage is provided.
8. the signal amplifier implementation method of automatic conversion input impedance as claimed in claim 6; It is characterized in that; In the said signal detection module detecting real-time input signal process; The signal detection module is carried out the array classification with reference voltage, produces a plurality of component voltages, produces the control signal corresponding control variableimpedance module and the compensating module of two correspondences simultaneously.
9. the signal amplifier implementation method of automatic conversion input impedance as claimed in claim 6; It is characterized in that; Said variableimpedance control module is the dynamically changeable electric resistance array through the signal detection module controls; Compensating module is the Dynamic Signal through the signal detection module controls, and it is used for amplifying circuit is finely tuned compensation.
10. the signal amplifier implementation method of automatic conversion input impedance as claimed in claim 6; It is characterized in that; Said size according to input signal and reference voltage comparative result; In the step that reduces or increase of the corresponding control of variableimpedance control module input impedance, greater than reference voltage, then signal detection module controls variableimpedance control module reduces input impedance as if input signal; 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.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| 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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| Publication Number | Publication Date |
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| CN102427338A true CN102427338A (en) | 2012-04-25 |
| CN102427338B CN102427338B (en) | 2015-05-20 |
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Citations (6)
| 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 |
| US20040051589A1 (en) * | 2002-09-17 | 2004-03-18 | Mitsubishi Denki Kabushiki Kaisha | High-frequency power amplifier |
| 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 |
-
2011
- 2011-09-26 CN CN201110287583.7A patent/CN102427338B/en not_active Expired - Fee Related
Patent Citations (6)
| 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 |
| US20040051589A1 (en) * | 2002-09-17 | 2004-03-18 | Mitsubishi Denki Kabushiki Kaisha | High-frequency power amplifier |
| 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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| CN102427338B (en) | 2015-05-20 |
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