CN111721986A - Wide input common mode voltage range current detection amplifier circuit - Google Patents

Wide input common mode voltage range current detection amplifier circuit Download PDF

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Publication number
CN111721986A
CN111721986A CN202010433759.4A CN202010433759A CN111721986A CN 111721986 A CN111721986 A CN 111721986A CN 202010433759 A CN202010433759 A CN 202010433759A CN 111721986 A CN111721986 A CN 111721986A
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China
Prior art keywords
field
resistor
operational amplifier
amplifier circuit
electrode
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CN202010433759.4A
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CN111721986B (en
Inventor
王飞
王云
郑鲲鲲
郝炳贤
任广辉
薛静
王桂磊
亨利·阿达姆松
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Guangdong Greater Bay Area Institute of Integrated Circuit and System
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Guangdong Greater Bay Area Institute of Integrated Circuit and System
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    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R1/00—Details of instruments or arrangements of the types included in groups G01R5/00 - G01R13/00 and G01R31/00
    • G01R1/30—Structural combination of electric measuring instruments with basic electronic circuits, e.g. with amplifier
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
    • G01R19/00—Arrangements for measuring currents or voltages or for indicating presence or sign thereof
    • G01R19/0092—Arrangements for measuring currents or voltages or for indicating presence or sign thereof measuring current only

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  • General Physics & Mathematics (AREA)
  • Amplifiers (AREA)

Abstract

The invention discloses a current detection amplifier circuit with a wide input common mode voltage range, which belongs to the technical field of current detection amplifier circuits, and realizes the common mode voltage input in an ultra-wide range by using an operational amplifier with a limited input common mode range of a low-voltage domain during current detection, the voltage drop of high voltage is reduced on a resistor, all operational circuits are realized by low-voltage devices, a high-voltage source is not required to be additionally generated and used, and the required functions can be realized in an ultra-small area.

Description

Wide input common mode voltage range current detection amplifier circuit
Technical Field
The invention relates to a current detection amplifier circuit, in particular to a current detection amplifier circuit with a wide input common-mode voltage range, and belongs to the technical field of current detection amplifier circuits.
Background
The load current needs to be detected in real time in a power supply system, when a detection point is on a power line or a ground line in the prior art, the input common mode voltage is power supply voltage or ground line voltage, a comparator is easy to realize, when the current on the load needs to be directly detected, the common mode voltage changes in a large range when the load is switched on and switched off, even the common mode voltage is higher than the power supply voltage or lower than the ground line level due to inductive load and connection line inductance, the input common mode range of a corresponding operational amplifier needs to be from negative voltage to higher than the power supply voltage, an extra high-voltage device needs to occupy the chip area, and the cost is increased.
Disclosure of Invention
The invention mainly aims to provide a current detection amplifier circuit with a wide input common-mode voltage range.
The purpose of the invention can be achieved by adopting the following technical scheme:
a current detection amplifier circuit with a wide input common-mode voltage range comprises an operational amplifier OPA1, wherein the anode of the operational amplifier OPA1 is connected with a reference level, the cathode of the operational amplifier OPA1 is electrically connected with the source of a field-effect tube MN1 and the source of a field-effect tube MP1, the cathode of the operational amplifier OPA1 is further connected with one end of a resistor R2, the external terminal SN at the other end of the resistor R2 is an input detection end, the output end of the operational amplifier OPA1 is electrically connected with the gate of a field-effect tube MN1, the gate of a field-effect tube MP1, the gate of a field-effect tube MP2 and the gate of a field-effect tube MN2, the drain of a field-effect tube MP1 is connected with the drain of a field-effect tube MN3, and the.
Preferably, the source of the field-effect transistor MN3 is further connected to the source of the field-effect transistor MN4, the gate of the field-effect transistor MN3 is connected to the gate of the field-effect transistor MN4, and the drain of the field-effect transistor MN3 is connected to the gate of the field-effect transistor MN 3.
Preferably, the source of the field effect transistor MN2 is connected to the drain of the field effect transistor MP2, the drain of the field effect transistor MP2 is connected to the drain of the field effect transistor MN4, and the drain of the field effect transistor MP4 is connected to the drain of the field effect transistor MN 2.
Preferably, the gate of the fet MP4 is connected to the gate of the fet MP3, the sources of the fets MP3 and MP4 are connected to each other and to the power VCC, the drain of the fet MP3 is connected to the gate of the fet MP3, and the source of the fet MN2 is connected to one end of the resistor R1.
Preferably, the other end of the resistor R1 is connected to the external terminal SP as an input detection end, one end of the resistor R1 is connected to one end of the resistor R2, one end of the resistor R1 is connected to one end of the resistor R3, and one end of the resistor R3 is further connected to the negative electrode of the operational amplifier OPA 2.
Preferably, the positive electrode of the operational amplifier OPA2 is connected to the negative electrode of the operational amplifier OPA1, the output terminal of the operational amplifier OPA2 outputs a voltage signal, and the other end of the resistor R3 is connected to the output terminal of the operational amplifier OPA 2.
Preferably, VCC is an internal logic low voltage level, MPx is a PMOS transistor, MNx is an NMOS transistor, Rx is a resistor, and OPAx is an operational amplifier.
Preferably, the OPA1, MN1, MP1 on the left is an operational amplifier circuit with classmab output stage, which functions to make the a point level equal to the Vref level.
Preferably, the MP3, MP4 current mirror and MN3, MN4 current mirror will mirror the current in R2 to make it flow through resistor R1.
Preferably, MN2 and MP2 are cascade MOS of current mirror for improving channel length modulation effect of current mirror MOS
The invention has the beneficial technical effects that:
according to the current detection amplifier circuit with the wide input common mode voltage range, the common mode voltage input in the ultra-wide range is realized by using the operational amplifier with the limited input common mode range in the low voltage domain during current detection, the high voltage drop is reduced on the resistor, all the operational circuits are realized by low-voltage devices, a high-voltage source does not need to be additionally generated and used, and the required functions can be realized in an ultra-small area.
Drawings
FIG. 1 is a circuit diagram of a current detection circuit in the prior art;
FIG. 2 is a circuit diagram of a prior art current detection point selection circuit;
fig. 3 is a circuit diagram of a current sense circuit for a wide input common mode voltage range input common film voltage of a preferred embodiment of a wide input common mode voltage range current sense amplifier circuit according to the present invention.
Detailed Description
In order to make the technical solutions of the present invention more clear and definite for those skilled in the art, the present invention is further described in detail below with reference to the examples and the accompanying drawings, but the embodiments of the present invention are not limited thereto.
As shown in fig. 3, the current sense amplifier circuit with a wide input common mode voltage range includes an operational amplifier OPA1, the positive electrode of the operational amplifier OPA1 is connected to a reference level, the negative electrode of the operational amplifier OPA1 is electrically connected to the source of the fet MN1 and the source of the fet MP1, the negative electrode of the operational amplifier OPA1 is further connected to one end of a resistor R2, the external terminal SN at the other end of the resistor R2 is an input detection terminal, the output end of the operational amplifier OPA1 is electrically connected to the gate of the fet MN1, the gate of the fet MP1, the gate of the fet MP2 and the gate of the fet MN2, the drain of the fet MP1 is connected to the drain of the fet MN3, and the source of the fet 3 is grounded.
VCC is an internal logic low voltage level (e.g., 3.3V), MPx is a PMOS transistor, MNx is an NMOS transistor, Rx is a resistor, and OPAx is an operational amplifier.
The OPA1, MN1, MP1 on the left is an operational amplifier circuit with classmab output stage, which acts to make the a point level equal to the Vref level. The MP3, MP4 current mirror and MN3, MN4 current mirror will mirror the current in R2 to make it flow through resistor R1. MN2 and MP2 are cascade MOS of current mirrors for improving channel length modulation effect of the current mirror MOS.
The loop of OPA2 forces the B point level to be equal to the a point level (i.e., Vref level).
IR1＝(SP-VB)/R1＝(SP-Vref)/R1；
IR2＝(SN-VA)/R2＝(SN-Vref)/R2；
Designing R1-R2-R;
IR3＝IR1-IR2＝(SP-SN)/R；
Vout＝VB-IR3*R3＝Vref-(SP-SN)*R3/R。
when the SP/SN common mode voltage is larger than the voltage at the point A, the current mirrors MN3 and MN4 work, current flows from the SP/SN through R2/R3, the current mirrors MN3 and MN4 are connected to the ground, and the input level of the OPA2 is close to the voltage at the point A.
When the SP/SN common mode voltage is less than the A point voltage, the current mirrors MP3 and MP4 work, the current flows from VCC to the current mirrors MP3 and MP4, flows through R2/R3 to SP/SN, and the OPA2 input level is near the A point voltage.
Therefore, the wide-range input common mode level of the SP/SN is realized, and the input common mode level range from less than the ground to more than the power supply voltage can be realized by adjusting the current capacity of the current mirror and the resistance values of R2 and R3. The larger the current capability of the current mirror, the wider the input common mode voltage range. Assuming that the maximum current capability of the current mirror is Imax, the input common mode voltage range is
VCM＝VA±Imax*R2。
When the current is detected, the common-mode voltage input in an ultra-wide range is realized by using the operational amplifier with a low-voltage domain limited input common-mode range, the high-voltage drop is reduced on the resistor, all operational circuits are realized by low-voltage devices, a high-voltage source is not required to be additionally generated, high-voltage devices are not required to be used, and the required functions can be realized in an ultra-small area.
The above description is only for the purpose of illustrating the present invention and is not intended to limit the scope of the present invention, and any person skilled in the art can substitute or change the technical solution of the present invention and its conception within the scope of the present invention.

Claims (10)

1. A wide input common mode voltage range current sense amplifier circuit characterized in that: the operational amplifier OPA1 is characterized in that the positive electrode of the operational amplifier OPA1 is connected with a reference level, the negative electrode of the operational amplifier OPA1 is electrically connected with the source electrode of the field-effect tube MN1 and the source electrode of the field-effect tube MP1, the negative electrode of the operational amplifier OPA1 is further connected with one end of a resistor R2, the other end of the resistor R2 is externally connected with a terminal SN and is an input detection end, the output end of the operational amplifier OPA1 is electrically connected with the grid electrode of the field-effect tube 737MN 3, the grid electrode of the field-effect tube MP1, the grid electrode of the field-effect tube MP2 and the grid electrode of the field-effect tube MN2, the drain electrode of the field-effect tube MP1 is connected with the drain.
2. The current sense amplifier circuit of claim 1, wherein: the source electrode of the field-effect tube MN3 is also connected with the source electrode of the field-effect tube MN4, the grid electrode of the field-effect tube MN3 is connected with the grid electrode of the field-effect tube MN4, and the drain electrode of the field-effect tube MN3 is connected with the grid electrode of the field-effect tube MN 3.
3. The current sense amplifier circuit of claim 1, wherein: the source electrode of the field effect transistor MN2 is connected with the drain electrode of the field effect transistor MP2, the drain electrode of the field effect transistor MP2 is connected with the drain electrode of the field effect transistor MN4, and the drain electrode of the field effect transistor MP4 is connected with the drain electrode of the field effect transistor MN 2.
4. The current sense amplifier circuit of claim 1, wherein: the grid of the field effect transistor MP4 is connected with the grid of the field effect transistor MP3, the sources of the field effect transistors MP3 and MP4 are connected with each other and with a power supply VCC, the drain of the field effect transistor MP3 is connected with the grid of the field effect transistor MP3, and the source of the field effect transistor MN2 is connected with one end of a resistor R1.
5. The current sense amplifier circuit of claim 1, wherein: the other end of the resistor R1 is connected with an external terminal SP and is an input detection end, one end of the resistor R1 is connected with one end of the resistor R2, one end of the resistor R1 is connected with one end of the resistor R3, and one end of the resistor R3 is also connected with the negative electrode of an operational amplifier OPA 2.
6. The current sense amplifier circuit of claim 1, wherein: the positive pole of the operational amplifier OPA2 is connected with the negative pole of the operational amplifier OPA1, the output end of the operational amplifier OPA2 outputs a voltage signal, and the other end of the resistor R3 is connected with the output end of the operational amplifier OPA 2.
7. The current sense amplifier circuit of claim 1, wherein: VCC is the internal logic low voltage level, MPx is PMOS pipe, MNx is NMOS pipe, Rx is the resistance, OPAx is the operational amplifier.
8. The current sense amplifier circuit of claim 1, wherein: the OPA1, MN1, MP1 on the left is an operational amplifier circuit with classmab output stage, which acts to make the a point level equal to the Vref level.
9. The current sense amplifier circuit of claim 1, wherein: the MP3, MP4 current mirror and MN3, MN4 current mirror will mirror the current in R2 to make it flow through resistor R1.
10. The current sense amplifier circuit of claim 1, wherein: MN2 and MP2 are cascade MOS of current mirrors for improving channel length modulation effect of the current mirror MOS.
CN202010433759.4A 2020-05-21 2020-05-21 Wide input common mode voltage range current detection amplifier circuit Active CN111721986B (en)

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Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117388561A (en) * 2023-12-07 2024-01-12 苏州锴威特半导体股份有限公司 Current detection circuit with wide voltage range and switching power supply

Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754078A (en) * 1995-04-21 1998-05-19 Nec Corporation Operational amplifier for class B amplification
CN101064503A (en) * 2006-04-30 2007-10-31 中芯国际集成电路制造(上海)有限公司 Wide-input common-mode voltage comparators
CN201233548Y (en) * 2008-07-25 2009-05-06 深圳市远望谷信息技术股份有限公司 Voltage-current conversion circuit
CN102331809A (en) * 2011-07-14 2012-01-25 复旦大学 Current mirror circuit with grid leakage compensating function
CN103780212A (en) * 2012-10-25 2014-05-07 华为技术有限公司 Operational amplifiers, level switching circuit and programmable gain amplifier
CN110011627A (en) * 2019-04-26 2019-07-12 苏州大学 A kind of wide input range high cmrr operation transconductance amplifier
US20190302825A1 (en) * 2016-12-02 2019-10-03 Nordic Semiconductor Asa Reference voltage generator
CN110377089A (en) * 2019-07-19 2019-10-25 杭州恒芯微电子科技有限公司 A kind of multi-level differential amplifier output common mode voltage stable circuit simplified
CN209692711U (en) * 2019-04-26 2019-11-26 苏州大学 A kind of wide input range high cmrr operation transconductance amplifier
CN209930214U (en) * 2019-06-10 2020-01-10 上海夷易半导体有限公司 Novel common mode level shift circuit for operational amplifier

Patent Citations (10)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5754078A (en) * 1995-04-21 1998-05-19 Nec Corporation Operational amplifier for class B amplification
CN101064503A (en) * 2006-04-30 2007-10-31 中芯国际集成电路制造(上海)有限公司 Wide-input common-mode voltage comparators
CN201233548Y (en) * 2008-07-25 2009-05-06 深圳市远望谷信息技术股份有限公司 Voltage-current conversion circuit
CN102331809A (en) * 2011-07-14 2012-01-25 复旦大学 Current mirror circuit with grid leakage compensating function
CN103780212A (en) * 2012-10-25 2014-05-07 华为技术有限公司 Operational amplifiers, level switching circuit and programmable gain amplifier
US20190302825A1 (en) * 2016-12-02 2019-10-03 Nordic Semiconductor Asa Reference voltage generator
CN110011627A (en) * 2019-04-26 2019-07-12 苏州大学 A kind of wide input range high cmrr operation transconductance amplifier
CN209692711U (en) * 2019-04-26 2019-11-26 苏州大学 A kind of wide input range high cmrr operation transconductance amplifier
CN209930214U (en) * 2019-06-10 2020-01-10 上海夷易半导体有限公司 Novel common mode level shift circuit for operational amplifier
CN110377089A (en) * 2019-07-19 2019-10-25 杭州恒芯微电子科技有限公司 A kind of multi-level differential amplifier output common mode voltage stable circuit simplified

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN117388561A (en) * 2023-12-07 2024-01-12 苏州锴威特半导体股份有限公司 Current detection circuit with wide voltage range and switching power supply
CN117388561B (en) * 2023-12-07 2024-03-01 苏州锴威特半导体股份有限公司 Current detection circuit with wide voltage range and switching power supply

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