CN206629034U - A kind of signal amplification circuit - Google Patents
A kind of signal amplification circuit Download PDFInfo
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- CN206629034U CN206629034U CN201720309738.5U CN201720309738U CN206629034U CN 206629034 U CN206629034 U CN 206629034U CN 201720309738 U CN201720309738 U CN 201720309738U CN 206629034 U CN206629034 U CN 206629034U
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- series connection
- transmission lines
- electric capacity
- impedance transmission
- resistance
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Abstract
The utility model discloses a kind of signal amplification circuit, it is characterized in that, including electric capacity C1, impedance transmission lines converter T1, differential feedback amplifying circuit, impedance transmission lines converter T2, power supply Vc and resistance R6, the differential feedback amplifying circuit has symmetrical structure, including by electric capacity C2, C3, resistance R1, R2, R3, R4, the same mutually amplification link that transistor Q1 is formed, with by electric capacity C2 ', C3 ', resistance R1 ', R2 ', R3 ', R4 ', another Zhi Fanxiang amplification links of transistor Q1 ' compositions.Advantage：Symmetrically acted on using the terminal potential of difference channel two, drift voltage counteracting can be reached to the effect of the null offset of rejective amplifier, improve stability of the amplifier gain with it by temperature change；Can effectively it linearize, compensating non-linear distortion improves the IP3 performances of amplifier.
Description
Technical field
A kind of signal amplification circuit is the utility model is related to, belongs to Signal Collection Technology field.
Background technology
In superhet short-wave receiver, the selection principle of local oscillation signal amplitude is lost with the intermediate-freuqncy signal exported after mixing
Very at least it is defined.It is its frequency stability of guarantee when local oscillator designs, avoids frequency drift from impacting, generally use small volume,
The high single-chip integration digital frequency synthesizer of reliability, also limits its output amplitude.And frequency mixer is in local oscillator input range
When insufficient, it is impossible to reach its optimum performance so that the IP3 of receiver（Three rank sections）Degradation
In crystal amplifier, there is larger voltage and current multiplication factor with grounded emitter circuit.But crystal plumber
As when null offset be present, once temperature environment changes, produce drift voltage, amplifier cannot be distinguished by signal voltage and drift
Voltage is moved, so as to reduce amplification performance, generates drift noise.
The content of the invention
Technical problem to be solved in the utility model is the defects of overcoming prior art, there is provided a kind of signal amplification electricity
Road.
In order to solve the above technical problems, the utility model provides a kind of signal amplification circuit, it is characterized in that, including electric capacity
C1, impedance transmission lines converter T1, differential feedback amplifying circuit, impedance transmission lines converter T2, power supply Vc and resistance R6, it is described
Differential feedback amplifying circuit has a symmetrical structure, including by electric capacity C2, C3, resistance R1, R2, R3, R4, transistor Q1 form one
Zhi Tongxiang amplifies link, and by electric capacity C2 ', C3 ', resistance R1 ', R2 ', R3 ', R4 ', another Zhi Fanxiang of transistor Q1 ' compositions
Amplify link；
Signal input part connects C1 one end and T1 primary Same Name of Ends, C1 other end ground connection, secondary Same Name of Ends respectively
C2 is met, four tunnels are divided into after C2, Q1 colelctor electrode and T2 secondary Same Name of Ends, the second tunnel are connect respectively after the first via series connection C3, R3
Q1 base stage is connect, is grounded after the 3rd tunnel series connection R1, the 4th tunnel series connection R2 is followed by Vc positive pole, and the connection of Q1 emitting stage is also classified into
Two-way, wherein series connection R5 is followed by Q1 ' emitting stage all the way, it is grounded after another way series connection R4；
T1 secondary different name meets C2 ', is also classified into four tunnels, wherein meeting Q1 ' respectively after first via series connection C3 ', R3 ' after C2 '
Colelctor electrode and T2 secondary different name end, the second tunnel connects Q1 ' base stage, and the 3rd tunnel series connection R1 ' is grounded afterwards, the 4th tunnel series connection R2 '
Vc positive pole is followed by, the connection of Q1 ' emitting stage is also classified into two-way, wherein series connection R5 is followed by Q1 emitting stage, another way all the way
The R4 ' that connects is grounded afterwards；
The secondary centre tap of the T2 and Vc positive pole connect, T2 primary Same Name of Ends difference connecting resistance R6 one end and
The other end ground connection of output end, wherein R6.
Further, the transistor Q1, Q1 ' use S9013NPN transistors.
Further, the impedance transmission lines converter T1 uses two-wire 1:1 impedance transmission lines converter.
Further, the impedance transmission lines converter T2 uses three lines 1:1 impedance transmission lines converter.
Further, the electric capacity uses polarity free capacitor, and its capacitance is height by the corresponding selection of frequency of institute's amplified signal
Frequency operation element.
Further, the power supply Vc is DC voltage, and its magnitude of voltage is no more than transistor Q1, Q1 ' pressure voltage.
The beneficial effect that the utility model is reached：
Utility model employs 1:1 impedance transmission lines converter carries out difference to amplifying circuit, and R3, C3 have been that negative-feedback is made
With；And improvement is added on the basis of differential feedback amplification, R4, R5 triangular form resistor network are can not for difference channel
When full symmetric, both ends null offset voltage is balanced and is absorbed and is fed back to and suppress null offset in circuit；C1 is used for adjusting
With the high low side amplitude of frequency range, subtract the passband fluctuation after low level signal amplification, and improve input vswr, R6 is used for allocating output resistance
It is anti-, improve output VSWR, reduce return loss so that local oscillation signal can at utmost be amplified utilization；Utilize differential electrical
The terminal potential of road two is symmetrically acted on, and drift voltage counteracting can be reached to the effect of the null offset of rejective amplifier, improves amplification
Stability of the device by temperature change；Can effectively it linearize, compensating non-linear distortion improves the IP3 performances of amplifier.
Brief description of the drawings
Fig. 1 is the circuit block diagram of this practicality.
Embodiment
The utility model is further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating this
The technical scheme of utility model, and the scope of protection of the utility model can not be limited with this.
As shown in figure 1, a kind of signal amplification circuit, it is characterized in that, including electric capacity C1, impedance transmission lines converter T1, difference
Divide feedback amplifier, impedance transmission lines converter T2, power supply Vc（Transistor operating voltage）With resistance R6, the differential feedback
Amplifying circuit has symmetrical structure, including is mutually put together by electric capacity C2, C3, resistance R1, R2, R3, R4, one of transistor Q1 compositions
Big link, and by electric capacity C2 ', C3 ', resistance R1 ', R2 ', R3 ', R4 ', another Zhi Fanxiang amplification links of transistor Q1 ' compositions；
Electric capacity described in text is polarity free capacitor, is the transport element of high-frequency signal, plays coupling, blocking, allotment impedance etc.
Effect.Wherein C1 is as external input signal to the inconsistent matching element of impedance during this amplifying circuit.Signal vi is inputted to resistance
Anti- transmission line transformer T1 primary Same Name of Ends, secondary termination C2 of the same name, C2 couple a signal to rear end, access transistor Q1's
Base stage, R1 and R2 form Vc bleeder circuit, and suitable bias voltage is provided for Q1 base stages.Power supply Vc positive pole access electricity
Road node, negative pole ground connection, R2 are series at Vc partial pressures, and R1 is parallel to Vc and loaded.C3 connects with R3, and both ends connect with Q1's respectively
Base stage and colelctor electrode, it is connected with impedance transfer line transformer T2 secondary Same Name of Ends after colelctor electrode amplified signal.Transistor Q1's
Emitter stage series connection R4 ground connection；Another of the difference channel, its electric capacity C2 ', C3 ', resistance R1 ', R2 ', R3 ', R4 ', crystal
Pipe Q1 ' is based on power supply Vc and ground connection with above-mentioned electric capacity C2, C3, resistance R1, R2, R3, R4, transistor Q1 respectively in annexation
Symmetrically, wherein C2 ' connections impedance transmission lines converter T1 secondary different name end, Q1 emitter stage and Q1 ' emitter series electrical
Resistance R5 connects.
The secondary centre tap of the impedance transmission lines converter T2 is connected with power supply Vc positive pole, T2 primary Same Name of Ends
After series resistance R6 ground connection, output end is connected to.
Power supply Vc is same group of voltage in text, separately labeled for distinguishing base stage and colelctor electrode operating point.
In the present embodiment, the transistor Q1, Q1 ' use S9013 transistors.
In the present embodiment, the impedance transmission lines converter T1 uses two-wire 1:1 impedance transmission lines converter.
In the present embodiment, the impedance transmission lines converter T2 uses three lines 1:1 impedance transmission lines converter.
In the present embodiment, the electric capacity uses polarity free capacitor, and can be based on pcb board form can use upright or paster shape
Formula, its capacitance are corresponded to by the frequency of institute's amplified signal and chosen.
In the present embodiment, the power supply Vc is DC voltage, and its magnitude of voltage not should be greater than transistor Q1, Q1 ' pressure voltage.
T1 in figure, T2 employ 1:1 impedance transmission lines converter carries out difference to amplifying circuit, and R3, C3, R3 ', C3 ' are
Play negative feedback.And improvement is added on the basis of differential feedback amplification, as R4, R4 ', R5 triangular form resistor network are
When can not be full symmetric for difference channel, both ends null offset voltage be balanced and is absorbed and is fed back to and suppress zero in circuit
Point drift.C1 is used for allocating the high low side amplitude of frequency range, subtracts the passband fluctuation after low level signal amplification, and improves input vswr, R6
For allocating output impedance, improve output VSWR, reduce return loss so that local oscillation signal can at utmost be amplified profit
With.
Described above is only preferred embodiment of the present utility model, it is noted that for the common skill of the art
For art personnel, on the premise of the utility model technical principle is not departed from, some improvement and deformation can also be made, these change
Enter and deform and also should be regarded as the scope of protection of the utility model.
Claims (6)
1. a kind of signal amplification circuit, it is characterized in that, including electric capacity C1, impedance transmission lines converter T1, differential feedback amplification electricity
Road, impedance transmission lines converter T2, power supply Vc and resistance R6, the differential feedback amplifying circuit have a symmetrical structure, including by
Electric capacity C2, C3, resistance R1, R2, R3, R4, the same mutually amplification link, and by electric capacity C2 ', C3 ', resistance that transistor Q1 is formed
R1 ', R2 ', R3 ', R4 ', another Zhi Fanxiang amplification links of transistor Q1 ' compositions；
Signal input part connects C1 one end and T1 primary Same Name of Ends respectively, and the C1 other end is grounded, secondary termination C2 of the same name,
It is divided into four tunnels after C2, connects Q1 colelctor electrode and T2 secondary Same Name of Ends respectively after the first via series connection C3, R3, the second tunnel connects Q1's
Base stage, it is grounded after the 3rd tunnel series connection R1, the 4th tunnel series connection R2 is followed by Vc positive pole, and the connection of Q1 emitting stage is also classified into two-way,
Wherein all the way series connection R5 is followed by Q1 ' emitting stage, is grounded after another way series connection R4；
T1 secondary different name meets C2 ', and four tunnels are also classified into after C2 ', wherein connects Q1 ' collection after first via series connection C3 ', R3 ' respectively
The secondary different name end of electrode and T2, the second tunnel connect Q1 ' base stage, and the 3rd tunnel series connection R1 ' is grounded afterwards, and the 4th tunnel series connection R2 ' is followed by
Vc positive pole, the connection of Q1 ' emitting stage are also classified into two-way, wherein series connection R5 is followed by Q1 emitting stage, another way series connection all the way
R4 ' is grounded afterwards；
The secondary centre tap of the T2 and Vc positive pole connect, T2 primary Same Name of Ends difference connecting resistance R6 one end and output
End, wherein R6 other end ground connection.
2. a kind of signal amplification circuit according to claim 1, it is characterized in that, the transistor Q1, Q1 ' uses
S9013NPN transistors.
3. a kind of signal amplification circuit according to claim 1, it is characterized in that, the impedance transmission lines converter T1 is used
Two-wire 1:1 impedance transmission lines converter.
4. a kind of signal amplification circuit according to claim 1, it is characterized in that, the impedance transmission lines converter T2 is used
Three lines 1:1 impedance transmission lines converter.
5. a kind of signal amplification circuit according to claim 1, it is characterized in that, the electric capacity uses polarity free capacitor, its
Capacitance is high-frequency work element by the corresponding selection of frequency of institute's amplified signal.
6. a kind of signal amplification circuit according to claim 1, it is characterized in that, the power supply Vc is DC voltage, its electricity
Pressure value is no more than transistor Q1, Q1 ' pressure voltage.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720309738.5U CN206629034U (en) | 2017-03-28 | 2017-03-28 | A kind of signal amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201720309738.5U CN206629034U (en) | 2017-03-28 | 2017-03-28 | A kind of signal amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206629034U true CN206629034U (en) | 2017-11-10 |
Family
ID=60208516
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201720309738.5U Expired - Fee Related CN206629034U (en) | 2017-03-28 | 2017-03-28 | A kind of signal amplification circuit |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN206629034U (en) |
-
2017
- 2017-03-28 CN CN201720309738.5U patent/CN206629034U/en not_active Expired - Fee Related
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| Date | Code | Title | Description |
|---|---|---|---|
| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CF01 | Termination of patent right due to non-payment of annual fee |
Granted publication date: 20171110 Termination date: 20210328 |
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| CF01 | Termination of patent right due to non-payment of annual fee |