CN105099380A - Fully-differential amplifier - Google Patents
Fully-differential amplifier Download PDFInfo
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- CN105099380A CN105099380A CN201410192979.7A CN201410192979A CN105099380A CN 105099380 A CN105099380 A CN 105099380A CN 201410192979 A CN201410192979 A CN 201410192979A CN 105099380 A CN105099380 A CN 105099380A
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- differential amplifier
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Abstract
The invention discloses a fully-differential amplifier. The fully-differential amplifier comprises a differential mode operational amplifier; the differential mode operational amplifier comprises a first transistor, a second transistor, a first output transistor and a current branch, wherein the input end of the first output transistor is connected with the first transistor and the second transistor respectively; the current output end of the current branch is connected with the input end of the first output transistor; and the current branch is used for inputting current into the input end of the first output transistor. By means of the invention, the purpose of increasing the stability of the fully-differential amplifier is achieved.
Description
Technical field
The present invention relates to amplifier region, in particular to a kind of fully-differential amplifier.
Background technology
Fully-differential amplifier generally includes differential mode operational amplifier and common mode operational amplifier.In fully-differential amplifier, if output common mode value is higher, can there is " deadlock " state in the circuit in fully-differential amplifier, cause fully-differential amplifier disabler.Usually, under the effect of common mode operational amplifier, if the feedback signal CMFB of common-mode feedback reduces, two transistors that the first order of the two stage amplifer of fully-differential amplifier can be made to export turn off.Because the common mode value of amplifier output is higher, the voltage of fully-differential amplifier input also can be higher, if the voltage of fully-differential amplifier input is higher than certain threshold value, then the input of differential mode operational amplifier will turn off pipe.Now, the first order of the two stage amplifer of fully-differential amplifier exports and will be in floating high-impedance state, and voltage is indefinite.If the input voltage of two transistors that the first order exports is lower than certain threshold value, then two transistors of the second level input of the two stage amplifer of fully-differential amplifier will be turned off.Due to the bias current sustainable existence of tail current, the output voltage of fully-differential amplifier will maintain near supply voltage, the disabler of circuit in fully-differential amplifier, and cannot recover.
Can find out according to foregoing description, the circuit in prior art in fully-differential amplifier easily produces " deadlock " state, causes the disabler of circuit in fully-differential amplifier, makes fully-differential amplifier fluctuation of service.
For in prior art because the disabler of circuit in fully-differential amplifier causes the problem of fully-differential amplifier fluctuation of service, at present effective solution is not yet proposed.
Summary of the invention
Main purpose of the present invention is to provide a kind of fully-differential amplifier, to solve in prior art because the disabler of circuit in fully-differential amplifier causes the problem of fully-differential amplifier fluctuation of service.
To achieve these goals, according to an aspect of the present invention, a kind of fully-differential amplifier is provided.Fully-differential amplifier according to the present invention comprises differential mode operational amplifier, and differential mode operational amplifier comprises: the first transistor; Transistor seconds; First output transistor, the input of the first output transistor is connected with transistor seconds respectively with the first transistor; And current branch, the current output terminal of current branch is connected with the input of the first output transistor, and current branch is used for the input input current to the first output transistor.
Further, the first transistor comprises the first PMOS, and transistor seconds comprises the second PMOS, and wherein, the first output transistor comprises: the first NMOS tube, and the drain electrode of the first NMOS tube is connected with the source electrode of the first PMOS; And second NMOS tube, the drain electrode of the second NMOS tube is connected with the source electrode of the second PMOS, and wherein, the grid of the first NMOS tube is connected with the grid of the second NMOS tube.
Further, current branch comprises: the first electron current branch road, and the output of the first electron current branch road is connected with the drain electrode of the first NMOS tube, and the first electron current branch road is used for the drain electrode input current to the first NMOS tube; And the second electron current branch road, the output of the second electron current branch road is connected with the drain electrode of the second NMOS tube, and the second electron current branch road is used for the drain electrode input current to the second NMOS tube.
Further, the first electron current branch road is identical with the components and parts that the second electron current branch road comprises.
Further, fully-differential amplifier is the fully-differential amplifier formed by integrated circuit.
Further, fully-differential amplifier comprises power input, and power input is used for providing electric energy to fully-differential amplifier.
Further, the input of current branch is connected with power input, and current branch is used for by the input input current of power input to the first output transistor.
Further, fully-differential amplifier also comprises: common-mode feedback branch road; And common mode operational amplifier, common mode operational amplifier is connected by common-mode feedback branch road with differential mode operational amplifier.
Further, common mode operational amplifier comprises: sub-amplifier, and the output of sub-amplifier is connected by common-mode feedback branch road with the grid of the first NMOS tube.
Further, differential mode operational amplifier also comprises the second output transistor, and the second output transistor comprises: the 3rd NMOS tube, and the grid of the 3rd NMOS tube is connected with the drain electrode of the first NMOS tube; And the 4th NMOS tube, the grid of the 4th NMOS tube is connected with the drain electrode of the second NMOS tube.
Pass through the present invention, owing to adding current branch in fully-differential amplifier, when making fully-differential amplifier that " deadlock " state occur, can by the input input current of current branch to the first output transistor, thus make the first output transistor conducting, fully-differential amplifier recovers normal work, solves because in fully-differential amplifier, the disabler of circuit causes the problem of fully-differential amplifier fluctuation of service, reaches the effect of the stability improving fully-differential amplifier.
Accompanying drawing explanation
The accompanying drawing forming a application's part is used to provide a further understanding of the present invention, and schematic description and description of the present invention, for explaining the present invention, does not form inappropriate limitation of the present invention.In the accompanying drawings:
Fig. 1 is the circuit diagram of the fully-differential amplifier according to the embodiment of the present invention; And
Fig. 2 is the schematic diagram of the fully-differential amplifier external circuit according to the embodiment of the present invention.
Embodiment
It should be noted that, when not conflicting, the embodiment in the application and the feature in embodiment can combine mutually.Below with reference to the accompanying drawings and describe the present invention in detail in conjunction with the embodiments.
The present invention program is understood better in order to make those skilled in the art person, below in conjunction with the accompanying drawing in the embodiment of the present invention, technical scheme in the embodiment of the present invention is clearly and completely described, obviously, described embodiment is only the embodiment of a part of the present invention, instead of whole embodiments.Based on the embodiment in the present invention, those of ordinary skill in the art, not making the every other embodiment obtained under creative work prerequisite, should belong to the scope of protection of the invention.
It should be noted that, term " first ", " second " etc. in specification of the present invention and claims and above-mentioned accompanying drawing are for distinguishing similar object, and need not be used for describing specific order or precedence.Should be appreciated that the data used like this can be exchanged, in the appropriate case so that embodiments of the invention described herein.In addition, term " comprises " and " having " and their any distortion, intention is to cover not exclusive comprising, such as, contain those steps or unit that the process of series of steps or unit, method, system, product or equipment is not necessarily limited to clearly list, but can comprise clearly do not list or for intrinsic other step of these processes, method, product or equipment or unit.
Embodiments provide a kind of fully-differential amplifier.
Fig. 1 is the circuit diagram of the fully-differential amplifier according to the embodiment of the present invention.As shown in Figure 1, this fully-differential amplifier, comprises differential mode operational amplifier 11, and wherein, differential mode operational amplifier 11 comprises the first transistor 111, transistor seconds 112, first output transistor and current branch.The first transistor 111 and transistor seconds 112 can be PMOS also can be other transistor.
The input of the first output transistor is connected with transistor seconds 112 respectively with the first transistor 111.Wherein, the first output transistor can be the first order amplifier transistor of fully-differential amplifier, the first output transistor can be comprise two NMOS tube output to pipe, be connected respectively with transistor seconds 112 with the first transistor 111 respectively.
The current output terminal of current branch is connected with the input of the first output transistor, and current branch is used for the input input current to the first output transistor.Current branch can be the current branch comprising DC source, by the input input current of current branch to the first output transistor, that is, is charged by the input of current branch to the first output transistor.As shown in Figure 1, when the first output transistor comprises two NMOS tube, current branch can comprise two strip current branch, and two NMOS tube respectively at the first output transistor are connected to M point and N point.
It should be noted that, can be the electric current of the input power of fully-differential amplifier to the electric current that the input of the first output transistor inputs by current branch, also can be the electric current (not shown in FIG.) that other power supplys provide, the current value of its electric current can be the current value of the leakage current being less than M point and N point, does not have improper restriction here to the present invention.
According to the embodiment of the present invention, owing to adding current branch in fully-differential amplifier, when making fully-differential amplifier that " deadlock " state occur, can by the input input current of current branch to the first output transistor, thus make the first output transistor conducting, fully-differential amplifier recovers normal work, solves because in fully-differential amplifier, the disabler of circuit causes the problem of fully-differential amplifier fluctuation of service, reaches the effect of the stability improving fully-differential amplifier.
Preferably, the first transistor comprises the first PMOS, and transistor seconds comprises the second PMOS, and namely the fully-differential amplifier of the embodiment of the present invention can be the fully-differential amplifier using PMOS as input to pipe.As shown in Figure 1, the grid of the first PMOS can as the input inp of fully-differential amplifier, and the grid of the second PMOS can as the input inn of fully-differential amplifier.The drain electrode of the first PMOS is connected with the drain electrode of the second PMOS, and is connected to the source electrode of the 3rd PMOS 115.Wherein, the drain electrode of the 3rd PMOS 115 is connected with power supply.
As shown in Figure 1, the first output transistor comprises the first NMOS tube 113 and the second NMOS tube .114.The drain electrode of the first NMOS tube 113 is connected with the source electrode of the first PMOS.The drain electrode of the second NMOS tube 114 is connected with the source electrode of the second PMOS.Wherein, the grid of the first NMOS tube 113 is connected with the grid of the second NMOS tube 114.First NMOS tube 113 and the second NMOS tube 114 can export pipe as the first order of fully-differential amplifier.
According to the embodiment of the present invention, by adopting the first PMOS and the second PMOS, the stability to the fully-differential amplifier of pipe using PMOS as input can be improved.
Preferably, current branch comprises the first electron current branch road 116 and the second electron current branch road 117.
As shown in Figure 1, the output of the first electron current branch road 116 is connected with the drain electrode of the first NMOS tube 113 (as M point in Fig. 1), and the first electron current branch road 116 is for the drain electrode input current to the first NMOS tube 113.The output of the second electron current branch road 117 is connected with the drain electrode of the second NMOS tube 114 (as N point in Fig. 1), and the second electron current branch road 117 is for the drain electrode input current to the second NMOS tube 114.
When there is " deadlock " state in fully-differential amplifier, can be charged respectively to M point and N point by the first electron current branch road 116 and the second electron current branch road 117, the voltage of M point and N point is made to exceed certain threshold value, thus make the first NMOS tube 113 and all conductings of the second NMOS tube 114, and then make fully-differential amplifier recover normal operation, improve the stability of fully-differential amplifier.
Preferably, the first electron current branch road 116 is identical with the components and parts that the second electron current branch road 117 comprises.Owing to needing to keep the components and parts of both sides identical, therefore identical with the components and parts comprised in the second electron current branch road 117 at the first electron current branch road 116 in fully-differential amplifier.
It should be noted that, in circuit branch (comprising the first electron current branch road 116 and the second electron current branch road 117), the components and parts such as resistance, transistor can be included, also can be do not comprise any components and parts, not have improper restriction to the present invention here.
Preferably, fully-differential amplifier is the fully-differential amplifier formed by integrated circuit.
Preferably, fully-differential amplifier comprises power input, and this power input is used for providing electric energy to fully-differential amplifier.As shown in Figure 1, the power input being fully-differential amplifier that the drain electrode of the 3rd PMOS 115 connects, because fully-differential amplifier is the fully-differential amplifier formed by integrated circuit, therefore in the fully-differential amplifier course of work, need to provide electric energy to fully-differential amplifier.
Preferably, the input of current branch is connected with power input, and current branch is used for by the input input current of power input to the first output transistor.Particularly, as shown in Figure 1, the first electron current branch road 116 is connected respectively at power input with the input of the second electron current branch road 117.
Preferably, fully-differential amplifier also comprises common-mode feedback branch road CMFB and common mode operational amplifier 12.Common mode operational amplifier 12 is connected by common-mode feedback branch road CMFB with differential mode operational amplifier 11.Whole fully-differential amplifier is formed by common-mode feedback branch road CMFB, common mode operational amplifier 12 and differential mode operational amplifier 11.
Preferably, common mode operational amplifier comprises sub-amplifier 121, and the output of this sub-amplifier 121 is connected by common-mode feedback branch road CMFB with the grid of the first NMOS tube 113.As shown in Figure 1, because the grid of the first NMOS tube 113 is connected with the grid of the second NMOS tube 114, therefore, the output of sub-amplifier 121 is also connected by common-mode feedback branch road CMFB with the grid of the second NMOS tube 114.Wherein, sub-amplifier 121 comprises negative input end and positive input terminal VCMO, and wherein, positive input terminal VCMO can access common mode ideal voltage value, such as the half of fully-differential amplifier input supply voltage value.
Preferably, differential mode operational amplifier also comprises the second output transistor, and this second output transistor comprises the 3rd NMOS tube and the 4th NMOS tube.As shown in Figure 1, the grid of the 3rd NMOS tube is connected with the drain electrode of the first NMOS tube.The grid of the 4th NMOS tube is connected with the drain electrode of the second NMOS tube.Second output transistor can be that the second level of fully-differential amplifier exports pipe, wherein, the drain electrode of the 3rd NMOS tube can as the first output outp of fully-differential amplifier, and the drain electrode of the 4th NMOS tube can as the second output outn of fully-differential amplifier.As shown in Figure 1, the first output outp and the second output outn of fully-differential amplifier is also included in common mode operational amplifier 12.
Fig. 2 is the schematic diagram of the fully-differential amplifier external circuit according to the embodiment of the present invention.As shown in Figure 2, fully-differential amplifier 1 comprises first input end C and the second input C1, and the first output B and the second output B1, and wherein R1, R2 are resistance.Wherein, the first input end C shown in Fig. 2 can with the inp shown in Fig. 1, the second input C1 can be connected with the inn shown in Fig. 1, the first output B can with the outp shown in Fig. 1, the second output B1 can be connected with the outn shown in Fig. 1.
Below in conjunction with Fig. 1 and Fig. 2, the embodiment of the present invention is described in detail.
Under the effect of common mode operational amplifier 12, if the feedback signal of common-mode feedback branch road CMFB reduces, two transistors (i.e. the first NMOS tube 113 and the second NMOS tube 114 in Fig. 1) that the first order of the two stage amplifer of fully-differential amplifier 1 can be made to export turn off.Because the common mode value of amplifier output (comprising the first output B and the second output B1) is higher, the voltage of fully-differential amplifier input (comprising first input end C and the second input C1) also can be higher, if the voltage of fully-differential amplifier input is higher than certain threshold voltage, then the input of differential mode operational amplifier will turn off pipe (i.e. the first PMOS 111 and the second PMOS 112).Now, the first order of the two stage amplifer of fully-differential amplifier exports and will be in floating high-impedance state, and voltage is indefinite.If the input voltage of two transistors (i.e. the first NMOS tube 113 and the second NMOS tube 114 in Fig. 1) that the first order exports is lower than certain threshold value, then two transistors (i.e. the 3rd NMOS tube and the 4th NMOS tube) of the second level input of the two stage amplifer of fully-differential amplifier will be turned off.Due to the bias current sustainable existence of tail current, the output voltage of fully-differential amplifier will maintain near supply voltage, the disabler of circuit in fully-differential amplifier 1, and cannot recover.
In the embodiment of the present invention, exporting M, N point in the first order of fully-differential amplifier 1 increases the bias current fixed on a road respectively by current branch, and current value can very little (being greater than the leakage current of M, N point).
When " deadlock " state of generation, according to analysis before, it is even zero that the feedback signal of common-mode feedback reduces, and the input of differential mode operational amplifier 11 turns off pipe.Now., due to adding of fixing bias current, M and N point is made to be no longer floating high resistant point, current branch can be charged to M and N, and when the voltage of M and N point exceedes certain threshold value, two NMOS tube of the second level input of fully-differential amplifier 1 are opened, common mode feedback circuit CMFB works, can by the regulation of electrical circuit of fully-differential amplifier 1 to normal working point, thus make fully-differential amplifier 1 recover normal condition, improve the stability of fully-differential amplifier 1.
The foregoing is only the preferred embodiments of the present invention, be not limited to the present invention, for a person skilled in the art, the present invention can have various modifications and variations.Within the spirit and principles in the present invention all, any amendment done, equivalent replacement, improvement etc., all should be included within protection scope of the present invention.
Claims (10)
1. a fully-differential amplifier, is characterized in that, comprises differential mode operational amplifier, and described differential mode operational amplifier comprises:
The first transistor;
Transistor seconds;
First output transistor, the input of described first output transistor is connected with described transistor seconds respectively with described the first transistor; And
Current branch, the current output terminal of described current branch is connected with the input of described first output transistor, and described current branch is used for the input input current to described first output transistor.
2. fully-differential amplifier according to claim 1, is characterized in that, described the first transistor comprises the first PMOS, and described transistor seconds comprises the second PMOS, and wherein, described first output transistor comprises:
First NMOS tube, the drain electrode of described first NMOS tube is connected with the source electrode of described first PMOS; And
Second NMOS tube, the drain electrode of described second NMOS tube is connected with the source electrode of described second PMOS,
Wherein, the grid of described first NMOS tube is connected with the grid of described second NMOS tube.
3. fully-differential amplifier according to claim 2, is characterized in that, described current branch comprises:
First electron current branch road, the output of described first electron current branch road is connected with the drain electrode of described first NMOS tube, and described first electron current branch road is used for the drain electrode input current to described first NMOS tube; And
Second electron current branch road, the output of described second electron current branch road is connected with the drain electrode of described second NMOS tube, and described second electron current branch road is used for the drain electrode input current to described second NMOS tube.
4. fully-differential amplifier according to claim 3, is characterized in that, described first electron current branch road is identical with the components and parts that described second electron current branch road comprises.
5. fully-differential amplifier according to claim 1, is characterized in that, described fully-differential amplifier is the fully-differential amplifier formed by integrated circuit.
6. fully-differential amplifier according to claim 1, is characterized in that, described fully-differential amplifier comprises power input, and described power input is used for providing electric energy to described fully-differential amplifier.
7. fully-differential amplifier according to claim 6, it is characterized in that, the input of described current branch is connected with described power input, and described current branch is used for by the input input current of described power input to described first output transistor.
8. fully-differential amplifier according to claim 2, is characterized in that, described fully-differential amplifier also comprises:
Common-mode feedback branch road; And
Common mode operational amplifier, described common mode operational amplifier is connected by described common-mode feedback branch road with described differential mode operational amplifier.
9. fully-differential amplifier according to claim 8, is characterized in that, described common mode operational amplifier comprises:
Sub-amplifier, the output of described sub-amplifier is connected by described common-mode feedback branch road with the grid of described first NMOS tube.
10. fully-differential amplifier according to claim 2, is characterized in that, described differential mode operational amplifier also comprises the second output transistor, and described second output transistor comprises:
3rd NMOS tube, the grid of described 3rd NMOS tube is connected with the drain electrode of described first NMOS tube; And
4th NMOS tube, the grid of described 4th NMOS tube is connected with the drain electrode of described second NMOS tube.
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| CN201410192979.7A CN105099380A (en) | 2014-05-08 | 2014-05-08 | Fully-differential amplifier |
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| CN201410192979.7A CN105099380A (en) | 2014-05-08 | 2014-05-08 | Fully-differential amplifier |
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| CN105099380A true CN105099380A (en) | 2015-11-25 |
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| CN106656079A (en) * | 2016-09-30 | 2017-05-10 | 天津大学 | Robust fully-differential amplifier device |
| TWI623194B (en) * | 2016-11-29 | 2018-05-01 | 瑞昱半導體股份有限公司 | Operational amplifier and differential amplifying circuit thereof |
| CN108155882A (en) * | 2016-12-06 | 2018-06-12 | 瑞昱半导体股份有限公司 | Operational amplifier and its differential amplifier circuit |
| CN108347228A (en) * | 2017-01-24 | 2018-07-31 | 中芯国际集成电路制造(上海)有限公司 | A kind of difference amplifier |
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| CN108347228A (en) * | 2017-01-24 | 2018-07-31 | 中芯国际集成电路制造(上海)有限公司 | A kind of difference amplifier |
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