CN106849885A - A kind of low noise high linear amplifier - Google Patents
A kind of low noise high linear amplifier Download PDFInfo
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- CN106849885A CN106849885A CN201710190533.4A CN201710190533A CN106849885A CN 106849885 A CN106849885 A CN 106849885A CN 201710190533 A CN201710190533 A CN 201710190533A CN 106849885 A CN106849885 A CN 106849885A
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- 238000003199 nucleic acid amplification method Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 6
- 230000005611 electricity Effects 0.000 claims description 5
- 238000000034 method Methods 0.000 claims description 5
- 230000008878 coupling Effects 0.000 claims description 3
- 238000010168 coupling process Methods 0.000 claims description 3
- 238000005859 coupling reaction Methods 0.000 claims description 3
- 238000005516 engineering process Methods 0.000 description 4
- 239000013078 crystal Substances 0.000 description 2
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Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/302—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters in bipolar transistor amplifiers
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3211—Modifications of amplifiers to reduce non-linear distortion in differential amplifiers
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/32—Modifications of amplifiers to reduce non-linear distortion
- H03F1/3223—Modifications of amplifiers to reduce non-linear distortion using feed-forward
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
- H03F3/45—Differential amplifiers
- H03F3/45071—Differential amplifiers with semiconductor devices only
- H03F3/45076—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier
- H03F3/4508—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using bipolar transistors as the active amplifying circuit
- H03F3/45098—PI types
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2200/00—Indexing scheme relating to amplifiers
- H03F2200/294—Indexing scheme relating to amplifiers the amplifier being a low noise amplifier [LNA]
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- Nonlinear Science (AREA)
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Abstract
The invention discloses a kind of low noise high linear amplifier, it is characterized in that, including differential cascade amplifying circuit and feedforward linear circuit, it is connected in feedforward linear circuit as main and auxiliary amplifying device using differential cascade amplifying circuit, so that the feedforward linear circuit is divided into two loops, first order loop is used to offset signal, and second level loop is used to eliminate error.Advantage：Multiple amplifier elements that differential cascade amplifying circuit has been used, have ensured gain amplifying power；And feedforward linear circuit so that amplification utensil is good compared with low-noise factor, IIP2 high, IIP3 performances high, relatively improves 3dB 4dB with class A amplifier A.
Description
Technical field
The present invention relates to a kind of low noise high linear amplifier, belong to Signal Collection Technology field.
Background technology
In some cases, the signal transmission that antenna is received to short-wave reception device analysis process when, have certain loss,
So it is accomplished by the signal in advance to receiving and compensates amplification, improves signal quality.Thus it is used for the amplifier that signal amplifies
Must possess low noise and High Linear ability, ensure that signal is undistorted after amplifying to the full extent.And in the prior art, its amplification
Device characteristic is generally single performance, or gain is big and IIP sections are low, or IIP sections meet and noise coefficient is not reached
It is required that, it is impossible to antenna small-signal is fully reduced or amplified.
The content of the invention
The technical problems to be solved by the invention are the defects for overcoming prior art, there is provided a kind of low noise high linear amplifies
Device, the null offset of rejective amplifier cascade improves stability of the amplifier by temperature change, reduces the non-thread of cascade amplifier
Property distortion.
In order to solve the above technical problems, the present invention provides a kind of low noise high linear amplifier, it is characterized in that, including difference
Cascaded amplification circuit and feedforward linear circuit, feedforward linear is connected to using differential cascade amplifying circuit as main and auxiliary amplifying device
In circuit；
The differential cascade amplifying circuit includes differential transformer T1, T2, earth resistance R1, R4, power supply Vc, Vb and crystal
Pipe circuit module, the transistor circuit module has symmetrical structure, including by electric capacity C1, C2, C3, resistance R2, R3, inductance
L1, L2, L3 and transistor Q1, Q2 constitute the same phase amplifying circuit that difference is put, and by electric capacity C1 ', C2 ', C3 ', resistance R2 ', R3 ',
Inductance L1 ', L2 ', L3 ' and transistor Q1 ', Q2 ' constitute the anti-phase amplifying circuit that difference is put；
T1 level Same Name of Ends series connection C3 of the differential transformer is followed by the base stage of Q1, and the emitter stage of Q1 is sequentially connected in series R3, R4
After be grounded, Q1 colelctor electrodes are divided into two-way by node, and the C2 that connects all the way first accesses the base stage of Q2, are further continued for L2 accesses of connecting downwards
The positive pole of power supply Vb, another road series connection L1 accesses the positive level of Vc, and the emitter stage of the Q2 is grounded after being sequentially connected in series R2, R1, Q2's
Colelctor electrode is divided into two-way by node, and the L3 that connects all the way is followed by the positive pole of Vc, and the secondary of the same name of T2 is accessed after another road series connection C1
End；The electric capacity C1 ', C2 ', C3 ', resistance R2 ', R3 ', inductance L1 ', L2 ', L3 ' and transistor Q1 ', Q2 ' are in annexation
Symmetrical based on earth resistance R1, R4, power supply Vc, Vb, difference is then T1 one end of level different name termination C3 ', and T2's is secondary different
Name termination C1 ' one end；The termination signal input part primary of the same name of T1, the primary termination signal output parts of the same name of T2.
The feedforward linear circuit is divided into two loops, including above-mentioned differential cascade amplifying circuit G1, G2, adjustable resistance
RT1, coupler M1, M2, M3, M4, delayer CF1, CF2, primary circuit are used to offset signal, and second level loop is used to eliminate misses
Difference, i.e. M1, G1, M2, RT1, M3, CF1 the composition first order loop, M2, CF2, M4, G2, M3, RT1 composition second level loop；
Signal Vi through coupler M1 inputs enter, be divided into two-way output, the positive pole that power supply Vc is met all the way of output end and
The input of G1, the output of G1 connects the input of M2, and M2 is divided into two branch roads again, and a series connection RT1 of coupled end accesses M3 couplings
End is closed, another series connection CF2 connects M4 output ends；Another road series connection CF1 of M1 output ends accesses M3 output ends, M3 input termination electricity
The positive pole of source Vc and the input of G2, the output end of G2 access M4 coupled ends, and the input of M4 connects output end vo.
Further, coupler M1, M2, M3, M4 uses 1:1 Double-wire parallel wound coil.
Further, the transistor Q1, Q2, Q1 ', Q2 ' use S9013NPN transistors.
Further, described power supply Vb, Vc are DC voltage, and its value is because of the pressure voltage less than transistor.
Further, the electric capacity uses polarity free capacitor, basis signal frequency characteristic value.
Further, the resistance R need to reach power more than 1206 Chip-Rs, and be precision resistance.
Further, described delayer CF1, CF2 be by lamped element real-time performance, using tunable capacitor and hollow line around
Inductance constitutes 11 rank Π types low-pass networks and carries out delay process to primary signal and main amplification output signal.
The beneficial effect that the present invention is reached：
The more amplifier element that amplifier of the invention has been used, increased power；Differential amplification has preferably linear
Degree and direct current biasing, the null offset of rejective amplifier cascade improve stability of the amplifier by temperature change, and with cascode electricity
Based on road is amplified, with larger voltage and current multiple, being cascaded by transistor increases multiplication factor, gives conjunction above thinking shape
Into differential cascade amplifying circuit.
Brief description of the drawings
Fig. 1 is differential cascade amplifying circuit of the invention；
Fig. 2 is feedforward linear circuit of the invention.
Specific embodiment
The invention will be further described below in conjunction with the accompanying drawings.Following examples are only used for clearly illustrating the present invention
Technical scheme, and can not be limited the scope of the invention with this.
As illustrated in fig. 1 and 2, a kind of low noise high linear amplifier, it is characterized in that, including differential cascade amplifying circuit and preceding
Feedback linear circuit, is connected to differential cascade amplifying circuit as main and auxiliary amplifying device in feedforward linear circuit；
The differential cascade amplifying circuit includes differential transformer T1, T2, earth resistance R1, R4, power supply Vc, Vb and crystal
Pipe circuit module, the transistor circuit module has symmetrical structure, including by electric capacity C1, C2, C3, resistance R2, R3, inductance
L1, L2, L3 and transistor Q1, Q2 constitute the same phase amplifying circuit that difference is put, and by electric capacity C1 ', C2 ', C3 ', resistance R2 ', R3 ',
Inductance L1 ', L2 ', L3 ' and transistor Q1 ', Q2 ' constitute the anti-phase amplifying circuit that difference is put；
T1 level Same Name of Ends series connection C3 of the differential transformer is followed by the base stage of Q1, and the emitter stage of Q1 is sequentially connected in series R3, R4
After be grounded, Q1 colelctor electrodes are divided into two-way by node, and the C2 that connects all the way first accesses the base stage of Q2, are further continued for L2 accesses of connecting downwards
The positive pole of power supply Vb, another road series connection L1 accesses the positive level of Vc, and the emitter stage of the Q2 is grounded after being sequentially connected in series R2, R1, Q2's
Colelctor electrode is divided into two-way by node, and the L3 that connects all the way is followed by the positive pole of Vc, and the secondary of the same name of T2 is accessed after another road series connection C1
End；
T1 level different name end series connection C3 ' of the differential transformer is followed by the base stage of Q1 ', and the emitter stage of Q1 ' is sequentially connected in series
It is grounded after R3 ', R4, Q1 ' colelctor electrodes are divided into two-way by node, the C2 ' that connects all the way first accesses the base stage of Q2 ', is further continued for downwards
Series connection L2 ' accesses the positive pole of power supply Vb, and another road series connection L1 ' accesses the positive level of Vc, the emitter stage of the Q2 ' be sequentially connected in series R2 ',
It is grounded after R1, the colelctor electrode of Q2 ' is divided into two-way by node, the L3 ' that connects all the way is followed by the positive pole of Vc, after another road series connection C1 '
Access the secondary different name end of T2；
The termination signal input part primary of the same name of T1, the primary termination signal output parts of the same name of T2.
The feedforward linear circuit is divided into two loops, including above-mentioned differential cascade amplifying circuit G1, G2, adjustable resistance
RT1, coupler M1, M2, M3, M4, delayer CF1, CF2, primary circuit are used to offset signal, and second level loop is used to eliminate misses
Difference, i.e. M1, G1, M2, RT1, M3, CF1 the composition first order loop, M2, CF2, M4, G2, M3, RT1 composition second level loop；
Signal Vi through coupler M1 inputs enter, be divided into two-way output, the positive pole that power supply Vc is met all the way of output end and
The input of G1, the output of G1 connects the input of M2, and M2 is divided into two branch roads again, and a series connection RT1 of coupled end accesses M3 couplings
End is closed, another series connection CF2 connects M4 output ends；Another road series connection CF1 of M1 output ends accesses M3 output ends, M3 input termination electricity
The positive pole of source Vc and the input of G2, the output end of G2 access M4 coupled ends, and the input of M4 connects output end vo.
In the present embodiment, coupler M1, M2, M3, M4 use 1:1 Double-wire parallel wound coil.
In the present embodiment, the transistor Q1, Q2, Q1 ', Q2 ' use S9013NPN transistors.
In the present embodiment, described power supply Vb, Vc are DC voltage, and its value is because of the pressure voltage less than transistor.
In the present embodiment, the electric capacity uses polarity free capacitor, basis signal frequency characteristic value.
In the present embodiment, the resistance R need to reach power more than 1206 Chip-Rs, and be precision resistance.
In the present embodiment, described delayer CF1, CF2 pass through lamped element real-time performance, using tunable capacitor and hollow line
Constitute 11 rank Π types low-pass networks around inductance carries out delay process to primary signal and main amplification output signal
In the present embodiment, the component relation of the signal in 2 of drawing is as described below.
Signal is by after main amplifier G1 amplifications, obtaining distortionless signal and amplifying voltage Avi and amplifier nonlinearity
The distortion voltage vd of generation.I.e.：
Vp=Avi+vd ... ... ... ... ... is 1.
Whole output voltages of main amplifier G1 make it decay to 1/A by an adjustable resistor, obtain va and are：
And the va after evanescent voltage is differed with primary signal voltage vi and obtained error voltage ve, substitute into formula and 2. obtain：
Then error voltage obtains output voltage veo and is after amplifying through auxiliary amplifier G2 again：
Veo=Ave=vd ... ... ... ... is 4.
Finally, the voltage veo of the output voltage vp of main amplifier and auxiliary amplifier G2 outputs obtains whole system after subtracting each other
Output voltage vo, substitute into formula 1. with formula 4.：
Vo=vp-veo=Avi ... ... ... ... ... is 5.
Feedforward linearized technology not only eliminates non-linear component, and the noise for also making main amplifier produce signal is also obtained
Preferable suppression is arrived.
" delayer " in Fig. 2 is realized by lamped element network, is constituted around inductance from tunable capacitor and hollow line
11 rank Π types low-pass networks carry out delay process to primary signal and main amplification output signal, so that defeated in improving amplifier loop
Enter the relative gain mismatch and relative phase mismatch (i.e. delay mismatches) to coupler, improve signal quality.
The above is only the preferred embodiment of the present invention, it is noted that for the ordinary skill people of the art
For member, on the premise of the technology of the present invention principle is not departed from, some improvement and deformation can also be made, these improve and deform
Also should be regarded as protection scope of the present invention.
Claims (7)
1. a kind of low noise high linear amplifier, it is characterized in that, including differential cascade amplifying circuit and feedforward linear circuit, by difference
Classification connection amplifying circuit is connected in feedforward linear circuit as main and auxiliary amplifying device；
The differential cascade amplifying circuit includes differential transformer T1, T2, earth resistance R1, R4, power supply Vc, Vb and transistor electricity
Road module, the transistor circuit module has a symmetrical structure, including by electric capacity C1, C2, C3, resistance R2, R3, inductance L1, L2,
L3 and transistor Q1, Q2 constitute the same phase amplifying circuit that difference is put, and by electric capacity C1 ', C2 ', C3 ', resistance R2 ', R3 ', inductance
L1 ', L2 ', L3 ' and transistor Q1 ', Q2 ' constitute the anti-phase amplifying circuit that difference is put；
T1 level Same Name of Ends series connection C3 of the differential transformer is followed by the base stage of Q1, and the emitter stage of Q1 is sequentially connected in series R3, R4 and is followed by
Ground, Q1 colelctor electrodes are divided into two-way by node, and the C2 that connects all the way first accesses the base stage of Q2, are further continued for L2 access power supplys of connecting downwards
The positive pole of Vb, another road series connection L1 accesses the positive level of Vc, and the emitter stage of the Q2 is grounded after being sequentially connected in series R2, R1, the current collection of Q2
Pole is divided into two-way by node, and the L3 that connects all the way is followed by the positive pole of Vc, and the secondary Same Name of Ends of T2 is accessed after another road series connection C1；Institute
Electric capacity C1 ', C2 ', C3 ' are stated, resistance R2 ', R3 ', inductance L1 ', L2 ', L3 ' and transistor Q1 ', Q2 ' are based in annexation
Earth resistance R1, R4, power supply Vc, Vb are symmetrical, and difference is then T1 one end of level different name termination C3 ', and T2 secondary different name end
Connect C1 ' one end；The termination signal input part primary of the same name of T1, the primary termination signal output parts of the same name of T2；
The feedforward linear circuit is divided into two loops, including above-mentioned differential cascade amplifying circuit G1, G2, adjustable resistance RT1, coupling
Clutch M1, M2, M3, M4, delayer CF1, CF2, primary circuit are used to offset signal, and second level loop is used to eliminate error, i.e.,
M1, G1, M2, RT1, M3, CF1 composition first order loop, M2, CF2, M4, G2, M3, RT1 composition second level loop；
Signal Vi enters through coupler M1 inputs, is divided into two-way output, the positive pole that power supply Vc is met all the way of output end and G1's
Input, the output of G1 connects the input of M2, and M2 is divided into two branch roads again, and a series connection RT1 of coupled end accesses M3 coupled ends,
Another series connection CF2 connects M4 output ends；Another road series connection CF1 of M1 output ends accesses M3 output ends, M3 input termination powers Vc
Positive pole and G2 input, the output end of G2 accesses M4 coupled ends, and the input of M4 connects output end vo.
2. a kind of low noise high linear amplifier according to claim 1, it is characterized in that, coupler M1, M2, M3, M4 are adopted
With 1:1 Double-wire parallel wound coil.
3. a kind of low noise high linear amplifier according to claim 1, it is characterized in that, the transistor Q1, Q2, Q1 ',
Q2 ' uses S9013NPN transistors.
4. a kind of low noise high linear amplifier according to claim 1, it is characterized in that, described power supply Vb, Vc are direct current
Voltage, its value is because of the pressure voltage less than transistor.
5. a kind of low noise high linear amplifier according to claim 1, it is characterized in that, the electric capacity uses nonpolarity electricity
Hold, basis signal frequency characteristic value.
6. a kind of low noise high linear amplifier according to claim 1, it is characterized in that, the resistance R need to reach 1206
Power more than Chip-R, and be precision resistance.
7. a kind of low noise high linear amplifier according to claim 1, it is characterized in that, described delayer CF1, CF2 lead to
Cross lamped element real-time performance, 11 rank Π types low-pass networks around inductance are constituted to primary signal using tunable capacitor and hollow line and
Main amplification output signal carries out delay process.
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| Application Number | Priority Date | Filing Date | Title |
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| CN201710190533.4A CN106849885B (en) | 2017-03-28 | 2017-03-28 | Low-noise high-linearity amplifier |
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| CN201710190533.4A CN106849885B (en) | 2017-03-28 | 2017-03-28 | Low-noise high-linearity amplifier |
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| CN106849885B CN106849885B (en) | 2023-11-21 |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612511A (en) * | 2017-08-21 | 2018-01-19 | 南京理工大学 | A kind of LTCC high stabilities ultra wide band balanced Low Noise Amplifier |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201039090Y (en) * | 2007-04-24 | 2008-03-19 | 福建三元达通讯有限公司 | Front feedback power amplification device for realizing self-adapted control based on pure hardware circuit |
| US20160182000A1 (en) * | 2014-12-18 | 2016-06-23 | Qualcomm Incorporated | Gain control in complementary common gate and common source amplifiers |
| CN206759399U (en) * | 2017-03-28 | 2017-12-15 | 常州无线电厂有限公司 | A kind of low noise high linear amplifier |
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2017
- 2017-03-28 CN CN201710190533.4A patent/CN106849885B/en active Active
Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN201039090Y (en) * | 2007-04-24 | 2008-03-19 | 福建三元达通讯有限公司 | Front feedback power amplification device for realizing self-adapted control based on pure hardware circuit |
| US20160182000A1 (en) * | 2014-12-18 | 2016-06-23 | Qualcomm Incorporated | Gain control in complementary common gate and common source amplifiers |
| CN206759399U (en) * | 2017-03-28 | 2017-12-15 | 常州无线电厂有限公司 | A kind of low noise high linear amplifier |
Non-Patent Citations (1)
| Title |
|---|
| 高强等: ""基于前馈结构的宽带高线性低噪声放大器"" * |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN107612511A (en) * | 2017-08-21 | 2018-01-19 | 南京理工大学 | A kind of LTCC high stabilities ultra wide band balanced Low Noise Amplifier |
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