CN108900168A - The collapsible difference that output end can increase output voltage swing turns single-ended amplifier - Google Patents
The collapsible difference that output end can increase output voltage swing turns single-ended amplifier Download PDFInfo
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- CN108900168A CN108900168A CN201810675009.0A CN201810675009A CN108900168A CN 108900168 A CN108900168 A CN 108900168A CN 201810675009 A CN201810675009 A CN 201810675009A CN 108900168 A CN108900168 A CN 108900168A
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- ended amplifier
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- 239000004065 semiconductor Substances 0.000 claims description 6
- 230000010355 oscillation Effects 0.000 abstract description 3
- 238000010586 diagram Methods 0.000 description 4
- 230000008901 benefit Effects 0.000 description 3
- 238000005516 engineering process Methods 0.000 description 2
- 230000003321 amplification Effects 0.000 description 1
- 230000003247 decreasing effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 230000005611 electricity Effects 0.000 description 1
- 230000003993 interaction Effects 0.000 description 1
- 238000000034 method Methods 0.000 description 1
- 238000003199 nucleic acid amplification method Methods 0.000 description 1
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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
- H03F3/45408—Complementary long tailed pairs having parallel inputs and being supplied in parallel
- H03F3/45417—Folded cascode stages
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F2203/00—Indexing scheme relating to amplifiers with only discharge tubes or only semiconductor devices as amplifying elements covered by H03F3/00
- H03F2203/45—Indexing scheme relating to differential amplifiers
- H03F2203/45126—One or both transistors of the folded cascode stage of a folded cascode dif amp are composed of more than one transistor
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- Engineering & Computer Science (AREA)
- Power Engineering (AREA)
- Amplifiers (AREA)
Abstract
Turn single-ended amplifier the invention discloses the collapsible difference that output end can increase output voltage swing, including PMOS to pipe, NMOS to pipe group；The NMOS to pipe group include it is several to the NMOS being sequentially connected in series to pipe；The PMOS is grounded by constant-current source respectively again after connecting respectively with a pair of pins of NMOS to pipe group to a pair of pins of pipe, and the PMOS again connects another pair pin of pipe group by constant-current source and NMOS after being connected with each other to another pair pin of pipe.The amplitude of oscillation that difference turns output end output voltage in single-ended amplifier can be improved in the present invention.
Description
Technical field
The invention belongs to IC design technical fields, and in particular to output end can increase the folding of output voltage swing
Formula difference turns single-ended amplifier.
Background technique
Difference turn single end operational amplifier input signal be differential signal, output signal is single-ended signal, due to its
Noise, voltage swing, bandwidth frequency and unit gain etc. all show preferable superiority, and institute is so as to often as high property
The synonym of energy, and since a pair of of differential signal can be converted into an individual signal by it, it makes it possible to and is used in
In the circuit of certain special requirements.Traditional difference, which turns single-ended amplifier, common are single-stage and dual-stage amplifier, and single-stage is transported
Release be segmented into simple difference turn single-ended amplifier, telescopic cascode and collapsible cascode these three knot
Structure.
(1) turn single-ended amplifier as shown in Figure 1 for a simple simple-stage differential, Vdd indicates supply voltage, M1 and M2 structure
At input difference pair, M3 and M4 constitute load, and the gain of this amplifier is expressed as：
A_v≈g_m1(r_o1∥r_o3)
Wherein：Gm1 indicates input pipe M1 mutual conductance, and ro1 and ro3 indicate the output resistance of M1 and M3 pipe.
(2) in the design process of analog circuit, the operational amplifier of cascode structure is most widely used one
Kind, the maximization of voltage gain can be realized under the premise of keep frequency characteristic is outstanding.The purpose of this structure is selected, greatly
Majority is provided to raising gain as big as possible.The operational amplifier of cascode structure is broadly divided into telescopic and folds
Two kinds of formula, the gain of two kinds of structures is roughly the same.
The structure of telescopic cascode operational amplifier is telescopic total as shown in Fig. 2, in contrast to simple structure amplifier
Source-common gate structure increases two pairs of metal-oxide-semiconductors, so that amplifier gain is considerably improved.The mutual conductance of input pipe in the circuit
It is still gm1, output impedance is about increased to (g_m4r_o4) r_o2 ∥ (g_m6r_o6) r_o8, it is hereby achieved that the increasing of the circuit
Benefit is：
A_v≈g_m1[(g_m4r_o4)r_o2∥(g_m6r_o6)r_o8]
It can be seen that gain of the cascode structure than simple structure improves many.
The structure of collapsible cascode operational amplifier as shown in figure 3, amplification principle with it is telescopic almost the same, it is defeated
Impedance out is also about (g_m4r_o4) r_o2 ∥ (g_m6r_o6) r_o8, the gain of circuit also with it is telescopic consistent：
A_v≈g_m1[(g_m4r_o4)r_o2∥(g_m6r_o6)r_o8]
Accordion structure is the difference is that having become PMOS tube from NMOS tube to pipe for Differential Input and having carried out one
Secondary folding as a result it should be clear that the power dissipation ratio of this structure is telescopic to increase one times, but sacrifices one times
Power consumption brings advantage equally apparent, that is, the increase of input common-mode range and the increase of output voltage swing.
For the input common-mode range and output voltage swing of amplifier, we can beg for three kinds of structures in detail respectively
By as follows：
For simple amplifier, as shown in Figure 1, its input common-mode range is：Vdsat+VTH<VCM<VDD, output electricity
Pressure the amplitude of oscillation be：2Vdsat<VOUT<VDD-Vdsat, wherein Vdsat is the minimum overdrive voltage of metal-oxide-semiconductor, and VTH is metal-oxide-semiconductor
Threshold voltage.
For Telescopic cascode amplifier, as shown in Fig. 2, its input common-mode range is：Vdsat+VTH<VCM<
VDD-VTH-Vdsat, output voltage swing are：3Vdsat<VOUT<VDD-2Vdsat.
For folded cascode Op Amp, as shown in figure 3, its input common-mode range is：0V<VCM<VDD-VTH-
2Vdsat, output voltage swing are：2Vdsat<VOUT<VDD-2Vdsat.
Summary of the invention
The present invention is directed to solve at least some of the technical problems in related technologies.For this purpose, of the invention
Main purpose, which is to provide output end and can increase the collapsible difference of output voltage swing, turns single-ended amplifier, it is intended to solve difference
Turn the lesser problem of output end output voltage swing in single-ended amplifier.
The purpose of the present invention is what is be achieved through the following technical solutions：
The collapsible difference that output end can increase output voltage swing turns single-ended amplifier,
Including metal-oxide-semiconductor M1, M2, M5, M6, M7, M8；Triode M3 and M4；And constant-current source；
The drain electrode of M1 and M2 is connect by constant-current source with VDD again after being connected, after the source electrode of M1 and M2 pass through constant-current source respectively
The grid of ground connection, M1 and M2 are connect with Vin+ and Vin- respectively；
The source electrode of M3 and the source electrode of M1 connect, and the source electrode of M4 and the source electrode of M2 connect；M3 is connected with the grid of M4, M3 and M4
Drain electrode connect respectively with the drain electrode of M7 and M8,
M7 is connected with the grid of M8, and the drain electrode of the grid and M7 of M7 connects, and the source electrode of M7 and M8 are connected to be connect with VDD again；
The drain electrode of M4 is connect with Vout.
Further, common mode input range is 0V<VCM<VDD-VTH-2Vdsat。
Further, output voltage swing 2Vdsat<VOUT<VDD-Vdsat.
Compared with prior art, the present invention has at least the following advantages：
The quantity of pipe can be obtained between output voltage swing and the gain of amplifier by increasing or decreasing series connection NMOS
Adjusting can control NMOS and bigger output voltage obtained to the quantity of pipe so that amplifier more meets actual demand
The amplitude of oscillation.
Detailed description of the invention
In order to more clearly explain the embodiment of the invention or the technical proposal in the existing technology, to embodiment or will show below
There is attached drawing needed in technical description to be briefly described, it should be apparent that, the accompanying drawings in the following description is only this
Some embodiments of invention for those of ordinary skill in the art without creative efforts, can be with
The structure shown according to these attached drawings obtains other attached drawings.
Fig. 1 is the electrical block diagram of simple Differential OPAMP structure；
Fig. 2 is the electrical block diagram of telescopic cascode operational amplifier；
Fig. 3 is the electrical block diagram of collapsible cascode operational amplifier；
Fig. 4 turns the circuit structure of single-ended amplifier for the collapsible difference that output end of the present invention can increase output voltage swing
Schematic diagram；
Specific embodiment
Following will be combined with the drawings in the embodiments of the present invention, and technical solution in the embodiment of the present invention carries out clear, complete
Site preparation description, it is clear that described embodiment is only a part of the embodiments of the present invention, instead of all the embodiments.
Based on the embodiments of the present invention, those of ordinary skill in the art are obtained without creative efforts
The every other embodiment obtained, shall fall within the protection scope of the present invention.
It is to be appreciated that the directional instruction (such as up, down, left, right, before and after ...) of institute is only used in the embodiment of the present invention
In explaining in relative positional relationship, the motion conditions etc. under a certain particular pose (as shown in the picture) between each component, if should
When particular pose changes, then directionality instruction also correspondingly changes correspondingly.
The description for being such as related to " first ", " second " in the present invention is used for description purposes only, and should not be understood as indicating
Or it implies its relative importance or implicitly indicates the quantity of indicated technical characteristic." first ", " second " are defined as a result,
Feature can explicitly or implicitly include at least one of the features.
In the description of the present invention, the meaning of " plurality " is at least two, such as two, three etc., unless otherwise clear
It is specific to limit.
In the present invention unless specifically defined or limited otherwise, term " connection ", " fixation " etc. shall be understood in a broad sense,
For example, " fixation " may be a fixed connection, it may be a detachable connection, or integral；It can be mechanical connection, be also possible to
Electrical connection；It can be directly connected, the connection inside two elements or two can also be can be indirectly connected through an intermediary
The interaction relationship of a element, unless otherwise restricted clearly.It for the ordinary skill in the art, can basis
Concrete condition understands the concrete meaning of above-mentioned term in the present invention.
It in addition, the technical solution between each embodiment of the present invention can be combined with each other, but must be general with this field
Based on logical technical staff can be realized, it will be understood that when the combination of technical solution appearance is conflicting or cannot achieve this
The combination of technical solution is not present, also not the present invention claims protection scope within.
Embodiment 1
As shown in figure 4, the collapsible difference that output end can increase output voltage swing turns single-ended amplifier,
Including metal-oxide-semiconductor M1, M2, M5, M6, M7, M8；Triode M3 and M4；And constant-current source；
The drain electrode of M1 and M2 is connect by constant-current source with VDD again after being connected, after the source electrode of M1 and M2 pass through constant-current source respectively
The grid of ground connection, M1 and M2 are connect with Vin+ and Vin- respectively；
The source electrode of M3 and the source electrode of M1 connect, and the source electrode of M4 and the source electrode of M2 connect；M3 is connected with the grid of M4, M3 and M4
Drain electrode connect respectively with the drain electrode of M7 and M8,
M7 is connected with the grid of M8, and the drain electrode of the grid and M7 of M7 connects, and the source electrode of M7 and M8 are connected to be connect with VDD again；
The drain electrode of M4 is connect with Vout.
The present invention reduces the load of primary current mirror in traditional folded cascode Op Amp, so that output voltage is put
Width is increased an overdrive voltage Vdsat, and common-mode input voltage range is basically unchanged.Common mode input of the invention
Range and output voltage swing：0V<VCM<VDD-VTH-2Vdsat, 2Vdsat<VOUT<VDD-Vdsat, it can be seen that this hair
Bright common mode input range is identical as traditional accordion structure, is better than telescoping structure and simple amplifier structure；And it exports
Voltage swing is then better than traditional accordion structure and telescoping structure, identical as simple amplifier structure.
More than, it is merely preferred embodiments of the present invention, but the protection scope invented is not limited thereto, it is any ripe
Know those skilled in the art in the technical scope disclosed by the present invention, any changes or substitutions that can be easily thought of, should all contain
Lid is within protection scope of the present invention.Therefore, the scope of protection of the invention shall be subject to the scope of protection specified in the patent claim.
Claims (3)
1. the collapsible difference that output end can increase output voltage swing turns single-ended amplifier, which is characterized in that
Including metal-oxide-semiconductor M1, M2, M5, M6, M7, M8；Triode M3 and M4；And constant-current source；
The drain electrode of M1 and M2 is connect by constant-current source with VDD again after being connected, and the source electrode of M1 and M2 are grounded after passing through constant-current source respectively,
The grid of M1 and M2 is connect with Vin+ and Vin- respectively；
The source electrode of M3 and the source electrode of M1 connect, and the source electrode of M4 and the source electrode of M2 connect；M3 is connected with the grid of M4, the leakage of M3 and M4
Pole is connect with the drain electrode of M7 and M8 respectively,
M7 is connected with the grid of M8, and the drain electrode of the grid and M7 of M7 connects, and the source electrode of M7 and M8 are connected to be connect with VDD again；
The drain electrode of M4 is connect with Vout.
2. the collapsible difference that output end according to claim 1 can increase output voltage swing turns single-ended amplifier,
It is characterized in that, common mode input range is 0V<VCM<VDD-VTH-2Vdsat。
3. the collapsible difference that output end according to claim 1 can increase output voltage swing turns single-ended amplifier,
It is characterized in that, output voltage swing 2Vdsat<VOUT<VDD-Vdsat.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN201810675009.0A CN108900168A (en) | 2018-06-27 | 2018-06-27 | The collapsible difference that output end can increase output voltage swing turns single-ended amplifier |
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| CN201810675009.0A CN108900168A (en) | 2018-06-27 | 2018-06-27 | The collapsible difference that output end can increase output voltage swing turns single-ended amplifier |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114265461A (en) * | 2021-12-15 | 2022-04-01 | 深圳飞骧科技股份有限公司 | Reference voltage source |
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Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN114265461A (en) * | 2021-12-15 | 2022-04-01 | 深圳飞骧科技股份有限公司 | Reference voltage source |
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