CN103414439B - A kind of fully differential power current amplifier with noise-cancellation circuit - Google Patents
A kind of fully differential power current amplifier with noise-cancellation circuit Download PDFInfo
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- CN103414439B CN103414439B CN201310320120.5A CN201310320120A CN103414439B CN 103414439 B CN103414439 B CN 103414439B CN 201310320120 A CN201310320120 A CN 201310320120A CN 103414439 B CN103414439 B CN 103414439B
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Abstract
The invention discloses a kind of fully differential power current amplifier with noise-cancellation circuit, be made up of fully differential power current amplifier body and noise-cancellation circuit two parts.Wherein, described fully differential power current amplifier is constituted symmetrical differential configuration by two groups of identical Nullor, current parallel negative feedback network, series electric circuit negative feedback network, and wherein said series electric circuit negative feedback network is realized by transformer, current parallel negative feedback network is realized by single resistance；Described noise-cancellation circuit identical by two groups and that cascade successively noise current detection level, Current Voltage switching stage, Voltage to current transducer level and hybrid current synthesis level are constituted, and often organize the half of circuit of the corresponding above-mentioned fully differential power current amplifier of noise-cancellation circuit.The present invention can reduce the noise of transformer feedback network in fully differential power amplifier.
Description
Technical field
The invention belongs to Analogous Integrated Electronic Circuits technical field, be specifically related to one and there is noise support
The fully differential power current amplifier on electric eliminating road.
Background technology
The electric current that output signal is difference of fully differential power current amplifier, when it has sufficiently large
Gain time, can directly drive the switching stage of frequency mixer, save the transconductance stage of frequency mixer, thus
Forming a kind of novel RF front-end circuit, compared with the electric current of conventional radio frequency front end, this circuit has
Higher linearly, process consistency and robustness.
But, due in power current amplifier the noise contribution of feedback network relatively big (account for 20%,
See reference document [1]), when constituting symmetrical differential configuration, the noise of feedback network is the most correspondingly
Double, cause the noiseproof feature serious restriction by feedback network of whole amplifier.In order to reduce
Feedback network (especially current parallel negative-feedback net in fully differential power current low-noise amplifier
Network, as realized with transformer) noise contribution, the present invention propose one offset passive differential electricity
The method of stream the produced noise of Shunt negative feedback network.
There is no relevant document introduction at present, also do not search out relevant patent document.
Bibliography
[1]Xiaolong Li and Wouter A.Serdijn,“On the Design of Broadband
Power-to-Current Low Noise Amplifiers,”IEEE Transactions on
Circuits and Systems-I:Regular Papers, vol.59, no.3, pp.493-504, March
2012.
Summary of the invention
The purpose of the present invention is to be solved technical problem is that the defect existed for prior art, carries
For a kind of fully differential power current amplifier with noise-cancellation circuit.
In order to achieve the above object, the technical solution used in the present invention is:
A kind of fully differential power current amplifier with noise-cancellation circuit, including fully differential power
Current amplifier body, also includes noise-cancellation circuit, and described noise-cancellation circuit is by two knots
The counteracting branch road that structure is identical is constituted, and every counteracting branch road is all by the current detecting level cascaded successively, electricity
Stream-voltage switching stage, Voltage-current conversion level and hybrid current synthesis level are constituted；Signal source is respectively
With fully differential power current amplifier body and the input of the current detecting level of every counteracting branch road
Connect, the output of fully differential power current amplifier body respectively with the mixing of every counteracting branch road
The input of electric current synthesis level connects, and the output of the hybrid current synthesis level of every counteracting branch road divides
Do not connect load.
Described fully differential power current amplifier body is made up of the amplification branch road that two-strip structure is identical,
Every amplification branch road is all correspondingly arranged with counteracting branch road, and every amplification branch road is all by Nullor, electric current
Shunt negative feedback network, series electric circuit negative feedback network are constituted；Described current parallel negative feedback network
Being respectively first, second transformer, described series electric circuit negative feedback network is first, second resistance；
The Same Name of Ends of the primary coil of above-mentioned first transformer and the reversed-phase output of a Nullor are connected,
The Same Name of Ends of the secondary coil of the first transformer respectively with in-phase input end and the letter of a Nullor
Number source connects；The different name end of the first transformer is defeated with corresponding hybrid current synthesis level
Enter end to be connected, the different name end ground connection of the first transformer secondary coil；One end of first resistance connects the
The inverting input of one Nullor and in-phase output end.
The Same Name of Ends of the primary coil of above-mentioned second transformer and the reversed-phase output phase of the 2nd Nullor
Even, the Same Name of Ends of the secondary coil of the second transformer respectively with the in-phase input end of the 2nd Nullor with
And signal source connects；The different name end of the second transformer synthesizes level with corresponding hybrid current
Input be connected, the different name end ground connection of the second transformer secondary coil；One end of second resistance is even
Connect inverting input and the in-phase output end of the 2nd Nullor；The other end phase of first, second resistance
Connect.
Described current detecting level uses current sensor or integrated transformer.
Described hybrid current synthesis level uses current adder or subtracter.
Described current-voltage switching stage uses passive or active current-voltage conversion circuit.
A kind of fully differential power current amplifier with noise-cancellation circuit of the present invention has as follows
Advantage and beneficial effect:
1. due to the one of the present invention has fully differential power current amplifier can be in parallel with cancellation current
The noise of negative feedback network, therefore can reduce the current parallel negative feedback network noise to amplifier
Contribution, thus improve the noiseproof feature of whole amplifier.
2. due to the one of the present invention, there is the inspection of fully differential its noise-cancellation circuit of power current amplifier
Survey and process is the current signal of difference, and therefore the introducing of noise-cancellation circuit does not interferes with original error
Divide the topological structure of power current amplifier.
3. due to the one of the present invention, there is its noise-cancellation circuit structure of fully differential power current amplifier
Becoming symmetrical differential configuration, therefore the hybrid current in its two symmetry synthesizes the information signal of level output
After superposition, while improving gain, maintain higher common-mode rejection ratio, process consistency and Shandong
Rod.
Accompanying drawing explanation
Fig. 1 is the principle schematic of the present invention.
Fig. 2 be Fig. 1 implement schematic diagram.
In Fig. 1 and Fig. 2: 10,20. current detecting level, 11,21. current-voltage switching stages 12,
22. Voltage-current conversion levels, 13,23. hybrid currents synthesis levels, 30,40.Nullor, 31,41.
Transformer.
Detailed description of the invention
In order to deepen the understanding of the present invention, below in conjunction with embodiment and accompanying drawing, the present invention is made into one
The detailed description of step.
A kind of fully differential power current amplifier with noise-cancellation circuit as shown in Figure 1, by
Fully differential power current amplifier body and noise-cancellation circuit two parts are constituted.Wherein, described
Fully differential power current amplifier body is by two groups of identical Nullor, current parallel negative-feedback
Network, series electric circuit negative feedback network constitute symmetrical differential configuration, and wherein said electric current string
Connection negative feedback network is realized by transformer, and current parallel negative feedback network is realized by single resistance；
Described noise-cancellation circuit noise current that is identical by two groups and that cascade successively detects level, electricity
Stream-voltage switching stage, Voltage-current conversion level and hybrid current synthesis level are constituted, and often organize noise
The half of circuit of the corresponding above-mentioned fully differential power current amplifier of bucking circuit.
Above-mentioned current detecting level 10,20, current-voltage switching stage 11,21, voltage-to-current turns
Changing level 12,22 and Nullor 30,40 and be four port networks, i.e. they respectively have two inputs
Port and two output ports；Above-mentioned current parallel negative feedback network is by first, second transformation
Device 31,41 realizes, and above-mentioned series electric circuit negative feedback network is by first, second resistance 32,42
Constituting, above-mentioned hybrid current synthesis level 13,23 is five-port network, and two of which is output
Port, three be input port, and public affairs that one of them input port is other two input ports
End altogether.
Described current parallel negative feedback network is respectively first, second transformer 31,41, described electricity
Stream series negative feedback network is first, second resistance 32,42, at the beginning of above-mentioned first transformer 31
The Same Name of Ends of level coil and the reversed-phase output of a Nullor30 are connected, the first transformer 31
The Same Name of Ends of primary coil is connected with in-phase input end and the signal source of a Nullor30 respectively；
The Same Name of Ends of the first transformer 31 secondary coil synthesizes the input phase of level with corresponding hybrid current
Even, the different name end ground connection of the first transformer 31 secondary coil；One end of first resistance 32 connects the
The inverting input of one Nullor30 and in-phase output end；
The 2nd above-mentioned Nullor the 40, second transformer 41 and a described Nullor 30,
One transformer 31 one_to_one corresponding and connected mode are consistent.
The concrete connected mode of described noise-cancellation circuit is: above-mentioned current detecting level 10, electricity
Stream-voltage switching stage 11, Voltage-current conversion level 12, hybrid current synthesis level 13 cascades successively,
Two outputs of the most described current detecting level 10 and two inputs of described current-voltage switching stage 11
It is connected, the output of described current-voltage switching stage 11 and described Voltage-current conversion level 12
Input is connected, and the output of described Voltage-current conversion level 12 synthesizes level with described hybrid current
The input of 13 is connected, and one of them input port of described hybrid current synthesis level 13 is public
End, ground connection altogether；One of them output port of above-mentioned hybrid current synthesis level 13 and the one of load
End is connected, another output port ground connection.
Above-mentioned current detecting level 20, current-voltage switching stage 21, Voltage-current conversion level 22,
The connected mode of hybrid current synthesis level 23 and above-mentioned current detecting level 10, current-voltage switching stage
11, Voltage-current conversion level 12, hybrid current synthesis level 13 one_to_one corresponding and connected mode are consistent.
Concrete connected mode between above-mentioned fully differential power current amplifier and noise-cancellation circuit
Be: in described noise-cancellation circuit the input of current detecting level 10/20 respectively with the one of signal source
The homophase input of the Nullor 30/40 in individual differential input end and described differential power current amplifier
End is connected；The different name end of transformer 31/41 described in described fully differential power current amplifier and institute
One input port of residue stating noise-cancellation circuit hybrid current synthesis level 13/23 is connected.
Above-mentioned Voltage-current conversion level can use passive or active current/charge-voltage convertor
Realize.
Above-mentioned hybrid current synthesis level can be subtracted by the electric current of current adder or difference output
Musical instruments used in a Buddhist or Taoist mass realizes.
Fig. 2 is a kind of fully differential power current amplifier with noise-cancellation circuit shown in Fig. 1
Be embodied as circuit diagram.Nullor 30 in Fig. 1 is in fig. 2 by transistor VF301, VF302
The dual-stage amplifier constituted with VF303 realizes, and wherein its input stage is by commonsource amplifier VF301
Composition, its output stage is made up of fully-differential amplifier VF302 and VF303；Nullor in Fig. 1
The dual-stage amplifier that 40 are made up of transistor VF401, VF402 and VF403 in fig. 2 realizes,
Wherein its input stage is made up of commonsource amplifier VF401, and its output stage is by fully-differential amplifier
VF402 and VF403 forms.In Fig. 1, two transformers 31,41 are 1:N by turn ratio
Integrated transformer realize, the most respectively with TF311 and TF411 indicate.In Fig. 1 single
Resistance in fig. 2 by the resistance R that two resistances are R/2221、R211It is in series.In Fig. 1
Current detecting level 10,20 realized by integrated transformer that turn ratio is 1:1, divide in fig. 2
Yong TF101, TF201 not indicate.Current-voltage switching stage 11 in Fig. 1 is by the R in Fig. 2111
Realize；Current-voltage switching stage 21 in Fig. 1 is by the R in Fig. 2211Realize, the electricity in Fig. 1
Piezo-electric stream switching stage 12 and hybrid current synthesis level 13 are constituted (figure by VF121 in fig. 2
Middle VF121/VF131 indicates), Voltage-current conversion level 22 and hybrid current in Fig. 1 close
Staged 23 is constituted (indicating in figure) with VF221/VF231 by VF221 in fig. 2, wherein
Resistance R121、R122And R221、R222It is respectively VF121/VF131 and VF221/VF231 to provide
Bias voltage.
There is the substantially workflow of the fully differential power current amplifier of noise-cancellation circuit:
Power signal (the u of differencein+, uin-and iin+, iin-) input to TF101 and TF201
Primary coil, the current signal that its secondary coil different name end detects is respectively through resistance R111And R211
Being converted to voltage, this voltage signal is through mutual conductance amplifying stage VF121/VF131 and VF221/VF231
Be converted to after amplification export electric current；Meanwhile, the electricity of the primary coil output of TF101/TF201
Stream signal is converted to export electric current through mutual conductance amplifying stage VF301/VF401, at nodes X and Z
The polarity of information voltage signal is identical, but the opposite polarity of the information voltage signal with node Y；?
The polarity of the noise voltage signal of node Z with Y is identical, but with the noise voltage signal of nodes X
Opposite polarity.Therefore, in the information of input of VF121/VF131 and VF221/VF231
Signal is due to opposite polarity, Signal averaging, but the noise voltage signal polarity of input is identical, mutually
Offset, it is achieved that the function of noise cancellation.The single-ended signal of the drain electrode output of VF301 is simultaneously simultaneously
Couple directly to the grid of VF302 and VF303, by the signal of the drain electrode output of VF401 then
Couple directly to the grid of VF402 and VF403 simultaneously.Defeated by the drain electrode of VF302 and VF402
The current signal gone out is respectively by electric capacity C321And C421It is respectively coupled to the source of VF301 and VF401
Pole, the source electrode of VF301 and VF401 is each the resistance R of R/2 with two resistances321、R421's
One end is connected.By VF303 and VF403 drain electrode output current signal respectively with transformer
TF311 is connected with the Same Name of Ends of transformer TF411 primary coil, and its different name end is the most respectively through coupling
Close electric capacity C3 and C4 to be connected to load (ZL) two ends.I.e. by the leakage of VF303 and VF403
The differential current signal of pole output flows through primary coil and the coupling electric capacity C3 of TF311 and TF411
After C4, the output current signal (i of differenceO-, iO+) flow into load ZL, it is achieved that the poorest
Divide the function of power current amplifier amplified difference signal.TF311 and TF411 secondary coil same
Name end is connected with the grid of VF301 and VF401 the most respectively, and its different name end is then connected to
One voltage source U that direct current biasing is provided for gridGG。
Table 1 is that in Fig. 2, tri-nodes of X, Y, Z are to induction signal and the polarity of noise, and signal is made an uproar
The process that sound is offset.
Table 1
Mirror current source VF304 in Fig. 2, VF305, VF306, VF307, VF404, VF405,
And R302、R303、R403、R402And R401For transistor VF301, VF302, VF303,
VF401, VF402, VF403 provide bias current.
Claims (4)
1. there is a fully differential power current amplifier for noise-cancellation circuit, including fully differential merit
Rate current amplifier body, is characterized in that: also include noise-cancellation circuit, described noise cancellation
Circuit is made up of the counteracting branch road that two-strip structure is identical, and every counteracting branch road is all by the electric current cascaded successively
Detection level, current-voltage switching stage, Voltage-current conversion level and hybrid current synthesis level are constituted；
Signal source respectively with fully differential power current amplifier body and the current detecting of every counteracting branch road
Level input connect, the output of fully differential power current amplifier body respectively with every counteracting
The input of the hybrid current synthesis level of branch road connects, the hybrid current synthesis level of every counteracting branch road
Output connect load respectively；Described fully differential power current amplifier body is identical by two-strip structure
Amplification branch road constitute, every amplification branch road all with offset branch road and be correspondingly arranged, every amplification branch road
All it is made up of Nullor, current parallel negative feedback network, series electric circuit negative feedback network；Described electricity
Stream Shunt negative feedback network is respectively first, second transformer (31,41), described current-series
Negative feedback network is first, second resistance (32,42)；At the beginning of above-mentioned first transformer (31)
The Same Name of Ends of level coil and the reversed-phase output of a Nullor (30) are connected, the first transformer (31)
Secondary coil Same Name of Ends respectively with in-phase input end and the signal source of a Nullor (30)
Connect；The different name end of the first transformer (31) primary coil and corresponding hybrid current synthesis level
Input is connected, the different name end ground connection of the first transformer (31) secondary coil；First resistance (32)
One end connect the inverting input of a Nullor (30) and in-phase output end；Described second becomes
The Same Name of Ends of the primary coil of depressor (41) and the reversed-phase output of the 2nd Nullor (40) are connected,
The Same Name of Ends of the secondary coil of the second transformer (41) respectively with the homophase of the 2nd Nullor (40)
Input and signal source connect；The different name end of the second transformer (41) primary coil is with corresponding
The input of hybrid current synthesis level is connected, the different name termination of the second transformer (41) secondary coil
Ground；One end of second resistance (42) connects inverting input and the homophase of the 2nd Nullor (40)
Output；The other end of first, second resistance (32,42) is connected with each other.
A kind of fully differential power current with noise-cancellation circuit the most according to claim 1
Amplifier, is characterized in that: described current detecting level uses current sensor or integrated transformer.
A kind of fully differential power current with noise-cancellation circuit the most according to claim 1
Amplifier, is characterized in that: described hybrid current synthesis level uses current adder or subtracter.
A kind of fully differential power current with noise-cancellation circuit the most according to claim 1
Amplifier, is characterized in that: described current-voltage switching stage uses passive or active electric current-electricity
Voltage conversion circuit.
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| CN103490736A (en) * | 2013-08-29 | 2014-01-01 | 苏州苏尔达信息科技有限公司 | Four-port differential amplification circuit |
| CN115800939A (en) * | 2022-11-23 | 2023-03-14 | 德氪微电子(深圳)有限公司 | Differential amplifier circuit and electronic equipment |
Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277095A (en) * | 2007-03-26 | 2008-10-01 | 三星电子株式会社 | Fully differential class AB amplifier and amplifying method using single-ended, two-stage amplifier |
| CN102651633A (en) * | 2012-05-15 | 2012-08-29 | 江苏科技大学 | Noise current feed-forward type noise cancellation circuit |
| CN102651635A (en) * | 2012-05-15 | 2012-08-29 | 江苏科技大学 | Fully differential power current amplifier |
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| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| JP5517725B2 (en) * | 2009-05-15 | 2014-06-11 | キヤノン株式会社 | Fully differential amplifier circuit |
| KR101153568B1 (en) * | 2009-11-02 | 2012-06-11 | 삼성전기주식회사 | Multi-stage cmos power amplifier |
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Patent Citations (3)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN101277095A (en) * | 2007-03-26 | 2008-10-01 | 三星电子株式会社 | Fully differential class AB amplifier and amplifying method using single-ended, two-stage amplifier |
| CN102651633A (en) * | 2012-05-15 | 2012-08-29 | 江苏科技大学 | Noise current feed-forward type noise cancellation circuit |
| CN102651635A (en) * | 2012-05-15 | 2012-08-29 | 江苏科技大学 | Fully differential power current amplifier |
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