CN206698188U - The amplifier of low-voltage high linearity - Google Patents
The amplifier of low-voltage high linearity Download PDFInfo
- Publication number
- CN206698188U CN206698188U CN201720101049.5U CN201720101049U CN206698188U CN 206698188 U CN206698188 U CN 206698188U CN 201720101049 U CN201720101049 U CN 201720101049U CN 206698188 U CN206698188 U CN 206698188U
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- amplifier
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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
- H03F1/32—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
- 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
- H03F3/45179—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using MOSFET transistors as the active amplifying circuit
Abstract
A kind of amplifier of low-voltage high linearity.The amplifier in uses complementary mutual conductance CMOS tube, and sets independent bias circuit respectively for two metal-oxide-semiconductors of CMOS tube.In the case where supply voltage is less than the two single tube threshold voltages for arriving three times, the amplifier can also provide big output voltage swing, high-gain, high linearity.Under larger mains voltage variations, the gain of the amplifier, operating current, mutual conductance, output impedance are all highly stable.
Description
Technical field
The utility model belongs to technical field of integrated circuits, and in particular to a kind of amplifier electricity of low-voltage high linearity
Road.
Background technology
In broadband application field, amplifier has while resistive load it is desirable that working power voltage is less than two arrives
The single tube threshold voltage of three times.Design, which can provide big output voltage swing, high-gain, the amplifier of high linearity, has very big choose
War.
In currently available technology, more using single tube ohmic load common-source amplifier, amplifier and difference based on reverser
The amplifiers such as amplifier of the form-separating based on reverser.
However, for the front-end amplifier for driving broadband A/D C, its voltage output amplitude of oscillation has to the full amount than ADC
Cheng Yao great, and its linearity can compare or the linearity higher than ADC ensures the linearity of total system.Its output
Typically all selection is biased in the center between power supply and ground.
For long raceway groove technique, breakdown voltage and supply voltage are all sufficiently large, and the limitation of voltage margin is herein not
It is vital issue.Device linearity degree is mainly determined by the characteristic of bias condition and input device.But to low breakdown
For the ultrashort channel technique of voltage and supply voltage, conclusion above is not correct.To the typical case in 45nm CMOS technologies
The linearity research of transistor finds that the linearity is mainly by the conditional decision of output port, especially voltage margin.
Utility model content
The purpose of this utility model is to overcome existing technical deficiency, there is provided a kind of amplifier electricity of low-voltage high linearity
Road.
Above-mentioned purpose of the present utility model is achieved by the following technical solution：A kind of amplification of low-voltage high linearity
Device, including input and output end, wherein amplifier include CMOS inverter, and CMOS inverter is by the first p-type MOS and
Two N-type MOS are formed；And input is connected with the first p-type MOS the first G poles and the second N-type MOS the 2nd G poles respectively.It is defeated
Entering between end and the first G poles has electric capacity, and has electric capacity between input and the 2nd G poles；Wherein the first p-type MOS is by
One biasing circuit provides the first bias current.Second N-type MOS provides the second bias current by the second biasing circuit.
That is, amplifier of the present utility model uses complimentary CMOS transistors in input.First p-type MOS and the 2nd N types
MOS is that mutual conductance pipe and being respectively adopted is loaded into mutually using independent bias technology, input end signal using capacitive coupling
Mend on mutual conductance pipe.
Further, the first biasing circuit and the second biasing circuit use current mirror form.
Further, input is connected via capacitance resistance series circuit with output end, therefore input and output terminal impedance can lead to
The capacitance resistance series circuit is crossed to adjust；
The output end of amplifier has common mode feedback circuit, and common mode feedback circuit is with the output voltage of output end and with reference to electricity
Press and exported for input signal, the common-mode feedback of common mode feedback circuit by providing electric current for the first p-type MOS and the second N-type MOS
Compensate to adjust the direct current output of the amplifier.
Specifically, above-mentioned current compensation can be the current source that is connected with amplifier out of adjustment, for for the first p-type
MOS and the second N-type MOS provides pull-up current or pull-down current fine setting.Common-mode feedback can also be directly output to the first p-type
MOS and/or the second N-type MOS is to adjust the first p-type MOS and/or the second N-type MOS DC operation states.
In the case where supply voltage is less than the two single tube threshold voltages for arriving three times, the amplifier can also provide big output pendulum
Width, high-gain, high linearity.Under larger mains voltage variations, gain, operating current, mutual conductance, the output resistance of the amplifier
It is anti-all highly stable.
Brief description of the drawings
Fig. 1 shows the amplifier theory scheme for the low-voltage high linearity that the utility model is proposed；
Fig. 2 shows that the common mode feedback circuit output in amplifier of the present utility model feeds back to the embodiment party of p-type metal-oxide-semiconductor
Method；
Fig. 3 shows that the common mode feedback circuit output in amplifier of the present utility model feeds back to the embodiment party of N-type metal-oxide-semiconductor
Method；
Fig. 4 (A) and Fig. 4 (B) shows the single tube ohmic load common-source amplifier of prior art；
Fig. 5 (A) and Fig. 5 (B) shows the conventional amplifier based on reverser of prior art；
Fig. 6 shows the amplifier according to the low-voltage high linearity of the present utility model formed with difference form；
Fig. 7 shows the amplifier based on reverser of the difference form of prior art；
Fig. 8 shows the difference amplifier of amplifier composition of the present utility model compared with the gain of conventional differential amplifier；
Fig. 9 shows the mutual conductance and output of the difference amplifier and conventional differential amplifier of amplifier composition of the present utility model
Impedance with mains voltage variations comparison；
Figure 10 shows the difference amplifier of amplifier composition of the present utility model and the 1dB compression points of conventional differential amplifier
The comparison of change.
Embodiment
The utility model proposes low-voltage high linearity amplifier architecture as shown in figure 1, its have input IN with
And output end OUT, the core of the amplifier circuit are two based on the CMOS inverter being made up of two metal-oxide-semiconductors MP, MN
Metal-oxide-semiconductor MP, MN act as mutual conductance pipe.Input signal is coupled on two MOS pipes MP, MN by exchange way, therefore, defeated
Enter to hold IN to be connected respectively via electric capacity C1, C2 with two metal-oxide-semiconductors MP, MN G poles.
In amplifier of the present utility model, two metal-oxide-semiconductors are biased by independent reference current source respectively, specifically,
Metal-oxide-semiconductor MP provides bias current by the first biasing circuit including current source 1, and metal-oxide-semiconductor MN is inclined by second including current source 2
Circuits provide bias current.First biasing circuit and the second biasing circuit have the form of current mirror.
Can also be via the electric capacity C3 and resistance Rf series circuits formed and output end between input IN and output end OUT
Connection.The input/output terminal that feedback resistance is added to circuit can be used for adjustment circuit gain and input and output terminal impedance.
In the amplifier for the low-voltage high linearity that the utility model shown in Fig. 1 is proposed, output end OUT also has
One auxiliary circuit, the auxiliary circuit have the auxiliary current source array and common mode feedback circuit that metal-oxide-semiconductor MPx, MNx are formed
CMFB, and common mode feedback circuit CMFB is using output end OUT output voltage and reference voltage V_ref as input signal.In Fig. 1
In shown circuit, the output of common mode feedback circuit is connected directly to the input of metal-oxide-semiconductor MPx, MNx as auxiliary current source array
Signal, the output end of the auxiliary current source array are connected with the output end OUT of the utility model amplifier, for for described
One p-type MOS and the second N-type MOS provide current compensation, that is, can compensate for MOS pipe MP, MN pipes pull-up current and under
Sourcing current, and can be used in regulation output voltage to reference voltage V_ref.Reference voltage V_ref should be arranged on VDD/2
To reach maximum output voltage swing.
Fig. 2 and Fig. 3 shows that the output of common mode feedback circuit is added to different nodes and carrys out two modifications implementations of regulation direct-current bias
Example, wherein Fig. 2 show that the common mode feedback circuit output in amplifier of the present utility model feeds back to the implementation of p-type metal-oxide-semiconductor,
Fig. 3 shows that common mode feedback circuit output feeds back to the implementation of N-type metal-oxide-semiconductor, although loop bandwidth and linear may be brought
Degree negative effect, above-mentioned modified example can equally realize the purpose of this utility model.
Below, amplifier of the present utility model with the comparative descriptions of prior art improvement and advantage will be passed through.
Compared with the single tube ohmic load common-source amplifier shown in Fig. 4 (A) and Fig. 4 (B), the utility model can be connect
The higher gain of nearly transistor intrinsic property.Under same current offset, bigger mutual conductance can be obtained.Also, avoid
Excessive voltage margin is consumed on the load resistance of single tube ohmic load common-source amplifier.
Compared with the amplifier based on reverser shown in Fig. 5 (A) and Fig. 5 (B), output bias voltage of the present utility model
All the time on optimal current potential, bigger output voltage swing can be obtained.And bias current is with mains voltage variations,
More stable and predictable gain and the linearity can be obtained.Therefore, amplifier of the present utility model can be operated in lower
Under supply voltage.
Fig. 6 shows the amplifier of the low-voltage high linearity formed according to amplifier of the present utility model with difference form,
Wherein common mode feedback circuit is omitted.Fig. 7 shows the difference amplifier of prior art.Below will be by more of the present utility model
The gain of the difference amplifier of amplifier composition and the difference amplifier of prior art, operating current, mutual conductance, output impedance, 1dB
Compression point etc. with the change of external condition come illustrate amplifier of the present utility model in actual circuit application it is achieved
Beneficial effect.
Fig. 8 show amplifier of the present utility model composition difference amplifier (it is lower to be referred to as " the application ", in figs. 8-10 with
Solid line represents its characteristic) with the conventional difference form of an example based on reverser amplifier (it is lower be referred to as " routine ", Fig. 8-
Its characteristic is represented by dotted lines in 10) gain and operating current change comparison.Wherein when supply voltage is less than 0.8V, often
The gain of rule technical scheme drastically declines, application scheme change in gain very little.When supply voltage is higher than 1V, routine techniques side
The electric current of case increased dramatically, the utility model curent change very little.
Fig. 9 shows the comparison of the mutual conductance and output impedance change of the utility model and conventional techniques.Wherein with electricity
The increase of source voltage, very greatly, mutual conductance of the present utility model is highly stable for the mutual conductance change of conventional techniques.Conventional techniques
Output impedance change very greatly, output impedance of the present utility model is highly stable.
Figure 10 shows that the 1dB compression points of the utility model and conventional techniques change.Wherein in different integrated circuit works
Under skill angle, the 1dB compression points of conventional techniques have changed 0.8dB, and 1dB compression points of the present utility model have only changed 0.3dB,
Performance is more stable.
Finally it is pointed out that above only illustrating implementer's case of the present utility model rather than limitation.This
The technical staff in field should be understood that on the premise of the spirit and scope of the utility model of appended claims is not departed from, can
Various change, appended claims cover all in the spirit and scope of the utility model in existence form and in details
These change and modification.
Claims (8)
1. a kind of amplifier of low-voltage high linearity, including input and output end, it is characterised in that
The amplifier includes complementary cmos mutual conductance pipe, and the complementary cmos mutual conductance pipe is by the first p-type MOS and the second N-type MOS groups
Into；And
The input is connected with the first G poles of the first p-type MOS and the 2nd G poles of the second N-type MOS respectively, described
There is electric capacity between input and the first G poles, and there is electric capacity between the input and the 2nd G poles；Wherein
The first p-type MOS provides the first bias current by the first biasing circuit.
2. amplifier as claimed in claim 1, it is characterised in that
The second N-type MOS provides the second bias current by the second biasing circuit.
3. amplifier as claimed in claim 2, it is characterised in that
First biasing circuit and second biasing circuit use current mirror form.
4. amplifier as claimed in claim 1, it is characterised in that
The input is connected via capacitance resistance series circuit with the output end.
5. amplifier as claimed in claim 1, it is characterised in that
The output end of the amplifier has common mode feedback circuit, and the common mode feedback circuit is with the output voltage of the output end
It is input signal with reference voltage, the common-mode feedback of the common mode feedback circuit, which exports, to be used for for the first p-type MOS and institute
State the second N-type MOS and current compensation is provided.
6. amplifier as claimed in claim 5, it is characterised in that
The current compensation is used to provide pull-up current or pull-down current for the first p-type MOS and the second N-type MOS.
7. amplifier as claimed in claim 5, it is characterised in that
Further comprise the auxiliary current source array being made up of the 3rd p-type MOS and the 4th N-type MOS, the common-mode feedback output is made
For the input signal of the auxiliary current source array, the auxiliary output terminal of the auxiliary current source array is connected to the amplifier
Output end.
8. amplifier as claimed in claim 5, it is characterised in that
The common-mode feedback is exported to the first p-type MOS and/or the second N-type MOS to adjust the first p-type MOS
And/or the second N-type MOS DC operation states.
Applications Claiming Priority (2)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN2016213842089 | 2016-12-16 | ||
| CN201621384208 | 2016-12-16 |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN206698188U true CN206698188U (en) | 2017-12-01 |
Family
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Family Applications (2)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710060238.7A Pending CN108206676A (en) | 2016-12-16 | 2017-01-24 | The amplifier of low-voltage high linearity |
| CN201720101049.5U Active CN206698188U (en) | 2016-12-16 | 2017-01-24 | The amplifier of low-voltage high linearity |
Family Applications Before (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201710060238.7A Pending CN108206676A (en) | 2016-12-16 | 2017-01-24 | The amplifier of low-voltage high linearity |
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| CN (2) | CN108206676A (en) |
Families Citing this family (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN112398448B (en) * | 2020-10-30 | 2021-08-17 | 锐石创芯（深圳）科技有限公司 | Radio frequency differential amplification circuit and radio frequency module |
-
2017
- 2017-01-24 CN CN201710060238.7A patent/CN108206676A/en active Pending
- 2017-01-24 CN CN201720101049.5U patent/CN206698188U/en active Active
Also Published As
| Publication number | Publication date |
|---|---|
| CN108206676A (en) | 2018-06-26 |
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| GR01 | Patent grant | ||
| GR01 | Patent grant | ||
| CP03 | Change of name, title or address |
Address after: Room 1101-22, building a, building 4, Nanjing Baixia hi tech Industrial Development Zone, No.6 Yongzhi Road, Qinhuai District, Nanjing City, Jiangsu Province Patentee after: Jiangsu hairuida Microelectronics Technology Co.,Ltd. Address before: No.188 Tongsheng Avenue, Nantong Development Zone, Nantong City, Jiangsu Province 226200 Patentee before: JIANGSU ANQIWEI MICROELECTRONICS TECHNOLOGY CO.,LTD. |
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| CP03 | Change of name, title or address | ||
| TR01 | Transfer of patent right |
Effective date of registration: 20220311 Address after: 201210 building 02, building 51, No. 1387, Zhangdong Road, Pudong New Area, Shanghai Patentee after: SHANGHAI ARCHIWAVE ELECTRONIC TECHNOLOGY CO.,LTD. Address before: Room 1101-22, building a, building 4, Nanjing Baixia hi tech Industrial Development Zone, No.6 Yongzhi Road, Qinhuai District, Nanjing City, Jiangsu Province Patentee before: Jiangsu hairuida Microelectronics Technology Co.,Ltd. |
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| TR01 | Transfer of patent right |