CN113809998A - Folding type cascode operational amplifier and electronic equipment - Google Patents

Folding type cascode operational amplifier and electronic equipment Download PDF

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Publication number
CN113809998A
CN113809998A CN202111368380.0A CN202111368380A CN113809998A CN 113809998 A CN113809998 A CN 113809998A CN 202111368380 A CN202111368380 A CN 202111368380A CN 113809998 A CN113809998 A CN 113809998A
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mos transistor
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current source
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苏杰
朱勇
徐祎喆
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Shenzhen Bairui Internet Technology Co ltd
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    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F3/00—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements
    • H03F3/04—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only
    • H03F3/16—Amplifiers with only discharge tubes or only semiconductor devices as amplifying elements with semiconductor devices only with field-effect devices
    • 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
    • H03F1/3205—Modifications of amplifiers to reduce non-linear distortion in field-effect transistor amplifiers
    • 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
    • H03F1/38—Positive-feedback circuit arrangements without negative feedback
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/72—Indexing scheme relating to amplifiers the amplifier stage being a common gate configuration MOSFET
    • H—ELECTRICITY
    • H03—ELECTRONIC CIRCUITRY
    • H03F—AMPLIFIERS
    • H03F2200/00—Indexing scheme relating to amplifiers
    • H03F2200/75—Indexing scheme relating to amplifiers the amplifier stage being a common source configuration MOSFET

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Abstract

The invention discloses a folding type cascode operational amplifier and electronic equipment, and relates to the technical field of amplifiers, mainly comprising a positive feedback module, a seventh MOS tube M9, a fifth MOS tube M7, an eighth MOS tube M10 and a sixth MOS tube M8, wherein a node n4 between a source stage of the fifth MOS tube M7 and a drain electrode of the seventh MOS tube M9 is used as a positive input end and a negative output end of the positive feedback module, and a node n5 between the source stage of the sixth MOS tube M8 and the drain electrode of the eighth MOS tube M10 is used as a negative input end and a positive output end of the positive feedback module. The invention keeps the frequency response of the circuit unchanged on the premise of enhancing the direct current gain, the voltage swing of the input end of the positive feedback module is far smaller than the conventional voltage swing, so that the linearity is higher, the stability is higher, the input common-mode voltage is higher, and no extra capacitor is added to an output node, so that the pole and the phase margin can not be reduced.

Description

Folding type cascode operational amplifier and electronic equipment
Technical Field
The application relates to the technical field of amplifiers, in particular to a folding cascode operational amplifier and an electronic device.
Background
The first folded cascode operational amplifier was introduced over 30 years ago and has found widespread use in consumer electronics, and designers have been trying to improve its basic characteristics, such as dc gain, Common Mode Rejection Ratio (CMRR) and Slew Rate (SR), over the three decades. The prior art for improving the dc gain includes two methods, one is to improve the common mode rejection ratio and the dc gain by using a fully differential structure, and the other is to enhance the dc gain by using a positive feedback loop. However, the main disadvantage of adding a positive feedback loop to the main structure of the operational amplifier is that the threshold voltage changes, another disadvantage of adding a positive feedback loop to the main structure of the operational amplifier is that the high voltage swing at the input of the positive feedback module causes nonlinearity, and the added positive feedback module reduces the first pole, which reduces the bandwidth, and the second pole also reduces due to the miller effect, and the amount of phase margin decreases.
Disclosure of Invention
The invention provides a folding cascade operational amplifier, which keeps the frequency response of a circuit unchanged on the premise of enhancing direct current gain, the voltage swing of the input end of a positive feedback module is far smaller than the conventional voltage swing, so that the linearity and the stability of the operational amplifier are higher, the input common-mode voltage of the positive feedback module in the operational amplifier framework is higher, and no extra capacitor is added to an output node, so that the pole and the phase margin are not reduced.
In order to solve the above problems, the present invention adopts a technical solution that: the folded cascode operational amplifier comprises a positive feedback module, a first current source M11, a second current source M3, a third current source M4, a first MOS tube M1, a second MOS tube M2, a third MOS tube M5, a fourth MOS tube M6, a seventh MOS tube M9, a fifth MOS tube M7, an eighth MOS tube M10 and a sixth MOS tube M8;
the power supply VDD is connected to the source of the first MOS transistor M1 and the source of the second MOS transistor M2 through the first current source M11, and the gate of the first MOS transistor M1 is used as the positive input terminal V of the amplifieri+The drain of the first MOS transistor M1 is connected to the source of the third MOS transistor M5, and is connected to the second current source M3The grid electrode of the third MOS tube M5 is connected with a bias voltage source VB2The drain of the third MOS transistor M5 is connected to the drain of the fifth MOS transistor M7, and the drain of the third MOS transistor M5 serves as the positive output terminal V of the amplifierO+The grid electrode of the fifth MOS tube M7 is connected with a bias voltage source VB3The source of the fifth MOS transistor M7 is connected to the drain of the seventh MOS transistor M9, a node n4 between the source of the fifth MOS transistor M7 and the drain of the seventh MOS transistor M9 serves as a positive input terminal and a negative output terminal of the positive feedback module, and the gate of the seventh MOS transistor M9 is connected to a bias voltage source VB4The source of the seventh MOS transistor M9 is connected to the first current source M11;
the grid of the second MOS transistor M2 is used as the negative input end V of the amplifieri-The drain of the second MOS transistor M2 is connected to the source of the fourth MOS transistor M6 and grounded via the third current source M4, and the gate of the fourth MOS transistor M6 is connected to the bias voltage source VB2The drain of the fourth MOS transistor M6 is connected to the drain of the sixth MOS transistor M8, and the drain of the fourth MOS transistor M6 serves as the negative output terminal V of the amplifierO-The grid electrode of the sixth MOS tube M8 is connected with a bias voltage source VB3The source of the sixth MOS transistor M8 is connected to the drain of the eighth MOS transistor M10, a node n5 between the source of the sixth MOS transistor M8 and the drain of the eighth MOS transistor M10 serves as a negative input end and a positive output end of the positive feedback module, and the gate of the eighth MOS transistor M10 is connected to a bias voltage source VB4The source of the eighth MOS transistor M10 is connected to the first current source M11.
In another aspect of the present invention, an electronic device is provided, which includes the folded cascode operational amplifier.
The technical scheme of the invention can achieve the following beneficial effects: the invention provides a folding cascade operational amplifier and electronic equipment, which keep the frequency response of a circuit unchanged on the premise of enhancing direct current gain, ensure that the voltage swing of the input end of a positive feedback module is far smaller than the conventional voltage swing, further ensure that the linearity and the stability of the operational amplifier are higher, ensure that the input common-mode voltage of the positive feedback module in the operational amplifier framework is higher, and simultaneously, no extra capacitor is added to an output node, so the pole and the phase margin amount cannot be reduced.
Drawings
In order to more clearly illustrate the embodiments of the present application or the technical solutions in the prior art, the drawings needed to be used in the description of the embodiments or the prior art will be briefly introduced below, and it is obvious that the drawings in the following description are some embodiments of the present application, and for those skilled in the art, other drawings can be obtained according to these drawings without inventive exercise.
FIG. 1 is a schematic diagram of one embodiment of a prior art folded cascode operational amplifier;
FIG. 2 is a schematic diagram of one embodiment of a folded cascode operational amplifier according to the present invention;
FIG. 3 is a schematic diagram of an embodiment of a folded cascode operational amplifier of the present invention;
the components in figure 1 are labeled as follows: m1 '-ninth MOS tube, M2' -tenth MOS tube, M3 '-eleventh MOS tube, M4' -twelfth MOS tube, M5 '-thirteenth MOS tube, M6' -fourteenth MOS tube, M7 '-fifteenth MOS tube, M8' -sixteenth MOS tube, M9 '-seventeenth MOS tube, M10' -eighteenth MOS tube, M11 '-nineteenth MOS tube, M12' -twentieth MOS tube, M13 '-twenty-first MOS tube and M14' -twenty-second MOS tube.
The components in figures 2, 3 are numbered as follows: m1-first MOS tube, M2-second MOS tube, M3-second current source, M4-third current source, M5-third MOS tube, M6-fourth MOS tube, M7-fifth MOS tube, M8-sixth MOS tube, M9-seventh MOS tube, M10-eighth MOS tube, M11-first current source, Mp 1-first positive feedback MOS tube, Mp 2-second positive feedback MOS tube, Mp 3-positive feedback current source, C2-second positive feedback current source1-a first load capacitance, C2-a second load capacitance.
Detailed Description
The following detailed description of the preferred embodiments of the present invention, taken in conjunction with the accompanying drawings, will make the advantages and features of the invention easier to understand by those skilled in the art, and thus will clearly and clearly define the scope of the invention.
It is noted that, herein, relational terms such as first and second, and the like may be used solely to distinguish one entity or action from another entity or action without necessarily requiring or implying any actual such relationship or order between such entities or actions. Also, the terms "comprises," "comprising," or any other variation thereof, are intended to cover a non-exclusive inclusion, such that a process, method, article, or apparatus that comprises a list of elements does not include only those elements but may include other elements not expressly listed or inherent to such process, method, article, or apparatus. Without further limitation, an element defined by the phrase "comprising … …" does not exclude the presence of other identical elements in a process, method, article, or apparatus that comprises the element.
Fig. 1 is a schematic diagram of an embodiment of a folded cascode operational amplifier in the prior art.
In fig. 1, a nineteenth MOS transistor M11 'and an eleventh MOS transistor M3' form a pair of folded cascode pairs, a twentieth MOS transistor M12 'and a seventeenth MOS transistor M9' form a pair of folded cascode pairs, a ninth MOS transistor M1 'and a tenth MOS transistor M2' form a pair of cascode pairs connected in series, a fifteenth MOS transistor M7 'and a sixteenth MOS transistor M8' form a pair of cascode pairs connected in series, wherein M1 'and M2', M7 'and M8' are used to increase VO1And VO2The output impedance of (1). The thirteenth MOS transistor M5', the twelfth MOS transistor M4' and the eighteenth MOS transistor M10' all function as a constant current source, the twenty-first MOS transistor M13', the twenty-second MOS transistor M14' and the fourteenth MOS transistor M6' are positive feedback modules, and M6' is a constant current source of the positive feedback module.
In the prior art shown in fig. 1, all MOS transistors operate in the saturation region, and the output V of the folded cascode operational amplifierO1And VO2Directly connected to the input of a positive feedback block, in which a small signal current i is generatedmpf。
Figure 404354DEST_PATH_IMAGE001
Through n1 withnode n2 outputs the small signal current impfWhich flows into the output node together with the current gmvi generated in the operational amplifier.
Total gain of the same
Figure 383812DEST_PATH_IMAGE002
Comprises the following steps:
Figure 163549DEST_PATH_IMAGE003
because:
Figure 371807DEST_PATH_IMAGE004
therefore, the transconductance of the MOS transistors in the positive feedback module must be high enough to increase the gain, but not too high, because too high transconductance leads to instability due to process variations. Further operational amplifier output node VO1And VO2While the high swing of the positive feedback block changes the dc characteristic of the positive feedback block and causes non-linearity, another disadvantage of the conventional positive feedback block in fig. 1 is that the amount of phase margin is reduced.
In view of the above problems in the prior art, the present invention provides a folded cascode operational amplifier, which maintains the frequency response of the circuit unchanged on the premise of enhancing the dc gain, and the voltage swing of the input terminal of the positive feedback module is much smaller than the conventional voltage swing, so that the linearity and stability of the operational amplifier are higher, and the input common mode voltage of the positive feedback module in the operational amplifier architecture is higher, and no extra capacitor is added to the output node, so that the amounts of phase margin and the input common mode voltage are not reduced.
Fig. 2 is a schematic diagram of an embodiment of a folded cascode operational amplifier according to the present invention.
In this embodiment, the folded cascode operational amplifier proposed by the present invention includes a positive feedback module, a first current source M11, a second current source M3, a third current source M4, a first MOS transistor M1, a second MOS transistor M2, a third MOS transistor M5, a fourth MOS transistor M6, a seventh MOS transistor M9, a fifth MOS transistor M7, an eighth MOS transistor M10, and a sixth MOS transistor M8;
the first MOS transistor M1 and the third MOS transistor M5 form a pair of folded cascode pairs, the second MOS transistor M2 and the fourth MOS transistor M6 form a pair of folded cascode pairs, the seventh MOS transistor M9 and the fifth MOS transistor M7 form a pair of cascode pairs connected in series, and the eighth MOS transistor M10 and the sixth MOS transistor M8 form a pair of cascode pairs connected in series.
The power supply VDD is connected to the source of the first MOS transistor M1 and the source of the second MOS transistor M2 through the first current source M11, and the gate of the first MOS transistor M1 is used as the positive input terminal V of the amplifieri+The drain of the first MOS transistor M1 is connected to the source of the third MOS transistor M5 and grounded via the second current source M3, and the gate of the third MOS transistor M5 is connected to the bias voltage source VB2The drain of the third MOS transistor M5 is connected to the drain of the fifth MOS transistor M7, and the drain of the third MOS transistor M5 serves as the positive output terminal V of the amplifierO+The grid electrode of the fifth MOS tube M7 is connected with a bias voltage source VB3The source of the fifth MOS transistor M7 is connected to the drain of the seventh MOS transistor M9, a node n4 between the source of the fifth MOS transistor M7 and the drain of the seventh MOS transistor M9 serves as a positive input terminal and a negative output terminal of the positive feedback module, and the gate of the seventh MOS transistor M9 is connected to a bias voltage source VB4The source of the seventh MOS transistor M9 is connected to the first current source M11;
the grid of the second MOS transistor M2 is used as the negative input end V of the amplifieri-The drain of the second MOS transistor M2 is connected to the source of the fourth MOS transistor M6 and grounded via the third current source M4, and the gate of the fourth MOS transistor M6 is connected to the bias voltage source VB2The drain of the fourth MOS transistor M6 is connected to the drain of the sixth MOS transistor M8, and the drain of the fourth MOS transistor M6 serves as the negative output terminal V of the amplifierO-The grid electrode of the sixth MOS tube M8 is connected with a bias voltage source VB3The source of the sixth MOS transistor M8 is connected to the drain of the eighth MOS transistor M10, a node n5 between the source of the sixth MOS transistor M8 and the drain of the eighth MOS transistor M10 serves as a negative input end and a positive output end of the positive feedback module, and the gate of the eighth MOS transistor M10 is connected to a bias voltage source VB4The source of the eighth MOS transistor M10 is connected to the first current source M11.
The folding type cascode operational amplifier provided by the invention keeps the frequency response of the circuit unchanged on the premise of enhancing the direct current gain, the voltage swing of the input end of the positive feedback module is far smaller than the conventional voltage swing, so that the linearity of the operational amplifier is larger, the stability is higher, the input common-mode voltage of the positive feedback module in the operational amplifier framework is higher, and no extra capacitor is added to an output node, so that the pole and the phase margin can not be reduced.
In an embodiment of the invention, the first MOS transistor M1, the second MOS transistor M2, the seventh MOS transistor M9, the fifth MOS transistor M7, the eighth MOS transistor M10 and the sixth MOS transistor M8 are all PNP MOS transistors, and the third MOS transistor M5 and the fourth MOS transistor M6 are NPN MOS transistors.
In an embodiment of the present invention, the positive feedback module includes a first positive feedback MOS transistor Mp1, a second positive feedback MOS transistor Mp2, and a positive feedback current source Mp 3; the node n4 is connected with the gate of the first positive feedback MOS tube Mp1 and the drain of the second positive feedback MOS tube Mp2, the node n5 is connected with the drain of the first positive feedback MOS tube Mp1 and the gate of the second positive feedback MOS tube Mp2, and the source of the first positive feedback MOS tube Mp1 and the source of the second positive feedback MOS tube Mp2 are grounded through a positive feedback current source Mp 3.
In an embodiment of the invention, the first positive feedback MOS transistor Mp1 and the second positive feedback MOS transistor Mp2 are NPN-type MOS transistors.
In a specific embodiment of the present invention, the folded cascode operational amplifier of the present invention further comprises a first load capacitor and a second load capacitor; positive output terminal VO+Through the first load capacitor grounding, the negative output end VO-Through the second load capacitance to ground. The two load capacitances provided here facilitate the pole calculation.
Specifically, referring to the schematic diagram of an embodiment of the folded cascode operational amplifier provided in fig. 3 of the present invention, the first load capacitor further includes parasitic capacitances of a fifth MOS transistor M7 and a third MOS transistor M5, and the second load capacitor further includes parasitic capacitances of a sixth MOS transistor M8 and a fourth MOS transistor M6.
In an embodiment of the present invention, PNP MOS transistors may be used as the first current source M11, and NPN MOS transistors may be used as the second current source M3 and the third current source M4.
Specifically, referring to the schematic diagram of an embodiment of the folded cascode operational amplifier provided in fig. 3 of the present invention, the source of the first current source M11 is connected to the power supply, and the gate of the first current source M11 is connected to the bias voltage source VB5The drain of the first current source M11 is connected to the source of the first MOS transistor M1 and the source of the second MOS transistor M2; the drain of the second current source M3 is connected to the drain of the first MOS transistor M1, and the gate of the second current source M3 is connected to the bias voltage source VB1The source of the second current source M3 is grounded; the drain of the third current source M4 is connected to the drain of the second MOS transistor M2, and the gate of the third current source M4 is connected to the bias voltage source VB1And the source of the third current source M4 is grounded.
In an embodiment of the present invention, an NPN-type MOS transistor may be used as the positive feedback current source Mp 3.
Specifically, referring to the schematic diagram of an embodiment of the folded cascode operational amplifier provided in fig. 3 of the present invention, the source of the first positive feedback MOS transistor Mp1 and the source of the second positive feedback MOS transistor Mp2 are connected to the drain of the positive feedback current source Mp3, and the gate of the positive feedback current source Mp3 is connected to the bias voltage source VB6And the source stage of the positive feedback current source Mp3 is grounded.
When the folding type cascode operational amplifier provided by the invention works, all MOS (metal oxide semiconductor) tubes work in a saturation region, and the output resistance at Vo + is RoutThen Vo + is the transconductance of the first MOS transistor M1 and the input voltage Vin+And an output resistor RoutVo-is the transconductance of the second MOS transistor M2 and the input voltage Vin-And an output resistor RoutDue to the product of M9 and M7 on the output voltage Vout+And M10 and M8 to the output voltage Vout-So that the voltage at the node n4 is Vout+A times that of the voltage of the node n5 is Vout-A is the partial pressure coefficient, and a is less than 1. The voltage of the node n4 is Vout + of a times, and is converted into current through Mp1 to be output from n 5; of node n5The voltage is Vout-multiplied by a, and the voltage is converted into current through Mp2 and output from n 4.
The current generated by the positive feedback module and the current generated in the operational amplifier flow into the output node, so that the following results can be obtained:
Figure 186180DEST_PATH_IMAGE005
in summary, compared with the prior art, the voltage division coefficient a of the folded cascode operational amplifier provided by the present invention is smaller than 1, so that each positive feedback MOS transistor in the positive feedback module of the folded cascode operational amplifier can have a larger transconductance. Therefore, the current generated by the positive feedback module is increased, and the stability of the operational amplifier can be obviously improved. In addition, the amplitude of the voltage swing at the input end of the positive feedback module in the folded cascode operational amplifier is much smaller than that of the conventional folded cascode operational amplifier, so that the linearity of the folded cascode operational amplifier is higher. Meanwhile, only one seventh MOS tube M9 is arranged in a path between the input node n4 of the positive feedback module and a power supply, and only one eighth MOS tube M10 is arranged in a path between the input node n5 of the positive feedback module and the power supply, so that the operational amplifier has higher common-mode voltage of the positive feedback module, namely the power supply voltage minus the source-drain voltage of M9 and the power supply voltage minus the source-drain voltage of M10.
According to the folding type cascode operational amplifier provided by the invention, the frequency response of the circuit is kept unchanged on the premise of enhancing the direct current gain, the voltage swing of the input end of the positive feedback module is far smaller than the conventional voltage swing, so that the linearity of the operational amplifier is larger, the stability is higher, the input common-mode voltage of the positive feedback module in the operational amplifier framework is higher, and no extra capacitor is added to an output node, so that the pole and the phase margin can not be reduced.
In a specific embodiment of the present invention, an electronic device includes the folded cascode operational amplifier described in any of the above embodiments.
In the embodiments provided in the present application, it should be understood that the disclosed apparatus may be implemented in other manners. For example, the above-described apparatus embodiments are merely illustrative, and for example, a division of a unit is merely a logical division, and an actual implementation may have another division, for example, a plurality of units or components may be combined or integrated into another system, or some features may be omitted, or not executed. In addition, the shown or discussed mutual coupling or direct coupling or communication connection may be an indirect coupling or communication connection through some interfaces, devices or units, and may be in an electrical, mechanical or other form.
Units described as separate parts may or may not be physically separate, and parts displayed as units may or may not be physical units, may be located in one place, or may be distributed on a plurality of network units. Some or all of the units can be selected according to actual needs to achieve the purpose of the solution of the embodiment.
The above embodiments are merely examples, which are not intended to limit the scope of the present disclosure, and all equivalent structural changes made by using the contents of the specification and the drawings, or any other related technical fields, are also included in the scope of the present disclosure.

Claims (10)

1. A folding type cascode operational amplifier is characterized by comprising a positive feedback module, a first current source M11, a second current source M3, a third current source M4, a first MOS tube M1, a second MOS tube M2, a third MOS tube M5, a fourth MOS tube M6, a seventh MOS tube M9, a fifth MOS tube M7, an eighth MOS tube M10 and a sixth MOS tube M8;
a power supply VDD is connected to the source of the first MOS transistor M1 and the source of the second MOS transistor M2 through the first current source M11, the gate of the first MOS transistor M1 is used as the positive input terminal V of the amplifieri+The drain of the first MOS transistor M1 is connected to the source of the third MOS transistor M5 and grounded via the second current source M3, and the gate of the third MOS transistor M5 is connected to a bias voltage source VB2The third MOS transistorThe drain electrode of M5 is connected to the drain electrode of the fifth MOS transistor M7, and the drain electrode of the third MOS transistor M5 is used as the positive output end V of the amplifierO+The gate of the fifth MOS transistor M7 is connected with a bias voltage source VB3A source of the fifth MOS transistor M7 is connected to a drain of the seventh MOS transistor M9, a node n4 between the source of the fifth MOS transistor M7 and the drain of the seventh MOS transistor M9 is used as a positive input terminal and a negative output terminal of the positive feedback module, and a gate of the seventh MOS transistor M9 is connected to a bias voltage source VB4The source of the seventh MOS transistor M9 is connected with the first current source M11;
the grid electrode of the second MOS tube M2 is used as the negative input end V of the amplifieri-The drain of the second MOS transistor M2 is connected to the source of the fourth MOS transistor M6 and grounded via the third current source M4, and the gate of the fourth MOS transistor M6 is connected to the bias voltage source VB2The drain of the fourth MOS transistor M6 is connected to the drain of the sixth MOS transistor M8, and the drain of the fourth MOS transistor M6 serves as the negative output terminal V of the amplifierO-The gate of the sixth MOS transistor M8 is connected to the bias voltage source VB3A source of the sixth MOS transistor M8 is connected to a drain of the eighth MOS transistor M10, a node n5 between the source of the sixth MOS transistor M8 and the drain of the eighth MOS transistor M10 is used as a negative input end and a positive output end of the positive feedback module, and a gate of the eighth MOS transistor M10 is connected to the bias voltage source VB4The source of the eighth MOS transistor M10 is connected to the first current source M11.
2. The folded cascode operational amplifier according to claim 1, wherein said positive feedback module comprises a first positive feedback MOS transistor Mp1, a second positive feedback MOS transistor Mp2, and a positive feedback current source Mp 3;
the node n4 is connected to the gate of the first positive feedback MOS transistor Mp1 and the drain of the second positive feedback MOS transistor Mp2, the node n5 is connected to the drain of the first positive feedback MOS transistor Mp1 and the gate of the second positive feedback MOS transistor Mp2, and the source of the first positive feedback MOS transistor Mp1 and the source of the second positive feedback MOS transistor Mp2 are grounded through the positive feedback current source Mp 3.
3. The folded cascode operational amplifier of claim 1, further comprising a first load capacitance and a second load capacitance;
the positive output end VO+The negative output end V is grounded through the first load capacitorO-And the second load capacitor is grounded.
4. The folded cascode operational amplifier of claim 1,
the first MOS transistor M1, the second MOS transistor M2, the seventh MOS transistor M9, the fifth MOS transistor M7, the eighth MOS transistor M10 and the sixth MOS transistor M8 are all PNP MOS transistors, and the third MOS transistor M5 and the fourth MOS transistor M6 are NPN MOS transistors.
5. The folded cascode operational amplifier of claim 2,
the first positive feedback MOS transistor Mp1 and the second positive feedback MOS transistor Mp2 are NPN type MOS transistors.
6. The folded cascode operational amplifier of claim 1,
PNP MOS transistors are used as the first current source M11, and NPN MOS transistors are used as the second current source M3 and the third current source M4.
7. The folded cascode operational amplifier according to claim 6,
the source stage of the first current source M11 is connected with the power supply, and the gate of the first current source M11 is connected with a bias voltage source VB5The drain of the first current source M11 is connected to the source of the first MOS transistor M1 and the source of the second MOS transistor M2;
the drain of the second current source M3 is connected with the drain of the first MOS transistor M1, and the gate of the second current source M3 is connected with a bias voltage sourceVB1A source of the second current source M3 is grounded;
the drain of the third current source M4 is connected to the drain of the second MOS transistor M2, and the gate of the third current source M4 is connected to the bias voltage source VB1The source of the third current source M4 is grounded.
8. The folded cascode operational amplifier of claim 2,
an NPN type MOS tube is adopted as the positive feedback current source Mp 3.
9. The folded cascode operational amplifier of claim 8,
the source stage of the first positive feedback MOS tube Mp1 and the source stage of the second positive feedback MOS tube Mp2 are connected with the drain electrode of the positive feedback current source Mp3, and the gate electrode of the positive feedback current source Mp3 is connected with a bias voltage source VB6The source stage of the positive feedback current source Mp3 is grounded.
10. An electronic device comprising the folded cascode operational amplifier according to any one of claims 1-9.
CN202111368380.0A 2021-11-18 2021-11-18 Folding type cascode operational amplifier and electronic equipment Withdrawn CN113809998A (en)

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CN114884477A (en) * 2022-07-08 2022-08-09 深圳芯能半导体技术有限公司 Error amplifier circuit and converter

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CN102158180A (en) * 2011-03-28 2011-08-17 浙江大学 Switch-type operation amplifier with low power consumption

Patent Citations (1)

* Cited by examiner, † Cited by third party
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Application publication date: 20211217