CN201655111U - Multi-stage small signal amplifier - Google Patents
Multi-stage small signal amplifier Download PDFInfo
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- CN201655111U CN201655111U CN2010201248834U CN201020124883U CN201655111U CN 201655111 U CN201655111 U CN 201655111U CN 2010201248834 U CN2010201248834 U CN 2010201248834U CN 201020124883 U CN201020124883 U CN 201020124883U CN 201655111 U CN201655111 U CN 201655111U
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Abstract
The utility model discloses a multi-stage small signal amplifier, which is used for amplifying current of an MK1, and comprises a triode, a switch, a diode, resistors and capacitors. A positive pole of the MK1 is connected with a negative pole of an R1; a negative pole of the MK1 is grounded; a negative pole of a VD1 is connected with a power supply; a negative pole of the VD1 is connected with a collector of a VT3; a VT1 common emitter amplifying circuit and a VT2 common emitter amplifying circuit form a voltage gain amplifier; a VT3 is an emitter follower; an emitter of the VT3 is connected with a positive pole of a C3; a J1 is connected between emitters of an R12 and the VT1; a J2 and a C9 are connected between negative poles of the R12 and the C3 in series; the J3 is connected between the emitter of the VT2 and an R13 and an R14; a J4 is connected between a base pole and a collector of the VT2; a J5 is connected between collectors of the VT1 and the VT2; and a C7 is connected with an output end of a circuit. The multi-stage small signal amplifier brings convenience for studying effect of element parameter changes on amplifier gain and frequency response, and leads users to deeply understand and master the multi-stage small signal amplifier.
Description
Technical field
The utility model relates to a kind of multistage small signal amplifier.
Background technology
Small signal amplifier with the transistor composition, it is the most basic content in the Analogical Electronics, but the knowledge point that comprises is quite a lot of, the notion that suitable quiescent point not only will be arranged, the form of forming various amplifying circuits in addition, various negative feedbacks are arranged, be used to improve various performance index, amplifying circuit also has the frequency response of input and output impedance, circuit or the like index.Polystage amplifier also has the operating bias mode, gain bandwidth product, gain calculating method or the like notion.In teaching process, the variation of circuit elements device parameters can influence the variation of which circuit parameter, and the localized variation of circuit can influence the variation of which circuit parameter again, has many problems to depend alone and is difficult in theory get a real idea of and grasp.
The utility model content
The purpose of this utility model is to provide a kind of multistage small signal amplifier, can study the influence that component parameter changes pair amplifier gain, frequency response easily, conveniently profoundly understands and grasps multistage small signal amplifier.
The technical scheme that realizes the utility model purpose is: a kind of multistage small signal amplifier is used to amplify the electric current of MK1; Comprise three triodes, five switch, diode and resistance and electric capacity; The positive pole of MK1 is connected minus earth with the end of R1; The anode of VD1 connects power supply, and negative electrode is connected with the collector of VT3; Form voltage gain amplifier by VT1 and VT2 two-stage cascode level amplifying circuit; VT3 is an emitter-follower, and emitter is connected with the positive pole of C3; J1 is connected between the emitter of R12 and VT1; J2 and C9 are connected between the negative pole of R12 and C3; J3 is connected between the emitter and R13, R14 of VT2; J4 is connected between the base stage and collector of VT2; J5 is connected between the collector of VT1 and VT2; The output terminal of C7 connecting circuit.
Multistage small signal amplifier also comprises C6 and the Hi-pass filter of being made up of C4 and R3; Be connected after C4 and the C6 series connection between the base stage of the end of R1 and VT1, the end of R3 connects the negative pole of C6, other end ground connection.
The negative electrode of described VD1 also is connected with the anode of VD2, the positive pole of C2, the end of R4, the end of R7; The emitter of VT1 also is connected with R9; The collector of VT2 all is connected with the other end of R7 with the base stage of VT3; The base stage of VT2 is connected with the collector of VT1; The negative electrode of VD2 is connected with the end of R5; The other end of R4 is connected with the positive pole of R1, R6, C1, and the other end of R6 is connected with the collector of VT1; The end of R2 is connected with the base stage of VT1, and the other end of R2 is connected with the end of the positive pole of C8, R10 and R8, R13, R14, and the other end of R13, R14 is connected with the negative pole of J3, and the other end of R8 is connected with the emitter of VT2; The other end ground connection of the negative pole of C1, C2, C8 and R3, R5, R9, R10, R11.
The utlity model has following beneficial effect: (1) the utility model is provided with J1, J2, J3, J4, five switches of J5, make amplifier reach the frequency response index of 30dB voltage gain, 200Hz～100kHz, the normal operating conditions of five switches is J1, J2, J3, J4 closure in the utility model, and J5 disconnects.When J5 was also closed, the lower frequency limit of circuit was constant, and upper limiting frequency descends; When disconnecting J2, when other switch is in normal operating conditions, can find that this circuit produces self-excitation, is appreciated that thus will introduce the inter-stage negative feedback must select suitable coupling capacitance, makes it satisfy phase condition; When disconnecting J3, when other switch is in normal operating conditions, can find that circuit voltage gain, circuit frequency response do not change; But when circuit is in open loop situations, when promptly J1 disconnects, disconnect J3 again, can find that voltage gain obviously descends; The voltage gain that is appreciated that this circuit thus depends on Voltage Series negative feedback network---R12, R9, the C3 of inter-stage; Therefore by changing the state of these switches, can study the influence that component parameter changes pair amplifier gain, frequency response, further understand the effect of negative feedback in multistage small signal amplifier, understand the notion of feedback at the corresponding levels, inter-stage feedback, understanding exchanges the Negative Feedback Amplifier Pair performance indexes.
(2) the utility model adopts three grades of directly couplings, and by the multistage small signal amplifier that three triodes are formed, VT1 and VT2 two-stage cascode level amplifying circuit are formed voltage gain amplifier, and the VT1 and the VT2 corresponding levels, inter-stage all have certain alternating current-direct current negative feedback; VT3 is an emitter-follower, does not have voltage gain, and static adjustment is simple relatively.
(3) base current of the utility model VT1 is to take from the voltage drop on R10 that is proportional to VT2 by R2, adopt this mutual biasing circuit, solved the problem that transistor causes the quiescent point of setting also to change because of variation of temperature thereupon, so good stability.
(4) the utility model has increased the Hi-pass filter that C4, R3 constitute, and this Hi-pass filter of microphone MK1 process is the filter out power ripple further, raises the lower frequency limit of circuit frequency response.
(5) the utility model is in a multistage amplifier circuits, in the knowledge point of the required grasp of discrete component amplifier part substantially all is encompassed in, is very suitable for teaching and promotes.
Description of drawings
For the easier quilt of content of the present utility model is clearly understood, according to specific embodiment also in conjunction with the accompanying drawings, the utility model is described in further detail, wherein below
Fig. 1 is a structural representation of the present utility model.
Embodiment
See Fig. 1, the multistage small signal amplifier that present embodiment is made up of three triodes, VT1 and VT2 two-stage cascode level amplifying circuit are formed voltage gain amplifier, and the VT1 and the VT2 corresponding levels, inter-stage all have certain alternating current-direct current negative feedback; VT3 is an emitter-follower, does not have voltage gain.The anode of VD1 connects power supply, and the negative electrode of VD1 is connected with the collector of the anode of VD2, VT3, the positive pole of C2, the end of R4, the end of R7.The negative electrode of VD2 is connected with the end of R5.The emitter of VT3 is connected with the end of R11, the positive pole of C3, C7, and the output terminal of C7 connecting circuit, J2 and C9 are connected between the negative pole of the end of R12 and C3, and J1 is connected between the emitter of the other end of R12 and VT1.The emitter of VT1 also is connected with R9.The collector of VT2 all is connected with the other end of R7 with the base stage of VT3.The base stage of VT2 is connected with the collector of VT1, is connected between the base stage and collector of VT2 after J4 and the C10 series connection, is connected between the collector of VT1 and VT2 after J5 and the C5 series connection.The other end of R4 is connected with the end of R1, the end of R6, the positive pole of C1, and the other end of R6 is connected with the collector of VT1.The end of R1 and the positive pole of MK1 connect, and are connected after C4 and the C6 series connection between the base stage of the end of R1 and VT1, and R3 is connected between C4 and the C6.The end of R2 is connected with the base stage of VT1, and the end of the end of the other end of R2 and the positive pole of C8, R10 and R8, R13, R14 is connected, and the other end of R13, R14 is connected with the negative pole of J3, and the other end of R8 and J3 all is connected with the emitter of VT2.The other end ground connection of the negative pole of C1, C2, C8MK1, R3, R5, R9, R10, R11.
Should be appreciated that specific embodiment described above only is used to explain the utility model, and be not used in qualification the utility model.Conspicuous variation of being extended out by spirit of the present utility model or change still are among the protection domain of the present utility model.
Claims (3)
1. multistage small signal amplifier is used to amplify the electric current of MK1; It is characterized in that: comprise three triodes, five switch, diode and resistance and electric capacity; The positive pole of MK1 is connected minus earth with the end of R1; The anode of VD1 connects power supply, and negative electrode is connected with the collector of VT3; Form voltage gain amplifier by VT1 and VT2 two-stage cascode level amplifying circuit; VT3 is an emitter-follower, and emitter is connected with the positive pole of C3; J1 is connected between the emitter of R12 and VT1; J2 and C9 are connected between the negative pole of R12 and C3; J3 is connected between the emitter and R13, R14 of VT2; J4 is connected between the base stage and collector of VT2; J5 is connected between the collector of VT1 and VT2; The output terminal of C7 connecting circuit.
2. a kind of multistage small signal amplifier according to claim 1 is characterized in that: also comprise C6 and the Hi-pass filter of being made up of C4 and R3; Be connected after C4 and the C6 series connection between the base stage of the end of R1 and VT1, the end of R3 connects the negative pole of C6, other end ground connection.
3. a kind of multistage small signal amplifier according to claim 2 is characterized in that: the negative electrode of described VD1 also is connected with the anode of VD2, the positive pole of C2, the end of R4, the end of R7; The emitter of VT1 also is connected with R9; The collector of VT2 all is connected with the other end of R7 with the base stage of VT3; The base stage of VT2 is connected with the collector of VT1; The negative electrode of VD2 is connected with the end of R5; The other end of R4 is connected with the positive pole of R1, R6, C1, and the other end of R6 is connected with the collector of VT1; The end of R2 is connected with the base stage of VT1, and the other end of R2 is connected with the end of the positive pole of C8, R10 and R8, R13, R14, and the other end of R13, R14 is connected with the negative pole of J3, and the other end of R8 is connected with the emitter of VT2; The other end ground connection of the negative pole of C1, C2, C8 and R3, R5, R9, R10, R11.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201248834U CN201655111U (en) | 2010-03-08 | 2010-03-08 | Multi-stage small signal amplifier |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2010201248834U CN201655111U (en) | 2010-03-08 | 2010-03-08 | Multi-stage small signal amplifier |
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| Publication Number | Publication Date |
|---|---|
| CN201655111U true CN201655111U (en) | 2010-11-24 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN2010201248834U Expired - Fee Related CN201655111U (en) | 2010-03-08 | 2010-03-08 | Multi-stage small signal amplifier |
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| CN (1) | CN201655111U (en) |
Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103249172A (en) * | 2013-04-19 | 2013-08-14 | 无锡乾煜信息技术有限公司 | System for intelligent linkage of mobile terminal and AP (access point) in area and method |
| CN103698588A (en) * | 2012-09-27 | 2014-04-02 | 无锡华润矽科微电子有限公司 | Zero-crossing detection circuit structure |
| CN105261270A (en) * | 2015-11-26 | 2016-01-20 | 江苏海事职业技术学院 | Training-used resistance-capacitance coupled amplifier circuit |
| CN111162765A (en) * | 2020-01-20 | 2020-05-15 | 山东建筑大学 | Experimental MOSFET (Metal-oxide-semiconductor field Effect transistor) and BJT (Bipolar junction transistor) cascade voltage amplification circuit |
-
2010
- 2010-03-08 CN CN2010201248834U patent/CN201655111U/en not_active Expired - Fee Related
Cited By (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN103698588A (en) * | 2012-09-27 | 2014-04-02 | 无锡华润矽科微电子有限公司 | Zero-crossing detection circuit structure |
| CN103249172A (en) * | 2013-04-19 | 2013-08-14 | 无锡乾煜信息技术有限公司 | System for intelligent linkage of mobile terminal and AP (access point) in area and method |
| CN105261270A (en) * | 2015-11-26 | 2016-01-20 | 江苏海事职业技术学院 | Training-used resistance-capacitance coupled amplifier circuit |
| CN111162765A (en) * | 2020-01-20 | 2020-05-15 | 山东建筑大学 | Experimental MOSFET (Metal-oxide-semiconductor field Effect transistor) and BJT (Bipolar junction transistor) cascade voltage amplification circuit |
| CN111162765B (en) * | 2020-01-20 | 2023-09-22 | 山东建筑大学 | Cascaded voltage amplifying circuit of MOSFET (Metal-oxide-semiconductor field Effect transistor) and BJT (bipolar junction transistor) for experiments |
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Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| C14 | Grant of patent or utility model | ||
| GR01 | Patent grant | ||
| C17 | Cessation of patent right | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20101124 Termination date: 20120308 |