CN116566336B - Chopper operational amplifier - Google Patents
Chopper operational amplifier Download PDFInfo
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- CN116566336B CN116566336B CN202310547781.5A CN202310547781A CN116566336B CN 116566336 B CN116566336 B CN 116566336B CN 202310547781 A CN202310547781 A CN 202310547781A CN 116566336 B CN116566336 B CN 116566336B
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- 238000001914 filtration Methods 0.000 claims abstract description 14
- 230000001105 regulatory effect Effects 0.000 claims description 5
- 238000010586 diagram Methods 0.000 description 6
- 238000000034 method Methods 0.000 description 6
- 238000005516 engineering process Methods 0.000 description 5
- 238000012986 modification Methods 0.000 description 2
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- 238000010587 phase diagram Methods 0.000 description 1
Classifications
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03F—AMPLIFIERS
- H03F1/00—Details of amplifiers with only discharge tubes, only semiconductor devices or only unspecified devices as amplifying elements
- H03F1/30—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters
- H03F1/303—Modifications of amplifiers to reduce influence of variations of temperature or supply voltage or other physical parameters using a switching device
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- Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
- Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
- Y02B—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO BUILDINGS, e.g. HOUSING, HOUSE APPLIANCES OR RELATED END-USER APPLICATIONS
- Y02B70/00—Technologies for an efficient end-user side electric power management and consumption
- Y02B70/10—Technologies improving the efficiency by using switched-mode power supplies [SMPS], i.e. efficient power electronics conversion e.g. power factor correction or reduction of losses in power supplies or efficient standby modes
Abstract
The invention provides a chopper operational amplifier, comprising: the device comprises an adjusting module, a first switch module, a second module and a filtering module; the control end of the first switch module and the control end of the second switch module alternately receive the first voltage and the second voltage; the first module, the first switch module and the second module form a first branch together, the first module, the second switch module and the second module form a second branch together, and under the condition that the first switch module receives the second voltage and the second switch module receives the first voltage, the first branch outputs the output voltage of the chopper operational amplifier through the filter module; and under the condition that the first switch module receives the first voltage and the second switch module receives the second voltage, the second branch circuit outputs the output voltage of the chopper operational amplifier through the filtering module. The demodulation action is realized by adopting the mode of voltage switching of the control end and switching of the output end, and the output voltage swing of the operational amplifier is improved.
Description
Technical Field
The invention relates to the technical field of operational amplifiers, in particular to a chopping operational amplifier.
Background
In the operational amplifier, no matter in open loop connection or feedback connection, when two input ends are grounded, the theoretical output voltage should be 0V, but due to factors such as mismatching of circuits and devices in CMOS process manufacturing, two input branches in the operational amplifier cannot be completely balanced, and a certain value exists in the output voltage. In order to enable the operational amplifier to output 0V voltage, an adjustable direct current voltage is often added to the input end, the direct current voltage is adjusted until the output voltage becomes 0V, and at the moment, the direct current voltage applied to the input end is the offset voltage. Due to the offset voltage, the output voltage can deviate, and the whole circuit performance is affected.
Although techniques for eliminating offset voltages exist, some techniques reduce the output voltage swing of an operational amplifier while eliminating offset voltages.
Disclosure of Invention
Therefore, the invention aims to solve the technical problem that the output voltage swing of the operational amplifier is reduced while eliminating the influence of offset voltage in the prior art, thereby providing the chopper operational amplifier.
According to a first aspect, an embodiment of the present invention provides a chopper operational amplifier, including:
the input end of the adjusting module is used for inputting working voltage, and the output end of the adjusting module is used for outputting modulating voltage;
the input end of the first module is used for inputting power supply voltage, and the output end of the first module is connected with the output end of the regulating module;
a first switch module;
the first end of the first switch module and the first end of the second switch module are connected with the output end of the first module; the control end of the first switch module and the control end of the second switch module are used for alternately receiving a first voltage and a second voltage;
the input end of the second module is connected with the second end of the first switch module and the second end of the second switch module, and the output end of the second module is grounded;
the input end of the filtering module is connected with the output end of the first switch module and the output end of the second switch module;
the first module, the first switch module and the second module form a first branch together, and the first module, the second switch module and the second module form a second branch together, wherein when the first switch module receives the second voltage and the second switch module receives the first voltage, the first branch outputs the output voltage of the chopper operational amplifier through the filter module; and under the condition that the first switch module receives the first voltage and the second switch module receives the second voltage, the second branch circuit outputs the output voltage of the chopping operational amplifier through the filtering module.
Optionally, the adjusting module includes:
the first end of the modulation unit is used as an input end of the adjusting module, and the second end of the modulation unit is used for outputting a modulation signal;
and the first end of the differential unit is connected with the second end of the modulation unit, and the second end is used as the output end of the regulation module.
Optionally, the first switch module includes:
the control end of the first switching device is used for receiving the first voltage or the second voltage, the first end is used as the first end of the first switching module, and the second end is used as the first output end of the first branch;
the control end of the second switching device is connected with the control end of the first switching device, the first end of the second switching device is used as the first end of the first switching module, and the second end of the second switching device is used as the second output end of the first branch;
the control end of the third switching device is used for receiving the first voltage or the second voltage, the first end is used as the second end of the first switching module, and the second end is connected with the second end of the first switching device;
and the control end of the fourth switching device is connected with the control end of the third switching device, the first end of the fourth switching device is used as the second end of the first switching module, and the second end of the fourth switching device is connected with the second end of the second switching device.
Optionally, the second switch module includes:
a fifth switching device, the control terminal is configured to receive the first voltage or the second voltage, the first terminal is used as a first terminal of the second switching module, and the second terminal is used as a first output terminal of the second branch;
a sixth switching device, the control end of which is connected with the control end of the fifth switching device, the first end of which is used as the first end of the second switching module, and the second end of which is used as the second output end of the second branch;
a seventh switching device, the control end of which is used for receiving the first voltage or the second voltage, the first end is used as the second end of the second switching module, and the second end is connected with the second end of the fifth switching device;
and the control end of the eighth switching device is connected with the control end of the seventh switching device, the first end of the eighth switching device is used as the second end of the second switching module, and the second end of the eighth switching device is connected with the second end of the sixth switching device.
Optionally, the first module includes:
a thirteenth switching device, the control end is used for inputting a third voltage, the first end is used for inputting a power supply voltage, and the second end is connected with the first end of the first switching device and the first end of the fifth switching device;
and a fourteenth switching device, wherein a control end of the fourteenth switching device is connected with a control end of the thirteenth switching device, a first end of the thirteenth switching device is connected with a first end of the thirteenth switching device, and a second end of the thirteenth switching device is connected with a first end of the second switching device and a first end of the sixth switching device.
Optionally, the second module includes:
a fifteenth switching device, the control end of which is used for inputting a fourth voltage, the first end of which is grounded, and the second end of which is connected with the first end of the third switching device and the first end of the seventh switching device;
and the control end of the sixteenth switching device is connected with the control end of the fifteenth switching device, the first end of the sixteenth switching device is grounded, and the second end of the sixteenth switching device is connected with the first end of the fourth switching device and the first end of the eighth switching device.
Optionally, the first module includes:
the first end of the first resistor is used for inputting power supply voltage, and the second end of the first resistor is connected with the first end of the first switching device and the first end of the fifth switching device; the first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is connected with the first end of the second switching device and the first end of the sixth switching device.
Optionally, the second module includes:
the first end of the third resistor is connected with the first end of the third switching device and the first end of the seventh switching device, and the second end of the third resistor is grounded; the first end of the fourth resistor is connected with the first end of the fourth switching device and the first end of the eighth switching device, and the second end of the fourth resistor is grounded.
Optionally, the differential unit includes:
the control end of the ninth switching device is used for receiving the forward working voltage, the first end of the ninth switching device is grounded, and the second end of the ninth switching device is connected with the first end of the first switching device and the first end of the fifth switching device; the control end of the tenth switching device is used for receiving the negative working voltage, the first end of the tenth switching device is grounded, and the second end of the tenth switching device is connected with the first end of the second switching device and the first end of the sixth switching device.
Optionally, the differential unit further includes:
the control end of the eleventh switching device is used for receiving the forward working voltage, the first end of the eleventh switching device is used for inputting the power voltage, and the second end of the eleventh switching device is connected with the first end of the third switching device and the first end of the seventh switching device; the control end of the twelfth switching device is used for receiving the negative working voltage, the first end of the twelfth switching device is used for inputting the power voltage, and the second end of the twelfth switching device is connected with the first end of the fourth switching device and the first end of the eighth switching device.
The technical scheme of the invention has the following advantages:
the invention provides a chopper operational amplifier, which alternately receives a first voltage and a second voltage through a control end of a first switch module and a control end of a second switch module, and the first branch and the second branch alternately work to alternately output the output voltage of the chopper operational amplifier. The demodulation action is realized by adopting the mode of voltage switching at the control end and switching at the output end, a demodulation circuit at the output end of a chopper operational amplifier in some technologies is removed, the output voltage swing of the operational amplifier is improved, and the gain balance at the two output ends is realized.
Drawings
In order to more clearly illustrate the embodiments of the present invention or the technical solutions in the prior art, the drawings that are needed in the description of the embodiments or the prior art will be briefly described, and it is obvious that the drawings in the description below are some embodiments of the present invention, and other drawings can be obtained according to the drawings without inventive effort for a person skilled in the art.
FIG. 1 is a schematic diagram of a configuration of a chopper operational amplifier in some techniques in accordance with an embodiment of the present application;
fig. 2 is a block diagram showing a specific example of a conventional modulation/demodulation circuit in the embodiment of the present application;
FIG. 3 is a block diagram of a specific example of a chopper operational amplifier in an embodiment of the present application;
FIG. 4 is a schematic diagram of another specific example of a chopper operational amplifier in an embodiment of the present application;
FIG. 5 is a phase diagram of a specific example of a clock signal in an embodiment of the present application;
reference numerals illustrate: the device comprises a 1-adjusting module, a 11-modulating unit, a 12-differentiating unit, a 121-first differentiating subunit, a 122-second differentiating subunit, a 2-first switching module, a 3-second switching module, a 4-first module, a 5-second module and a 6-filtering module.
Detailed Description
The following description of the embodiments of the present invention will be made apparent and fully in view of the accompanying drawings, in which some, but not all embodiments of the invention are shown. All other embodiments, which can be made by those skilled in the art based on the embodiments of the invention without making any inventive effort, are intended to be within the scope of the invention.
In the description of the present invention, it should be noted that the directions or positional relationships indicated by the terms "center", "upper", "lower", "left", "right", "vertical", "horizontal", "inner", "outer", etc. are based on the directions or positional relationships shown in the drawings, are merely for convenience of describing the present invention and simplifying the description, and do not indicate or imply that the devices or elements referred to must have a specific orientation, be configured and operated in a specific orientation, and thus should not be construed as limiting the present invention. Furthermore, the terms "first," "second," and "third" are used for descriptive purposes only and are not to be construed as indicating or implying relative importance.
In the description of the present invention, it should be noted that, unless explicitly specified and limited otherwise, the terms "mounted," "connected," and "connected" are to be construed broadly, and may be either fixedly connected, detachably connected, or integrally connected, for example; can be mechanically or electrically connected; the two components can be directly connected or indirectly connected through an intermediate medium, or can be communicated inside the two components, or can be connected wirelessly or in a wired way. The specific meaning of the above terms in the present invention will be understood in specific cases by those of ordinary skill in the art.
In addition, the technical features of the different embodiments of the present invention described below may be combined with each other as long as they do not collide with each other.
Referring to fig. 1, a schematic diagram of a chopper operational amplifier in some technologies is shown, and referring to fig. 2, a schematic diagram of a conventional modulation and demodulation circuit commonly used in chopper operational amplifiers in some technologies is shown.
In some technologies, an independent modulation and demodulation mode is mainly adopted to modulate an offset voltage to a high-frequency end, then the offset voltage is filtered through low-pass filtering, and a data signal is demodulated back to a baseband after being modulated, so that the influence of the offset voltage is eliminated. However, the chopping technique adopts an independent modulation/demodulation circuit to perform modulation and demodulation at the input/output node of high resistance, so that the output voltage swing of the operational amplifier is reduced.
Take fig. 1 and fig. 2 as an example. In some chopper operational amplifiers, an independent demodulation circuit is added to the output end, and a mos switch tube in the demodulation circuit affects the single-ended output swing of the chopper operational amplifier. Referring to fig. 1 and 2, the single-ended output voltage swing is: vdd- (vds_q19+vds_q21+vds_q23+vds_q25+vds_q17), the output gain is: gm [ (ro 19+ ro 21)/(ro 23+ ro25+ rds 17) ], wherein the mos transistors Q19, Q17 influence the output voltage and the output gain of the chopper operational amplifier, thereby reducing the output voltage swing of the operational amplifier.
In view of the above, the present application provides a chopper operational amplifier that can solve the above-described problems.
Referring to fig. 3, the present embodiment provides a chopper operational amplifier, which includes an adjusting module 1, a first switch module 2, a second switch module 3, a first module 4, a second module 5, and a filtering module 6, as follows.
The input end of the regulating module 1 is used for inputting working voltage, and the output end of the regulating module is used for outputting modulation voltage;
the input end of the first module 4 is used for inputting power supply voltage, and the output end of the first module is connected with the output end of the regulating module 1;
a first switch module 2;
the first end of the first switch module 2 and the first end of the second switch module 3 are connected with the output end of the first module 4; the control end of the first switch module 2 and the control end of the second switch module 3 are used for alternately receiving a first voltage and a second voltage;
the input end of the second module 5 is connected with the second end of the first switch module 2 and the second end of the second switch module 3, and the output end of the second module is grounded gnd;
the input end of the filtering module 6 is connected with the output end of the first switch module and the output end of the second switch module;
the first module 4, the first switch module 2 and the second module 5 together form a first branch, and the first module 4, the second switch module 3 and the second module 5 together form a second branch, wherein the output voltage of the chopper operational amplifier is output by the first branch through the filter module 6 when the first switch module 2 receives the second voltage and the second switch module 3 receives the first voltage; in the case where the first switching module 2 receives the first voltage and the second switching module 3 receives the second voltage, the output voltage of the chopper operational amplifier is output by the second branch through the filtering module 6.
In this embodiment, taking fig. 3 as an example, the working voltage in this example may be the voltage to be amplified by the chopper operational amplifier, the first voltage may be the power supply voltage Vdd or the ground voltage Vss, and the second voltage may be the bias voltage vb2 or vb3. When the first switch module 2 receives the second voltage vb2 or vb3 and the second switch module 3 receives the first voltage Vdd or Vss, the first branch outputs the output voltage of the chopper operational amplifier after passing through the filter module 6; when the first switch module 2 receives the first voltage Vdd or Vss and the second switch module 3 receives the second voltage vb2 or vb3, the second branch outputs the output voltage of the chopper operational amplifier after passing through the filter module 6. The output end of the first branch circuit comprises a first output end and a second output end, and the output end of the second branch circuit also comprises the first output end and the second output end. The first output end and the second output end of the first branch, and the first output end and the second output end of the second branch are connected with the input end of the filtering module 6.
The control end of the first switch module 2 and the control end of the second switch module 3 alternately receive the first voltage and the second voltage, and the first branch and the second branch alternately work to alternately output the output voltage of the chopper operational amplifier. The demodulation action is realized by adopting the mode of voltage switching at the control end and switching at the output end, a demodulation circuit at the output end of a chopper operational amplifier in some technologies is removed, the output voltage swing of the operational amplifier is improved, and the gain balance at the two output ends is realized.
As shown in fig. 3, as an alternative implementation manner, in an embodiment of the present invention, the adjusting module 1 includes:
a modulation unit 11, a first end is used as an input end of the adjusting module 1, and a second end is used for outputting a modulation signal;
the first end of the differential unit 12 is connected with the second end of the modulation unit 11, and the second end is used as the output end of the adjusting module 1.
In this embodiment, the modulation unit 11 at the input end may also employ a modulation circuit as shown in fig. 3, for modulating the input operating voltage. The differential unit 12 adopts a differential pair design, and can differentially amplify the signal modulated by the modulating unit 11, and input the amplified signal into the first branch or the second branch.
As shown in fig. 3, as an alternative implementation manner, in an embodiment of the present invention, the first switch module 2 includes:
a first switching device Q7, a control terminal for receiving the first voltage Vdd or Vss or the second voltage vb2 or vb3, a first terminal being a first terminal of the first switching module 2, and a second terminal being a first output terminal voutn of the first branch;
the control end of the second switching device Q8 is connected with the control end of the first switching device, the first end is used as the first end of the first switching module 2, and the second end is used as the second output end voutp of the first branch;
a third switching device Q11, a control terminal for receiving the first voltage Vdd or Vss or the second voltage vb2 or vb3, a first terminal being a second terminal of the first switching module 2, the second terminal being connected to a second terminal of the first switching device Q7;
and a control end of the fourth switching device Q12 is connected with a control end of the third switching device Q11, a first end is used as a second end of the first switching module 2, and a second end is connected with a second end of the second switching device Q8.
In this embodiment, as shown in fig. 3, when the control terminal of the first switching device Q7 and the control terminal of the second switching device Q8 receive the first voltage Vdd, the first switching device Q7 and the second switching device Q8 are turned off; when the control end of the third switching device Q11 and the control end of the fourth switching device Q12 receive the first voltage Vss, the third switching device Q11 and the fourth switching device Q12 are cut off; at this time, the first switch module 2 is in the off state. When the control end of the first switching device Q7 and the control end of the second switching device Q8 receive the second voltage vb2, the first switching device Q7 and the second switching device Q8 are conducted; when the control end of the third switching device Q11 and the control end of the fourth switching device Q12 receive the second voltage vb3, the third switching device Q11 and the fourth switching device Q12 are turned on; at this time, the first switch module 2 is in an operating state, and the first branch outputs voltages voutn, voutp. The output voltages voutn, voutp may be further processed as output voltages vout of the chopper operational amplifier.
In this embodiment, the filtering module 6 may be used to filter out the offset voltage modulated to the high frequency end in the output voltages voutn and voutp, so as to output the output voltage vout of the chopper operational amplifier.
As shown in fig. 3, as an alternative implementation manner, in an embodiment of the present invention, the second switch module 3 includes:
a fifth switching device Q9, the control terminal of which is configured to receive the first voltage or the second voltage, the first terminal being a first terminal of the second switching module 3, the second terminal being a first output terminal voutp of the second branch;
a control end of the sixth switching device Q10 is connected to a control end of the fifth switching device Q9, a first end is used as a first end of the second switching module 3, and a second end is used as a second output end voutn of the second branch;
a seventh switching device Q13, a control terminal for receiving the first voltage or the second voltage, a first terminal serving as a second terminal of the second switching module 3, and a second terminal connected to a second terminal of the fifth switching device Q9;
an eighth switching device Q14, a control terminal of which is connected to the control terminal of the seventh switching device Q13, a first terminal of which is used as the second terminal of the second switching module 3, and a second terminal of which is connected to the second terminal of the sixth switching device Q10.
In this embodiment, as shown in fig. 3, when the control terminal of the fifth switching device Q9 and the control terminal of the sixth switching device Q10 receive the first voltage Vdd, the fifth switching device Q9 and the sixth switching device Q10 are turned off; when the control end of the seventh switching device Q13 and the control end of the eighth switching device Q14 receive the first voltage Vss, the seventh switching device Q13 and the eighth switching device Q14 are turned off; at this time, the second switch module 3 is in the off state. When the control end of the fifth switching device Q9 and the control end of the sixth switching device Q10 receive the second voltage vb2, the fifth switching device Q9 and the sixth switching device Q10 are turned on; when the control end of the seventh switching device Q13 and the control end of the eighth switching device Q14 receive the second voltage vb3, the seventh switching device Q13 and the eighth switching device Q14 are turned on; at this time, the second switch module 3 is in an operating state, and the second branch outputs voltages voutn, voutp. The output voltages voutn, voutp may be further processed by a filtering module 6 as output voltages of a chopper operational amplifier.
As shown in fig. 3, as an alternative implementation manner, in an embodiment of the present invention, the first module 4 includes:
a thirteenth switching device Q5, a control terminal for inputting a third voltage vb1, a first terminal for inputting a power voltage vdd, and a second terminal connected to the first terminal of the first switching device Q7 and the first terminal of the fifth switching device Q9;
and a fourteenth switching device Q6, a control terminal of which is connected to the control terminal of the thirteenth switching device Q5, a first terminal of which is connected to the first terminal of the thirteenth switching device Q5, and a second terminal of which is connected to the first terminal of the second switching device Q8 and the first terminal of the sixth switching device Q10. Wherein the third voltage may be a bias voltage.
As shown in fig. 3, as an alternative implementation manner, in an embodiment of the present invention, the second module 5 includes:
a fifteenth switching device Q15, a control terminal for inputting a fourth voltage vb4, a first terminal connected to ground gnd, and a second terminal connected to the first terminal of the third switching device Q11 and the first terminal of the seventh switching device Q13;
a sixteenth switching device Q16, a control terminal is connected to the control terminal of the fifteenth switching device Q15, a first terminal is grounded gnd, and a second terminal is connected to the first terminal of the fourth switching device Q12 and the first terminal of the eighth switching device Q14. Wherein the fourth voltage may be a bias voltage.
As shown in fig. 4, as an alternative implementation manner, in an embodiment of the present invention, the first module 4 includes:
a first resistor R1 and a second resistor R2, wherein a first end of the first resistor R1 is used for inputting a power supply voltage vdd, and a second end of the first resistor R1 is connected with a first end of the first switching device Q7 and a first end of the fifth switching device Q9; the first end of the second resistor R2 is connected to the first end of the first resistor R1, and the second end is connected to the first end of the second switching device Q8 and the first end of the sixth switching device Q10.
As shown in fig. 4, as an alternative implementation manner, in an embodiment of the present invention, the second module 5 includes:
the first end of the third resistor R3 is connected with the first end of the third switching device Q11 and the first end of the seventh switching device Q13, and the second end of the third resistor R3 is grounded; the first terminal of the fourth resistor R4 is connected to the first terminal of the fourth switching device Q12 and the first terminal of the eighth switching device Q14, and the second terminal is grounded gnd.
As shown in fig. 3, as an alternative implementation manner, in an embodiment of the present invention, the differential unit 12 includes:
the first differential subunit 121 includes a ninth switching device Q3 and a tenth switching device Q4, where a control end of the ninth switching device Q3 is configured to receive the forward operating voltage vin+, a first end of the ninth switching device Q3 is grounded gnd, and a second end of the ninth switching device Q3 is connected to a first end of the first switching device Q7 and a first end of the fifth switching device Q9; the control terminal of the tenth switching device Q4 is configured to receive the negative operating voltage vin-, the first terminal is grounded gnd, and the second terminal is connected to the first terminal of the second switching device Q8 and the first terminal of the sixth switching device Q10.
As shown in fig. 3, in an embodiment of the present invention, the differential unit 12 further includes:
a second differential subunit 122, including an eleventh switching device Q1 and a twelfth switching device Q2, where a control end of the eleventh switching device Q1 is configured to receive the forward operating voltage vin+, a first end is configured to input the power supply voltage, and a second end is connected to a first end of the third switching device Q11 and a first end of the seventh switching device Q13; the control terminal of the twelfth switching device Q2 is configured to receive the negative operating voltage vin-, the first terminal is configured to input the power voltage vdd, and the second terminal is connected to the first terminal of the fourth switching device Q12 and the first terminal of the eighth switching device Q14.
The output end of the first differential subunit 121 and the output end of the second differential subunit 122 may output the modulation voltage, which is used for inputting the first branch or the second branch.
The operational amplifier provided in this embodiment adopts a rail-to-rail structure, increases the input range of the operational amplifier, and can vary the input voltage from 0V to the power supply voltage vdd.
The switching tube in this embodiment may be a MOS tube or a biplatin triode, and the MOS tube is taken as an example, the control end may be a gate of the MOS tube, the first end may be a source of the MOS tube, and the second end may be a drain of the MOS tube.
In this embodiment, the alternate receiving of the first voltage and the second voltage may be switched by a switch. And the switching of the switch may be with a clock signal as shown in fig. 5. Specifically, the implementation manner of the chopper operational amplifier provided in the present embodiment is as follows:
when the clock signal is in the phase B, the control ends of the first switching device Q7 and the second switching device Q8 receive a second voltage vb2 through a switch; the control ends of the third switching device Q11 and the fourth switching device Q12 receive the second voltage vb3 through a switch; meanwhile, the control ends of the fifth switching device Q9 and the sixth switching device Q10 receive the first voltage vdd through a switch; the control terminals of the seventh and eighth switching devices Q13, Q14 receive the first voltage vss through the switch. At this time, the fifth, sixth, seventh, and eighth switching devices Q9, Q10, Q13, and Q14 are turned off, and the first, second, third, and fourth switching devices Q7, Q8, Q11, and Q12 are turned on; at this time, the voltage (outp) is outputted through the second terminals of the first and third switching devices Q7 and Q11, and the second terminals of the second and fourth switching devices Q8 and Q12.
When the clock signal is in the phase A, the control ends of the first switching device Q7 and the second switching device Q8 receive a first voltage vdd through a switch; the control ends of the third switching device Q11 and the fourth switching device Q12 receive the first voltage vss through a switch; meanwhile, the control ends of the fifth switching device Q9 and the sixth switching device Q10 receive the second voltage vb2 through the switch; the control terminals of the seventh and eighth switching devices Q13, Q14 receive the second voltage vb3 through the switch. At this time, the fifth, sixth, seventh, and eighth switching devices Q9, Q10, Q13, and Q14 are turned on, and the first, second, third, and fourth switching devices Q7, Q8, Q11, and Q12 are turned off; at this time, the voltage (outp) is outputted through the second terminals of the fifth and seventh switching devices Q9 and Q13, and the second terminals of the sixth and eighth switching devices Q10 and Q14.
In this embodiment, the voltage switching at the control terminal and the switching at the output terminal are adopted, so that the introduction of an additional demodulation circuit can be avoided. The single ended output voltage swing as shown in fig. 3 is: vdd- (vds_q5+vds_q7+vds_q11+vds_q15); the output gain is gm (ro 5+ro 7)/(ro 11+ro 15). It can be seen that the chopped op-amp provided in this embodiment has an output gain that is more balanced than the output voltage swing of the chopped op-amp in some techniques by one Vds.
It is apparent that the above examples are given by way of illustration only and are not limiting of the embodiments. Other variations or modifications of the above teachings will be apparent to those of ordinary skill in the art. It is not necessary here nor is it exhaustive of all embodiments. While still being apparent from variations or modifications that may be made by those skilled in the art are within the scope of the invention.
Claims (8)
1. A chopper operational amplifier, comprising:
the input end of the adjusting module is used for inputting working voltage, and the output end of the adjusting module is used for outputting modulating voltage;
the input end of the first module is used for inputting power supply voltage, and the output end of the first module is connected with the output end of the regulating module;
a first switch module;
the first end of the first switch module and the first end of the second switch module are connected with the output end of the first module; the control end of the first switch module and the control end of the second switch module are used for alternately receiving a first voltage and a second voltage;
the input end of the second module is connected with the second end of the first switch module and the second end of the second switch module, and the output end of the second module is grounded; the first module, the second module, the first switch module and the second switch module are all used for increasing the output voltage of the chopper operational amplifier;
the input end of the filtering module is connected with the output end of the first switch module and the output end of the second switch module;
the first module, the first switch module and the second module form a first branch together, and the first module, the second switch module and the second module form a second branch together, wherein when the first switch module receives the second voltage and the second switch module receives the first voltage, the first branch outputs the output voltage of the chopper operational amplifier through the filter module; outputting, by the second branch, an output voltage of the chopper operational amplifier through the filtering module, with the first switching module receiving the first voltage and the second switching module receiving the second voltage;
the first switch module includes:
the control end of the first switching device is used for receiving the first voltage or the second voltage, the first end is used as the first end of the first switching module, and the second end is used as the first output end of the first branch;
the control end of the second switching device is connected with the control end of the first switching device, the first end of the second switching device is used as the first end of the first switching module, and the second end of the second switching device is used as the second output end of the first branch;
the control end of the third switching device is used for receiving the first voltage or the second voltage, the first end is used as the second end of the first switching module, and the second end is connected with the second end of the first switching device;
the control end of the fourth switching device is connected with the control end of the third switching device, the first end of the fourth switching device is used as the second end of the first switching module, and the second end of the fourth switching device is connected with the second end of the second switching device;
the second switch module includes:
a fifth switching device, the control terminal is configured to receive the first voltage or the second voltage, the first terminal is used as a first terminal of the second switching module, and the second terminal is used as a first output terminal of the second branch;
a sixth switching device, the control end of which is connected with the control end of the fifth switching device, the first end of which is used as the first end of the second switching module, and the second end of which is used as the second output end of the second branch;
a seventh switching device, the control end of which is used for receiving the first voltage or the second voltage, the first end is used as the second end of the second switching module, and the second end is connected with the second end of the fifth switching device;
and the control end of the eighth switching device is connected with the control end of the seventh switching device, the first end of the eighth switching device is used as the second end of the second switching module, and the second end of the eighth switching device is connected with the second end of the sixth switching device.
2. The chopper operational amplifier of claim 1, wherein the regulation module comprises:
the first end of the modulation unit is used as an input end of the adjusting module, and the second end of the modulation unit is used for outputting a modulation signal;
and the first end of the differential unit is connected with the second end of the modulation unit, and the second end is used as the output end of the regulation module.
3. The chopper operational amplifier of claim 2, wherein the first module comprises:
a thirteenth switching device, the control end is used for inputting a third voltage, the first end is used for inputting a power supply voltage, and the second end is connected with the first end of the first switching device and the first end of the fifth switching device;
and a fourteenth switching device, wherein a control end of the fourteenth switching device is connected with a control end of the thirteenth switching device, a first end of the thirteenth switching device is connected with a first end of the thirteenth switching device, and a second end of the thirteenth switching device is connected with a first end of the second switching device and a first end of the sixth switching device.
4. The chopper operational amplifier of claim 2, wherein the second module comprises:
a fifteenth switching device, the control end of which is used for inputting a fourth voltage, the first end of which is grounded, and the second end of which is connected with the first end of the third switching device and the first end of the seventh switching device;
and the control end of the sixteenth switching device is connected with the control end of the fifteenth switching device, the first end of the sixteenth switching device is grounded, and the second end of the sixteenth switching device is connected with the first end of the fourth switching device and the first end of the eighth switching device.
5. The chopper operational amplifier of claim 2, wherein the first module comprises:
the first end of the first resistor is used for inputting power supply voltage, and the second end of the first resistor is connected with the first end of the first switching device and the first end of the fifth switching device; the first end of the second resistor is connected with the first end of the first resistor, and the second end of the second resistor is connected with the first end of the second switching device and the first end of the sixth switching device.
6. The chopper operational amplifier of claim 2, wherein the second module comprises:
the first end of the third resistor is connected with the first end of the third switching device and the first end of the seventh switching device, and the second end of the third resistor is grounded; the first end of the fourth resistor is connected with the first end of the fourth switching device and the first end of the eighth switching device, and the second end of the fourth resistor is grounded.
7. The chopper operational amplifier of claim 2, wherein the differential unit comprises:
the control end of the ninth switching device is used for receiving the forward working voltage, the first end of the ninth switching device is grounded, and the second end of the ninth switching device is connected with the first end of the first switching device and the first end of the fifth switching device; the control end of the tenth switching device is used for receiving the negative working voltage, the first end of the tenth switching device is grounded, and the second end of the tenth switching device is connected with the first end of the second switching device and the first end of the sixth switching device.
8. The chopper operational amplifier of claim 7, wherein the differential unit further comprises:
the control end of the eleventh switching device is used for receiving the forward working voltage, the first end of the eleventh switching device is used for inputting the power voltage, and the second end of the eleventh switching device is connected with the first end of the third switching device and the first end of the seventh switching device; the control end of the twelfth switching device is used for receiving the negative working voltage, the first end of the twelfth switching device is used for inputting the power voltage, and the second end of the twelfth switching device is connected with the first end of the fourth switching device and the first end of the eighth switching device.
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| US7310016B2 (en) * | 2005-07-13 | 2007-12-18 | Texas Instruments Incorporated | Chopper-stabilized operational amplifier and method |
| US8604762B2 (en) * | 2006-05-25 | 2013-12-10 | Texas Instruments Incorporated | Low noise, low dropout regulators |
| US8076973B2 (en) * | 2007-02-22 | 2011-12-13 | Intelleflex Corporation | Fully differential amplifier with continuous-time offset reduction |
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| US6380801B1 (en) * | 2000-06-08 | 2002-04-30 | Analog Devices, Inc. | Operational amplifier |
| CN102347738A (en) * | 2010-08-04 | 2012-02-08 | 中国科学院微电子研究所 | Two-stage fully-differential low-noise low-offset chopping operational amplifier |
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