CN103546106A - Signal amplification circuit - Google Patents
Signal amplification circuit Download PDFInfo
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- CN103546106A CN103546106A CN201310448742.6A CN201310448742A CN103546106A CN 103546106 A CN103546106 A CN 103546106A CN 201310448742 A CN201310448742 A CN 201310448742A CN 103546106 A CN103546106 A CN 103546106A
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Abstract
The invention discloses a signal amplification circuit which comprises a transistor TR1, a constant current source circuit and a voltage and current converting circuit. The output end of the constant current source circuit and the input end of the voltage and current converting circuit are both connected with the collector of the transistor TR1 to enable the base and the emitter of the transistor TR1 to serve as the non-inverting input end and the inverting input end of the signal amplification circuit respectively, and the output end of the voltage and current converting circuit serves as the output end of the signal amplification circuit. Due to the fact that the constant current source circuit is used for replacing a resistor load to carry out voltage amplification, the motional impedance of a constant current source is almost infinite, according to the formula U=IR, obvious changes of the voltage can be caused by small current changes, and obvious amplification of the voltage is achieved; in addition, due to a high-impedance load of the collector of the transistor TR1, influences, caused by changes of the load current, on the voltage at the input BE end are relieved, and distortion of the signal amplification circuit is reduced.
Description
Technical field
The present invention relates to a kind of basis of signals amplifying circuit, relate in particular to a kind of signal amplification circuit of low distortion.
Background technology
The function of amplifying circuit is to utilize Current Control effect or the effect of field effect transistor voltage control of triode, the faint signal of telecommunication is amplified to required numerical value, realizes the energy of DC power supply is partly converted to by the variation of input signal rule and has the output signal compared with macro-energy.The essence of amplifying circuit is that the energy that a kind of use is less removes to control the energy conversion device compared with macro-energy conversion.
Triode is realized, and is the amplification of electric current in fact, by the little variation of base current, controls the large variation of collector current, thereby realizes enlarging function.And people control in tandem circuit in the amplification such as electronic devices such as sound systems, all adopt collector load resistor RC or other resistance as load resistance RL, by the change transitions of transistor collector electric current, be change in voltage, to realize voltage amplification.The amplifying circuit of this traditional structure, needs electric current to produce larger variation, just can cause that voltage produces larger variation, realizes enlarging function; If curent change is less, enlarging function is not obvious does not even amplify, and because the variation of output current can have influence on input signal, causes the distortion factor of traditional amplifying circuit higher.
Between BE knot due to triode, have impedance, controlling transistor collector curent change can affect the voltage drop between BE knot, and the raw information form of input signal is changed, and causes distortion to be difficult to eliminate, and conventional art field lacks concrete solution.
Summary of the invention
Object of the present invention is just to provide a kind of signal amplifier, in order to overcome classical signal amplifier, causes the problem of distorted signals because of input and output impedance.
To achieve these goals, the technical solution used in the present invention is such: a kind of signal amplification circuit, comprise a triode TR1, a constant-current source circuit and a voltage-current converter circuit, wherein, the output of described constant-current source circuit, the input of voltage-current converter circuit are all connected with the collector electrode of triode TR1, make the base stage of triode TR1 and emitter respectively as in-phase input end and the inverting input of this signal amplification circuit, the output of voltage-current converter circuit is as the output in this signal amplification circuit.
Compared with prior art, the invention has the advantages that: owing to having adopted constant-current source circuit to replace load resistance to carry out voltage amplification, the motional impedance of constant-current source is almost infinitely great, and the input impedance of the basic voltage-current converter circuit without current drives is also almost infinitely great.According to the formula of U=IR, small curent change, all can cause voltage to occur one and significantly change a bit, thereby realizes the amplification of voltage, and amplification effect is obvious.Simultaneously, because the curent change of constant-current source own levels off to zero, triode TR1 base is penetrated required control curent change and is leveled off to zero, dynamic electric voltage variation between the B E knot of triode levels off to zero, isolate the impact of amplifying circuit output current on input signal, thereby made the distortion of amplifying circuit level off to zero.The present invention has not only solved problem of dtmf distortion DTMF but also simplified circuit, has improved reliability stability and frequency range, is more suitable for circuit integration, can be widely used in numerous areas, greatly reduces manufacturing cost.
Accompanying drawing explanation
Fig. 1 is circuit block diagram of the present invention;
Fig. 2 traditional circuit adopts the oscillogram of ohmic load;
Fig. 3 is the oscillogram that the present invention adopts current source loads;
Fig. 4 is voltage-current converter circuit example 1 of the present invention;
Fig. 5 is voltage-current converter circuit example 2 of the present invention;
Fig. 6 is that the present invention is applied in the example 1 in difference channel;
Fig. 7 is that the present invention is applied in the example 2 in difference channel.
Embodiment
The invention will be further described below in conjunction with the accompanying drawings and the specific embodiments.
Embodiment: referring to Fig. 1 to Fig. 7, the invention provides a kind of signal amplification circuit, comprise a triode TR1, a constant-current source circuit CCS and a voltage-current converter circuit, wherein, the output of described constant-current source circuit, the input of voltage-current converter circuit are all connected with the collector electrode of triode TR1, feedback link between voltage-current converter circuit output and triode TR1 is prior art, do not repeat them here, it can feed back to the emitter of triode TR1, also can feed back to the base stage of triode TR1.The base stage of triode TR1 and emitter are respectively as in-phase input end and the inverting input of this signal amplification circuit, and the output of voltage-current converter circuit is as the output in this signal amplification circuit.
The present invention is owing to having adopted constant-current source circuit to replace load resistance to carry out voltage amplification, and the motional impedance of constant-current source is almost infinitely great.According to the formula of U=IR, small curent change, all can cause voltage to occur one and significantly change a bit, thereby realizes the amplification of voltage, and amplification effect is obvious.Simultaneously, because the curent change of constant-current source own levels off to zero, triode TR1 base is penetrated required control curent change and is leveled off to zero, dynamic electric voltage variation between the B E knot of triode levels off to zero, isolate the impact of amplifying circuit output current on input signal, thereby made the distortion of amplifying circuit level off to zero.The present invention has not only solved problem of dtmf distortion DTMF but also simplified circuit, has improved reliability, stability and frequency range, is more suitable for circuit integration, can be widely used in numerous areas, greatly reduces manufacturing cost.
Voltage-current converter circuit in the present invention is not limited to one or both, if can realize voltage is changed into function of current circuit all can, specifically referring to signal amplification circuit application circuit Fig. 4 of the present invention and Fig. 5.Its essence is all to utilize constant-current source circuit to replace load resistance to carry out voltage amplification, and difference is that the change-over circuit in concrete application is different, is prior art, does not repeat them here.
In Fig. 4, voltage-current converter circuit is realized by transistor T R2, connects the emitter of triode TR1 by R1, R2 feedback network, realizes negative feedback function.In Fig. 5, utilize triode TR2 and triode TR3 to realize electric current and voltage conversion, R1, R2 still connect the emitter of TR1, realize negative feedback function.
Meanwhile, the present invention also can be applied in difference channel, referring to Fig. 6 and Fig. 7.
The above, be only the better basic case study on implementation of the present invention, therefore can not limit scope of the invention process with this, the equivalence of doing according to the present patent application the scope of the claims and description changes and modifies, and all should still remain within the scope of the patent.
Claims (1)
1. a signal amplification circuit, it is characterized in that: comprise a triode TR1, a constant-current source circuit and a voltage-current converter circuit, wherein, the output of described constant-current source circuit, the input of voltage-current converter circuit are all connected with the collector electrode of triode TR1, make the base stage of triode TR1 and emitter respectively as in-phase input end and the inverting input of this signal amplification circuit, the output of voltage-current converter circuit is as the output in this signal amplification circuit.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310448742.6A CN103546106A (en) | 2013-10-21 | 2013-10-21 | Signal amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201310448742.6A CN103546106A (en) | 2013-10-21 | 2013-10-21 | Signal amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN103546106A true CN103546106A (en) | 2014-01-29 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201310448742.6A Pending CN103546106A (en) | 2013-10-21 | 2013-10-21 | Signal amplification circuit |
Country Status (1)
| Country | Link |
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| CN (1) | CN103546106A (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105303749A (en) * | 2015-11-30 | 2016-02-03 | 无锡拓能自动化科技有限公司 | Fire monitoring device |
| CN105336082A (en) * | 2015-11-30 | 2016-02-17 | 无锡拓能自动化科技有限公司 | Intelligent monitoring device for residential fire |
| CN105448023A (en) * | 2015-11-30 | 2016-03-30 | 无锡拓能自动化科技有限公司 | Solar forest fire warning device |
| CN105513255A (en) * | 2015-11-30 | 2016-04-20 | 无锡拓能自动化科技有限公司 | Internet of things-based fire monitoring apparatus |
Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000134045A (en) * | 1998-10-28 | 2000-05-12 | Texas Instr Japan Ltd | Voltage-to-current conversion circuit |
| CN2428915Y (en) * | 2000-05-31 | 2001-05-02 | 庄士京 | Amplifier without power-supply noise |
| CN1698266A (en) * | 2003-03-07 | 2005-11-16 | 索尼爱立信移动通信日本株式会社 | Communication terminal device and amplification circuit |
| CN201549066U (en) * | 2009-12-14 | 2010-08-11 | 哈尔滨工业大学 | Multi-parameter remote transmission device based on analog electric current loop |
-
2013
- 2013-10-21 CN CN201310448742.6A patent/CN103546106A/en active Pending
Patent Citations (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP2000134045A (en) * | 1998-10-28 | 2000-05-12 | Texas Instr Japan Ltd | Voltage-to-current conversion circuit |
| CN2428915Y (en) * | 2000-05-31 | 2001-05-02 | 庄士京 | Amplifier without power-supply noise |
| CN1698266A (en) * | 2003-03-07 | 2005-11-16 | 索尼爱立信移动通信日本株式会社 | Communication terminal device and amplification circuit |
| CN201549066U (en) * | 2009-12-14 | 2010-08-11 | 哈尔滨工业大学 | Multi-parameter remote transmission device based on analog electric current loop |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN105303749A (en) * | 2015-11-30 | 2016-02-03 | 无锡拓能自动化科技有限公司 | Fire monitoring device |
| CN105336082A (en) * | 2015-11-30 | 2016-02-17 | 无锡拓能自动化科技有限公司 | Intelligent monitoring device for residential fire |
| CN105448023A (en) * | 2015-11-30 | 2016-03-30 | 无锡拓能自动化科技有限公司 | Solar forest fire warning device |
| CN105513255A (en) * | 2015-11-30 | 2016-04-20 | 无锡拓能自动化科技有限公司 | Internet of things-based fire monitoring apparatus |
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| RJ01 | Rejection of invention patent application after publication |
Application publication date: 20140129 |
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| RJ01 | Rejection of invention patent application after publication |