CN106374858A - High-speed differential amplification circuit - Google Patents
High-speed differential amplification circuit Download PDFInfo
- Publication number
- CN106374858A CN106374858A CN201610897205.3A CN201610897205A CN106374858A CN 106374858 A CN106374858 A CN 106374858A CN 201610897205 A CN201610897205 A CN 201610897205A CN 106374858 A CN106374858 A CN 106374858A
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- Prior art keywords
- nmos pipe
- high speed
- speed differential
- source electrode
- differential amplifier
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- 230000003321 amplification Effects 0.000 title abstract description 14
- 238000003199 nucleic acid amplification method Methods 0.000 title abstract description 14
- 239000003990 capacitor Substances 0.000 abstract 4
- 238000010586 diagram Methods 0.000 description 8
- 238000000034 method Methods 0.000 description 5
- 230000008569 process Effects 0.000 description 4
- 229910044991 metal oxide Inorganic materials 0.000 description 3
- 150000004706 metal oxides Chemical class 0.000 description 3
- 239000004065 semiconductor Substances 0.000 description 3
- 230000009286 beneficial effect Effects 0.000 description 2
- 230000008859 change Effects 0.000 description 2
- 230000005611 electricity Effects 0.000 description 2
- 230000006872 improvement Effects 0.000 description 2
- 230000009471 action Effects 0.000 description 1
- 230000000295 complement effect Effects 0.000 description 1
- 230000003412 degenerative effect Effects 0.000 description 1
- 230000009467 reduction Effects 0.000 description 1
- 238000004513 sizing Methods 0.000 description 1
Classifications
-
- 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
- H03F3/45376—Differential amplifiers with semiconductor devices only characterised by the way of implementation of the active amplifying circuit in the differential amplifier using junction FET transistors as the active amplifying circuit
- H03F3/45394—Pl types
- H03F3/45399—Non-folded cascode stages
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
The invention discloses a high-speed differential amplification circuit which comprises a first NMOS tube, a second NMOS tube, a third NMOS tube, a fourth NMOS tube, a first capacitor, a second capacitor, a first current source and a second current source. The high-speed differential amplification circuit realizes amplification of a differential signal through a differential input pair transistor consisting of the first NMOS tube and the second NMOS tube and a differential output load consisting of the third NMOS tube and the fourth NMOS tube via the first capacitor and the second capacitor, is simple in structure, high in amplification performance, applicable to high-speed circuits, high in practicability and wide in application range. As the high-speed differential amplification circuit, the invention can be widely applied to the field of amplification circuits.
Description
Technical field
The present invention relates to amplifying circuit field, especially a kind of High Speed Differential Amplifier.
Background technology
Cmos device: refer to using CMOS technology (complementary metal
Oxide semiconductor) the plane type field three terminal device that manufactures, can be used to switch or amplify.Including p-type
Mos pipe and N-shaped mos pipe, so be referred to as CMOS technology.Also there is single p-type metal-oxide half
Semiconductor process and n-type metal oxide semiconductor technique, present is fewer.Generally include grid (gate), source electrode
(source) and drain electrode (drain) three ports.Grid typically plays control action.
Amplifying circuit, refers to input signal is carried out with the circuit of voltage or electric current or power amplification, and this amplification
Gain can be adjusted within the specific limits.The comparison of general chip internal voltage amplification is many, under certain characteristic frequency, the letter of output
The ratio of number scope and input signal is referred to as gain.With the increase of input signal, the amplifying power of general amplifier is posted
Drop under the influence of raw electric capacity etc..When input signal gain reduction to low-frequency gain 0.707 or reduce 3db when, this frequency
It is referred to as the bandwidth of this amplifier.Bandwidth is higher, and the frequency range that this amplifier can amplify signal is higher.Difference channel refers to input letter
Number it is differential signal, signal becomes big, and in addition one side signal diminishes, and vice versa.The output of difference channel can be single-ended
It can also be both-end difference.
General adjustable gain section amplifying circuit is as shown in figure 1, a variable resistance rs is connected on two nmos pipe m1 and m2
Source electrode in the middle of, play degenerative effect；Make gain can be approximately the ratio of the resistance between the drain electrode of mos pipe and source electrode；This
The linearity planting circuit is relatively good, and gain is the ratio of two resistance, more stable, does not change with process corner, and output loading is determined
Determine the bandwidth of this amplifying circuit, therefore this amplifying circuit is not suitable for being applied to high speed circuit, practicality is low, narrow application range.
Content of the invention
In order to solve above-mentioned technical problem, it is an object of the invention to provide a kind of stable high-speed-differential of amplification performance amplifies
Circuit.
The technical solution adopted in the present invention is: a kind of High Speed Differential Amplifier, including a nmos pipe, the 2nd nmos
Pipe, the 3rd nmos pipe, the 4th nmos pipe, the first electric capacity, the second electric capacity, the first current source and the second current source, described first
The grid of nmos pipe and the 2nd nmos pipe is respectively the first differential input end and second Differential Input of High Speed Differential Amplifier
End, the source electrode of a described nmos pipe, the source electrode of the 2nd nmos pipe pass through the first current source, the second current source ground connection, institute respectively
State the drain electrode of a nmos pipe, the drain electrode of the 2nd nmos pipe is connected with the source electrode of the 3rd nmos pipe, the source electrode of the 4th nmos pipe respectively
Connect, the grid of described 3rd nmos pipe, the grid of the 4th nmos pipe pass through first resistor respectively, second resistance connects power supply, institute
State the drain electrode of the 3rd nmos pipe, the drain electrode of the 4th nmos pipe connects power supply respectively, described first capacitance connection is managed in the 3rd nmos
Grid and source electrode between, described second capacitance connection between the grid and source electrode of the 4th nmos pipe, described first nmos pipe
Drain electrode and the drain electrode of the 2nd nmos pipe be respectively the first difference output end of High Speed Differential Amplifier and the second difference output
End.
Further, described High Speed Differential Amplifier also includes 3rd resistor, the source electrode of a described nmos pipe and
One end of three resistance connects, and the other end of described 3rd resistor is connected with the source electrode of the 2nd nmos pipe.
Further, described High Speed Differential Amplifier also includes the 3rd electric capacity, and described 3rd electric capacity is with 3rd resistor simultaneously
Connection.
The invention has the beneficial effects as follows: a kind of High Speed Differential Amplifier of the present invention passes through a nmos pipe and the 2nd nmos
The difference output load to pipe, the 3rd nmos pipe and the 4th nmos pipe composition for the Differential Input of pipe composition, in conjunction with the first electric capacity and
Second electric capacity is realized differential signal and is amplified, and not only circuit structure is simple, and amplification performance is well it is adaptable to high speed circuit, real
Strong with property, applied widely.
Brief description
Below in conjunction with the accompanying drawings the specific embodiment of the present invention is described further:
Fig. 1 is the circuit diagram of prior art；
Fig. 2 is a kind of circuit diagram of present invention High Speed Differential Amplifier embodiment one；
Fig. 3 is circuit diagram when a kind of High Speed Differential Amplifier of the present invention is actually used；
Fig. 4 is a kind of circuit diagram of present invention High Speed Differential Amplifier embodiment two；
Fig. 5 is a kind of circuit diagram of present invention High Speed Differential Amplifier embodiment three.
Specific embodiment
It should be noted that in the case of not conflicting, the embodiment in the application and the feature in embodiment can phases
Mutually combine.
Embodiment one
A kind of High Speed Differential Amplifier, with reference to Fig. 2, Fig. 2 is a kind of electricity of present invention High Speed Differential Amplifier embodiment one
Lu Tu, specifically, High Speed Differential Amplifier include a nmos pipe m1, the 2nd nmos pipe m2, the 3rd nmos pipe m3, the 4th
Nmos pipe m4, the first electric capacity c1, the second electric capacity c2, the first current source iw1 and the second current source iw2, a nmos pipe m1 and
The grid of two nmos pipe m2 is respectively the first differential input end inp and the second differential input end inn of High Speed Differential Amplifier,
The source electrode of the first nmos pipe m1, the source electrode of the 2nd nmos pipe m2 pass through the first current source iw1, the second current source iw2 ground connection respectively,
The drain electrode of the first nmos pipe m1, the 2nd nmos pipe m2 drain electrode respectively with the source electrode of the 3rd nmos pipe m3, the 4th nmos pipe m4
Source electrode connects, and the grid of the 3rd nmos pipe m3, the grid of the 4th nmos pipe m4 pass through first resistor r1, second resistance r2 even respectively
Meet power supply vaa, the drain electrode of the 3rd nmos pipe m3, the drain electrode of the 4th nmos pipe m4 connect power supply vaa respectively, the first electric capacity c1 connects
Between the grid and source electrode of the 3rd nmos pipe m3, the second electric capacity c2 is connected between grid and the source electrode of the 4th nmos pipe m4,
The drain electrode of the drain electrode of the first nmos pipe m1 and the 2nd nmos pipe m2 is respectively the first difference output end of High Speed Differential Amplifier
Outn and the second difference output end outp.
First nmos pipe m1 and the 2nd nmos pipe m2 be Differential Input to pipe, it is poor that the differential voltage signal of input is converted into
Divide electric current, the 3rd nmos pipe m3 and the 4th nmos pipe m4 is difference output load, and current signal is converted into voltage signal.This
Bright High Speed Differential Amplifier is not only simple in structure, and cost of implementation is low, and is applied to high speed circuit, specifically, says as follows
Bright:
With reference to Fig. 3, Fig. 3 is circuit diagram when a kind of High Speed Differential Amplifier of the present invention is actually used, and high-speed-differential amplifies electricity
When road connects load, as shown in figure 3, load capacitance cload1 and cload2 are connected to the first difference output end outn and ground
Between, between the second difference output end outp and ground.When low frequency, greatly, the 3rd nmos manages for the impedance of the first electric capacity c1
The voltage of m3 is connected on power supply vaa by first resistor r1, and the therefore the 3rd nmos pipe m3 forms the mos pipe that a diode connects,
The voltage of its grid and drain electrode is determined with flowing through its electric current by the pipe sizing of the 3rd nmos pipe m3.Due to the 3rd nmos pipe m3's
Direct grid current voltage is supply voltage, and the drain electrode DC voltage of the therefore the 3rd nmos pipe m3 or the DC voltage of output are automatically true
Fixed, the therefore output of High Speed Differential Amplifier does not need extra common mode feedback circuit to provide stable common-mode voltage, circuit
Structure is simple and cost is relatively low.Low-frequency gain is gm1/gm3, and wherein, gm1, gm3 are respectively a nmos pipe m1 and the 3rd nmos
The mutual conductance of pipe m3.When high frequency, the impedance of the first electric capacity c1 diminishes, and a part of output signal is fed back to the 3rd nmos by it
The grid of pipe m3 is it is ensured that ensure certain fixed pressure drop between the grid of the 3rd nmos pipe m3 and source electrode so that the 3rd nmos manages
The output current kept stable of m3, the signal code of a nmos pipe m1 is most of to flow into load, thus ensure that high frequency
When signal gain, high-frequency gain be gm1/cload1, wherein, gm1 is the mutual conductance of a nmos pipe m1, and cload1 is negative
Carry the capacitance of electric capacity cload1, therefore, the differential amplifier circuit of the present invention can apply to high speed circuit, not only amplification performance
Stable, and practicality is good.
Embodiment two
As the improvement further of the technical scheme of embodiment one, with reference to Fig. 4, Fig. 4 is a kind of high speed difference of the present invention to embodiment two
Divide the circuit diagram of amplifying circuit embodiment two, High Speed Differential Amplifier also includes 3rd resistor r3, the source of a nmos pipe m1
Pole is connected with one end of 3rd resistor r3, and the other end of 3rd resistor r3 is connected with the source electrode of the 2nd nmos pipe m2.Input signal
After the negative feedback of 3rd resistor r3, become the signal that comparison is linear, flows out from a nmos pipe m1 and the 2nd nmos pipe m2
Electric current is mainly the electric current after negative-feedback process, in the big situation of a nmos pipe m1 and the 2nd nmos pipe m2 bias current
Under, signal code is substantially equal to the resistance value divided by 3rd resistor r3 for the input voltage.Identical with embodiment one, high-speed-differential amplifies
Circuit connect load when, as shown in figure 3, load capacitance cload1 and cload2 be connected to the first difference output end outn with
Between ground, between the second difference output end outp and ground.
Embodiment three
As the improvement further of the technical scheme of embodiment two, with reference to Fig. 5, Fig. 5 is a kind of high speed difference of the present invention to embodiment three
Divide the circuit diagram of amplifying circuit embodiment three, High Speed Differential Amplifier also includes the 3rd electric capacity c3, the 3rd electric capacity c3 and the 3rd
Resistance r3 is in parallel., after the negative feedback of 3rd resistor r3 parallel connection the 3rd electric capacity c3, it is linear to become comparison for input signal, from the
The signal code that one nmos pipe m1 and the 2nd nmos pipe m2 flows out is mainly the electric current after negative-feedback process, in a nmos
Pipe m1 and the 2nd nmos pipe m2 bias current big in the case of, signal code is substantially equal to input voltage divided by 3rd resistor r3 simultaneously
Join the resistance value after the 3rd electric capacity c3.So negative feedback dies down when high frequency, and signal gain becomes big, is beneficial to promotion signal
Gain in high frequency.Identical with embodiment one, when High Speed Differential Amplifier connects load, as shown in figure 3, load capacitance
Cload1 and cload2 is connected between the first difference output end outn and ground, the second difference output end outp and ground
Between.
The difference that a kind of High Speed Differential Amplifier of the present invention passes through a nmos pipe m1 and the 2nd nmos pipe m2 composition is defeated
Enter the difference output load to pipe, the 3rd nmos pipe m3 and the 4th nmos pipe m4 composition, in conjunction with the first electric capacity c1 and the second electric capacity
C2 realizes differential signal and amplifies, and not only circuit structure is simple, and amplification performance is well it is adaptable to high speed circuit, practical,
Applied widely.
It is more than that the preferable enforcement to the present invention is illustrated, but the invention is not limited to described enforcement
Example, those of ordinary skill in the art also can make a variety of equivalent variations without prejudice on the premise of present invention spirit or replace
Change, these equivalent deformation or replacement are all contained in the application claim limited range.
Claims (3)
1. a kind of High Speed Differential Amplifier it is characterised in that include a nmos pipe, the 2nd nmos pipe, the 3rd nmos pipe, the
Four nmos pipes, the first electric capacity, the second electric capacity, the first current source and the second current source, a described nmos pipe and the 2nd nmos pipe
Grid be respectively the first differential input end of High Speed Differential Amplifier and the second differential input end, a described nmos pipe
Source electrode, the source electrode of the 2nd nmos pipe are grounded by the first current source, the second current source respectively, the drain electrode of a described nmos pipe,
The drain electrode of the 2nd nmos pipe is connected with the source electrode of the 3rd nmos pipe, the source electrode of the 4th nmos pipe respectively, described 3rd nmos pipe
Grid, the 4th nmos pipe grid respectively pass through first resistor, second resistance connect power supply, the drain electrode of described 3rd nmos pipe,
The drain electrode of the 4th nmos pipe connects power supply respectively, described first capacitance connection between the grid and source electrode of the 3rd nmos pipe, institute
State the second capacitance connection between the grid and source electrode of the 4th nmos pipe, the drain electrode of a described nmos pipe and the 2nd nmos pipe
Drain electrode is respectively the first difference output end and second difference output end of High Speed Differential Amplifier.
2. High Speed Differential Amplifier according to claim 1 is it is characterised in that also include 3rd resistor, and described first
The source electrode of nmos pipe is connected with one end of 3rd resistor, and the other end of described 3rd resistor is connected with the source electrode of the 2nd nmos pipe.
3. High Speed Differential Amplifier according to claim 2 is it is characterised in that also include the 3rd electric capacity, and the described 3rd
Electric capacity is in parallel with 3rd resistor.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610897205.3A CN106374858A (en) | 2016-10-14 | 2016-10-14 | High-speed differential amplification circuit |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201610897205.3A CN106374858A (en) | 2016-10-14 | 2016-10-14 | High-speed differential amplification circuit |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN106374858A true CN106374858A (en) | 2017-02-01 |
Family
ID=57896431
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN201610897205.3A Withdrawn CN106374858A (en) | 2016-10-14 | 2016-10-14 | High-speed differential amplification circuit |
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Cited By (4)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849884A (en) * | 2017-02-22 | 2017-06-13 | 成都芯源系统有限公司 | Signal amplification system and Hall detection amplification system thereof |
| CN110225425A (en) * | 2019-07-09 | 2019-09-10 | 深圳市中科蓝讯科技有限公司 | A kind of microphone input circuit |
| CN110677134A (en) * | 2019-10-22 | 2020-01-10 | 成都共源科技有限公司 | Self-adaptive bandwidth adjusting circuit |
| CN111312128A (en) * | 2020-02-26 | 2020-06-19 | 歌尔股份有限公司 | Drive circuit and digital light processing projector |
-
2016
- 2016-10-14 CN CN201610897205.3A patent/CN106374858A/en not_active Withdrawn
Cited By (6)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN106849884A (en) * | 2017-02-22 | 2017-06-13 | 成都芯源系统有限公司 | Signal amplification system and Hall detection amplification system thereof |
| CN106849884B (en) * | 2017-02-22 | 2020-07-14 | 成都芯源系统有限公司 | Signal amplification system and Hall detection amplification system thereof |
| CN110225425A (en) * | 2019-07-09 | 2019-09-10 | 深圳市中科蓝讯科技有限公司 | A kind of microphone input circuit |
| CN110677134A (en) * | 2019-10-22 | 2020-01-10 | 成都共源科技有限公司 | Self-adaptive bandwidth adjusting circuit |
| CN111312128A (en) * | 2020-02-26 | 2020-06-19 | 歌尔股份有限公司 | Drive circuit and digital light processing projector |
| CN111312128B (en) * | 2020-02-26 | 2023-08-29 | 歌尔光学科技有限公司 | Driving circuit and digital light processing projector |
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Application publication date: 20170201 |