CN116466787A - High-precision band-gap reference circuit with adjustable output voltage - Google Patents
High-precision band-gap reference circuit with adjustable output voltage Download PDFInfo
- Publication number
- CN116466787A CN116466787A CN202310401905.9A CN202310401905A CN116466787A CN 116466787 A CN116466787 A CN 116466787A CN 202310401905 A CN202310401905 A CN 202310401905A CN 116466787 A CN116466787 A CN 116466787A
- Authority
- CN
- China
- Prior art keywords
- temperature coefficient
- output
- current
- output voltage
- trimming module
- Prior art date
- Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
- Granted
Links
- 238000009966 trimming Methods 0.000 claims abstract description 103
- 230000005540 biological transmission Effects 0.000 claims description 50
- 238000000034 method Methods 0.000 claims description 8
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 238000012360 testing method Methods 0.000 abstract description 9
- 230000000694 effects Effects 0.000 abstract description 3
- 238000010998 test method Methods 0.000 abstract description 3
- 230000002401 inhibitory effect Effects 0.000 abstract 1
- 238000005457 optimization Methods 0.000 description 10
- 239000000284 extract Substances 0.000 description 4
- 238000004088 simulation Methods 0.000 description 4
- 238000010586 diagram Methods 0.000 description 3
- 238000000605 extraction Methods 0.000 description 3
- 238000002347 injection Methods 0.000 description 3
- 239000007924 injection Substances 0.000 description 3
- 230000007547 defect Effects 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000001276 controlling effect Effects 0.000 description 1
- 238000012938 design process Methods 0.000 description 1
- 239000012467 final product Substances 0.000 description 1
- 239000000047 product Substances 0.000 description 1
- 230000001105 regulatory effect Effects 0.000 description 1
- 229920006395 saturated elastomer Polymers 0.000 description 1
- 239000007787 solid Substances 0.000 description 1
- 230000009466 transformation Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G05—CONTROLLING; REGULATING
- G05F—SYSTEMS FOR REGULATING ELECTRIC OR MAGNETIC VARIABLES
- G05F1/00—Automatic systems in which deviations of an electric quantity from one or more predetermined values are detected at the output of the system and fed back to a device within the system to restore the detected quantity to its predetermined value or values, i.e. retroactive systems
- G05F1/10—Regulating voltage or current
- G05F1/46—Regulating voltage or current wherein the variable actually regulated by the final control device is dc
- G05F1/56—Regulating voltage or current wherein the variable actually regulated by the final control device is dc using semiconductor devices in series with the load as final control devices
- G05F1/561—Voltage to current converters
-
- 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 discloses a high-precision band gap reference circuit with adjustable output voltage, belonging to the technical field of systems for adjusting electric variables or magnetic variables. The bandgap reference circuit includes: the KUIJK band gap reference taking the operational amplifier as a core device, a first trimming module and a second trimming module, wherein the first trimming module is connected between an operational amplifier inverting input end and an output end, the second trimming module is connected between the operational amplifier output end and a band gap tail resistor, the first trimming module is used for inhibiting input offset voltage to realize approximate first-order compensation, and the second trimming module is used for improving the precision of output reference voltage. The band gap reference circuit further comprises a first-order temperature compensation current generation module for performing first-order temperature compensation on the output reference voltage, the output reference voltage is subjected to rough adjustment and then fine adjustment through the adjustment module, further first-order temperature compensation is performed on the output reference voltage, a two-point test method can be simplified through a single-point adjustment mode in a test stage, a good first-order temperature compensation effect is achieved, and test cost is reduced.
Description
Technical Field
The invention discloses a high-precision band gap reference circuit with adjustable output voltage, belonging to the technical field of systems for adjusting electric variables or magnetic variables.
Background
Bandgap reference circuits are widely used in analog circuitry, digital-to-analog hybrid circuitry, to provide accurate voltage biasing for other circuit blocks within the system. The accuracy of the output reference voltage of the band gap reference circuit is affected by external temperature change, technological parameters, power supply voltage and other factors, and how to improve the output accuracy and the power supply rejection ratio of the band gap reference circuit is a problem to be solved urgently.
The operational amplifier is a core device of the bandgap reference circuit. Because the tubes of the two differential input stages in the operational amplifier are not matched, the output voltage of the operational amplifier is not zero when the operational amplifier is in open loop operation or connected as a follower. In order to make the output voltage zero when the operational amplifier is in open loop operation or connected as a follower, a small voltage which makes the output voltage zero needs to be added at the input end of the operational amplifier, and the small voltage is the input offset voltage. Due to the limitation of the technical level, the mismatch of the tubes of the two differential input stages in the operational amplifier is unavoidable, the increase of the tube area is one possible way to improve the tube matching degree, but the defects of increasing the circuit area and the cost exist, and the tube matching degree is not improved when the tube area is increased to a certain level, so that the test and the trimming of the flow sheet are required. On the other hand, the temperature drift of the input offset voltage is an important factor causing the offset of the output voltage, and how to inhibit the influence of the temperature drift of the input offset voltage on the output precision is also a factor to be considered in the design process of the band gap reference circuit.
In order to adjust the precision of the reference voltage output by the band gap reference circuit in the prior art, the operational amplifier coefficient is adjusted by a mode of matching the trimming module with the operational amplifier, and then the reference voltage is adjusted to reach a target value, but the reference voltage adjusting mode needs to be connected into a first-stage operational amplifier and matched with a buffer stage for adjustment after the operational amplifier, and the circuit area and the power consumption are increased by the first-stage operational amplifier and the introduction of the buffer stage.
The influence of temperature drift on the output precision of the band gap reference circuit is overcome by the temperature compensation technology in the prior art, wherein the first-order temperature compensation technology which can obtain a better compensation effect in a saturated linear region is widely applied. The first-order temperature compensation technology overcomes temperature drift by extracting the same temperature coefficient current or injecting the opposite temperature coefficient current, and the output voltage value corresponding to the temperature coefficient on the temperature characteristic curve can change when the same temperature coefficient current or injecting the opposite temperature coefficient current is extracted, so that the temperature characteristic curve change leads to the two-point test method for testing the final product to need multiple adjustment to determine the temperature compensation coefficient, and the test cost is high.
In summary, the present invention aims to provide a bandgap reference with high precision, strong driving force and adjustable output voltage, so as to overcome the above-mentioned drawbacks.
Disclosure of Invention
The invention aims to overcome the defects of the background technology, and provides a high-precision band-gap reference circuit with adjustable output voltage, which solves the technical problems of the existing band-gap reference circuit that the output precision is improved, the output voltage is adjusted to increase devices such as operational amplifiers and the like, and the invention aims to improve the band-gap reference output precision and adjust the output voltage to be output near a target value by applying an adjustment module.
The invention adopts the following technical scheme for realizing the purposes of the invention:
an output voltage adjustable high precision bandgap reference circuit comprising: the KUIJK band gap reference, the first trimming module and the second trimming module which take the operational amplifier as a core device are connected between the operational amplifier inverting input end and the output end, and the second trimming module is connected between the operational amplifier output end and the band gap tail resistor.
As a further optimization scheme of the high-precision band gap reference circuit with adjustable output voltage, the first trimming module and the second trimming module have the same circuit structure and are formed by connecting at least one resistor branch in parallel, and the resistor branch is formed by connecting a resistor and a switching tube in series.
As a still further optimization scheme of the high-precision band-gap reference circuit with adjustable output voltage, the second trimming module further comprises a voltage dividing branch consisting of series resistors, and the voltage dividing branch is connected with at least one resistor branch in parallel.
As a still further optimization scheme of the high-precision bandgap reference circuit with adjustable output voltage, the bandgap reference circuit further comprises a first-order temperature compensation current generation module, the first-order temperature compensation current generation module comprises: the system comprises a third trimming module, a fourth trimming module and an output module. The first input end of the third trimming module is connected with a first positive temperature coefficient current, the second input end of the third trimming module is connected with a negative temperature coefficient current, the first output end of the third trimming module outputs K times of the negative temperature coefficient current, the second output end of the third trimming module outputs K times of the first positive temperature coefficient current, K is a control code word of the third trimming module, and n is the amplification factor of the first positive temperature coefficient current. The input end of the fourth trimming module is connected with the second positive temperature coefficient current, the fourth trimming module outputs L times of the second positive temperature coefficient current, and L is a control code word of the fourth trimming module. The first input end of the output module is connected with the first output end of the third trimming module, the second input end of the output module is connected with the second output end of the third trimming module and the output end of the fourth trimming module, when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, the first temperature compensation current is obtained by extracting the first positive temperature coefficient current which is K times n times from the injected negative temperature coefficient current and then extracting the second positive temperature coefficient current which is L times from the injected negative temperature coefficient current, and when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient, the first temperature compensation current is obtained by extracting the first positive temperature coefficient current which is L times from the injected first positive temperature coefficient current which is K times n times, and the first temperature compensation current is output to the operational amplifier input end.
As a still further optimization scheme of the high-precision bandgap reference circuit with adjustable output voltage, the third trimming module comprises: the first current mirror, the second current mirror and the third current mirror. The input end of the first current mirror is used as the first input end of the third trimming module to be connected with the first positive temperature coefficient current, and the first current mirror outputs the first positive temperature coefficient current. The input end of the second current mirror is connected with the output end of the first current mirror, the output end of the second current mirror is used as the second output end of the third trimming module to output K times of the first positive temperature coefficient current, and the value of n is determined by the copy proportion of the second current mirror. The input end of the third current mirror is used as the second input end of the third trimming module to be connected with negative temperature coefficient current, and the output end of the third current mirror is used as the first output end of the third trimming module to output K times of negative temperature coefficient current.
As a still further optimization scheme of the high-precision band gap reference circuit with adjustable output voltage, the fourth trimming module is a fourth current mirror, the input end of the fourth current mirror is used as the input end of the fourth trimming module to be connected with the second positive temperature coefficient current, and the output end of the fourth current mirror is used as the output end of the fourth trimming module to output the L times of the second positive temperature coefficient current.
As a still further optimization scheme of the high-precision bandgap reference circuit with adjustable output voltage, the output module comprises: a fifth current mirror, a sixth current mirror, a first transmission gate, a second transmission gate, a third transmission gate, and a fourth transmission gate. The input end of the fifth current mirror is connected with one end of the second transmission gate, and the output end of the fifth current mirror is connected with the output end of the sixth current mirror. One end of the first transmission gate is used as a second input end of the output module, and is opened when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, and closed when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient. The input end of the sixth current mirror is connected with the other end of the first transmission gate, and the output end of the sixth current mirror is connected with the output end of the fifth current mirror. The other end of the second transmission gate is used as a first input end of the output module, and is opened when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, and is closed when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient. One end of the third transmission gate is connected with one end of the first transmission gate, the other end of the third transmission gate is connected with the output end of the fifth current mirror and the output end of the sixth current mirror, and the third transmission gate is closed when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, and is opened when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient. One end of the fourth transmission gate is connected with the other end of the second transmission gate, the other end of the fourth transmission gate is connected with the output end of the fifth current mirror and the output end of the sixth current mirror, the fourth transmission gate is closed when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, and the fourth transmission gate is opened when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient.
As a still further optimization scheme of the high-precision band-gap reference circuit with adjustable output voltage, when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, the first-order temperature compensation current is as follows: i comp1 ＝K(I CTAT -n*I PTAT1 )-L*I PTAT2 Wherein I comp1 For first order temperature compensation current, I CTAT Is a negative temperature coefficient current, I PTAT1 、I PTAT2 Is a first and a second positive temperature coefficient current.
As a still further optimization scheme of the high-precision band-gap reference circuit with adjustable output voltage, when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient, the first-order temperature compensation current is as follows: i comp1 ＝K(n*I PTAT1 -I CTAT )+L*I PTAT2 。
As a still further optimization scheme of the high-precision band-gap reference circuit with adjustable output voltage, the band-gap reference circuit further comprises a high-order temperature compensation current generation module, and the output end of the high-order temperature compensation current generation module is connected with the input end of the operational amplifier.
As a still further optimization scheme of the high-precision band-gap reference circuit with adjustable output voltage, when all branches of the second trimming module are not connected between the output end of the operational amplifier and the band-gap tail resistor, the band-gap reference circuit outputs the minimum value of the reference voltage; when all the branches of the second trimming module are connected between the operational amplifier output end and the band gap tail resistor, the band gap reference circuit outputs the maximum value of the reference voltage.
The invention adopts the technical scheme and has the following beneficial effects:
(1) Compared with the traditional output reference voltage precision adjusting technology for adjusting the operational amplifier coefficient, the band gap reference circuit provided by the invention can simply and efficiently adjust the band gap reference input offset voltage and the output reference voltage precision without accessing additional operational amplifier and buffer stages, reduce the device and chip area and reduce the power consumption.
(2) The band gap reference circuit provided by the invention is used for carrying out coarse adjustment and then fine adjustment on the temperature drift of the output voltage through the third and fourth adjustment modules, the purpose of subtracting the opposite temperature coefficient current from the compensated temperature coefficient current is realized by extracting the negative/positive temperature coefficient current while injecting the positive/negative temperature coefficient current in the coarse adjustment, the accurate compensation of the temperature drift of the output voltage is realized by injecting the compensated temperature coefficient current on the basis of coarse adjustment, the characteristic that the intersection point generated by the positive and negative temperature coefficient current in the high temperature section of the temperature characteristic curve does not change along with the injection extraction amount is utilized, a two-point test method can be simplified in a single-point adjustment mode in the test stage, the better first-order temperature compensation effect is realized, and the test cost is reduced.
Drawings
Fig. 1 is a circuit diagram of a bandgap reference according to an embodiment of the invention.
Fig. 2 (a) and fig. 2 (b) are block diagrams and specific circuit diagrams of a first-order temperature compensation generating circuit according to an embodiment of the present invention.
Fig. 3 is a simulation result of the temperature characteristic curve of the output reference voltage after the first-order temperature compensation and the temperature characteristic curve of the output reference voltage after the first-order temperature compensation in the embodiment of the invention.
Fig. 4 is a simulation result of a temperature characteristic curve of an output reference voltage after second-order temperature compensation in an embodiment of the present invention.
The reference numerals in the figures illustrate: q1 is a first triode, Q2 is a second triode, R1-R7 are first to seventh resistors, rtrim1 is an access resistor of the first trimming module, and M1-M27 are first to twenty-seventh switching tubes.
Detailed Description
The technical scheme of the invention is described in detail below with reference to the accompanying drawings. As shown in fig. 1, this embodiment takes a KUIJK bandgap reference circuit as an example, and an adjustment scheme of the present invention is exemplarily described. The KUIJK bandgap reference circuit includes: the operational amplifier comprises an operational amplifier, a first triode Q1, a second triode Q2, a first resistor R1, a second resistor R2, a third resistor R3, a fourth resistor R4 and a fifth resistor R5, wherein one end of the first resistor R1 is connected with an inverting input end of the operational amplifier, the collector and the base of the first triode Q1 are both connected with the other end of the first resistor R1, the collector and the base of the second triode Q2 are both connected with an in-phase input end of the operational amplifier, the emitter of the first triode Q1 and the emitter of the second triode Q2 are both connected with one end of the second resistor R2, the other end of the second resistor R2 is connected with one end of a second trimming module after being connected with one end of the third resistor R3, the other end of the second trimming module is connected with an output end of the operational amplifier, the other end of the third resistor R3 is grounded, one end of the fourth resistor R4 is connected with the inverting input end of the operational amplifier, the other end of the fourth resistor R4 is connected with one end of an access resistor Rtm 1 of the first trimming module, one end of the other end of the fifth resistor R5 is connected with the other end of the operational amplifier, and the other end of the first trimming module is connected with the other end of the first resistor Rtm 1. The first trimming module and the second trimming module have the same circuit structure and are formed by connecting a plurality of resistor branches in parallel, and each resistor branch is formed by connecting a switch tube and a resistor in series. The second trimming module is also connected in parallel with a voltage dividing branch, and the voltage dividing branch is formed by serially connecting a sixth resistor R6 and a seventh resistor R7.
The band-gap reference circuit branch current I1 is formed by the voltage difference DeltaV of the base emitter electrode and the emitter electrode between the first triode and the second triode BE The voltage drop on the first resistor R1 is determined, the fourth resistor R4 is connected in series with the access resistor Rtrim1 of the first trimming module, and the difference between the two ends of the fourth resistor R4 and the fifth resistor R5 is the same as the difference between the two ends of the fourth resistor R4 and the fifth resistor R5.
If r4=r5, then the bandgap reference circuit has the same two branch currents I1 and I2.
Taking into account the input offset voltage V OS The reference voltage V output by the band-gap reference circuit can be obtained ref ：
Wherein V is T Is thermal voltage, I S1 、I S2 Is the reverse saturation current of PN junction of the first triode and the second triode, V BE1 、V BE2 The voltage is the base emitter voltage of the first triode and the second triode.
To reduce input disorderThe influence of voltage error on band gap precision can enable DeltaV BE The term is larger. The proportion of R4+Rtrim1 to R5 can be adjusted through a trim1 module, so that the proportion of I2 to I1 is improved, input offset voltage errors are reduced, and band gap voltage precision is improved.
Meanwhile, the trim1 module can also adjust the access resistor R trim1 of the first trimming module by adjusting the number of parallel resistor branches, and further adjust the resistance value of R trim1+R4, so that approximate first-order temperature compensation is realized, but the compensation precision is limited, and further first-order temperature compensation can be realized through a first-order compensation current Icomp1 generating circuit shown in fig. 2.
As shown in fig. 2 (a), the first-order compensation current Icomp1 generating circuit includes: the system comprises a third trimming module, a fourth trimming module and an output module.
As shown in fig. 2 (a) and fig. 2 (b), the input end of the third trimming module is connected to a first positive temperature coefficient current IPTAT1 and a negative temperature coefficient current ICTAT, and outputs K times of the negative temperature coefficient current and K times of the first positive temperature coefficient current to the output module, where K is a control codeword of the third trimming module, and n is a current amplification factor. The third trimming module comprises: a first current mirror formed by the first switching tube M1 to the seventh switching tube M7, a second current mirror formed by the eighth switching tube and the ninth switching tube, and a third current mirror formed by the tenth switching tube M10 to the sixteenth switching tube M16. The grid electrode and the drain electrode of the first switching tube M1 are connected with the grid electrode of the third switching tube M3 to serve as input ends of a first current mirror, the input end of the first current mirror serves as a first input end of an output module to be connected with a first positive temperature coefficient current IPTAT1, the drain electrode of the second switching tube M2, the drain electrode of the fourth switching tube M4 and the drain electrode of the sixth switching tube M6 are connected to serve as output ends of the first current mirror, the grid electrode of the second switching tube M2, the grid electrode of the fourth switching tube M4 and the grid electrode of the sixth switching tube M6 are connected, the source electrode of the second switching tube M2 is connected with the drain electrode of the third switching tube M3, the source electrode of the fourth switching tube M4 is connected with the drain electrode of the fifth switching tube M5, the grid electrode of the seventh switching tube M7 is connected with the grid electrode of the third switching tube M3, and the source electrode of the fifth switching tube M5 is connected with the source electrode of the seventh switching tube M7. The grid and the emitter of the eighth switching tube M8 are connected with the grid of the ninth switching tube M9 to serve as the input end of a second current mirror, the input end of the second current mirror is connected with the output end of the first current mirror, the emitter of the ninth switching tube M9 serves as the output end of the second current mirror, and the collector of the eighth switching tube M8 is connected with the collector of the ninth switching tube M9. The grid and the drain of the tenth switch tube M10 are connected with the grid of the twelfth switch tube M12 to be used as the input end of a third current mirror, the input end of the third current mirror is used as the second input end of an output module to be connected with negative temperature coefficient current ICTAT, the drain of the eleventh switch tube M11, the drain of the thirteenth switch tube M13 and the drain of the fifteenth switch tube M15 are connected with the output end of the third current mirror, the grid of the eleventh switch tube M11, the grid of the thirteenth switch tube M13 and the grid of the fifteenth switch tube M15 are connected, the source of the eleventh switch tube M11 is connected with the drain of the twelfth switch tube M12, the source of the thirteenth switch tube M13 is connected with the drain of the fourteenth switch tube M14, the source of the fifteenth switch tube M15 is connected with the drain of the sixteenth switch tube M16, and the grid of the thirteenth switch tube M10, the source of the twelfth switch tube M12, and the source of the sixteenth switch tube M14 and the source of the sixteenth switch tube M16 are all grounded. The input end of the first current mirror is the input end of the third trimming module, the output end of the third current mirror is the first output end of the third trimming module, and the output end of the second current mirror is the second output end of the third trimming module.
The input end of the fourth trimming module is connected with a second positive temperature coefficient current IPTAT2, L times of the second positive temperature coefficient current is output, and L is a control code word of the fourth trimming module. The fourth trimming module is a fourth current mirror formed by twenty-first switching tubes M21 to twenty-seventh switching tubes M27. The grid and the emitter of the twenty-first switching tube M21 are connected with the grid of the twenty-second switching tube M22, the grid of the twenty-fourth switching tube M24 and the grid of the twenty-sixth switching tube M26 to be used as input ends of a fourth current mirror, the emitter of the twenty-third switching tube M23, the emitter of the twenty-fifth switching tube M25 and the emitter of the twenty-seventh switching tube M27 are connected with each other to be used as output ends of the fourth current mirror, the collector of the twenty-first switching tube M21, the collector of the twenty-second switching tube M22, the collector of the twenty-fourth switching tube M24 and the collector of the twenty-sixth switching tube M26 are connected, the emitter of the twenty-second switching tube M22 is connected with the collector of the twenty-third switching tube M23, the emitter of the twenty-fourth switching tube M24 is connected with the collector of the twenty-fifth switching tube M25, and the emitter of the twenty-sixth switching tube M26 is connected with the collector of the twenty-seventh switching tube M27. The output end of the third current mirror is connected with the output end of the fourth current mirror.
The first input end of the output module is connected with the first output end of the third trimming module, and the second input end of the output module is connected with the output end of the fourth trimming module and the second output end of the third trimming module. The output module includes: a fifth current mirror formed by a seventeenth switching tube M17 and an eighteenth switching tube M18, a sixth current mirror formed by a nineteenth switching tube M19 and a twentieth switching tube, a first transmission gate TG1, a second transmission gate TG2, a third transmission gate TG3 and a fourth transmission gate TG4. The grid and the drain electrode of the seventeenth switching tube M17 are connected with the grid electrode of the eighteenth switching tube M18 to serve as the input end of a fifth current mirror, the drain electrode of the eighteenth switching tube M18 serves as the output end of the fifth current mirror, the source electrode of the seventeenth switching tube M17 is connected with the source electrode of the eighteenth switching tube M18, the input end of the fifth current mirror is connected with one end of a second transmission gate TG2, and the other end of the second transmission gate TG2 serves as the first input end of an output module. The grid electrode and the drain electrode of the nineteenth switching tube M19 are connected with the grid electrode of the twentieth switching tube M20 to serve as the input end of a sixth current mirror, the drain electrode of the twentieth switching tube M20 serves as the output end of the sixth current mirror, the source electrode of the nineteenth switching tube M19 and the source electrode of the twentieth switching tube M20 are grounded, and the output end of the sixth current mirror is connected with the output end of the fifth current mirror. One end of the first transmission gate TG1 is used as a second input end of the output module, the other end of the first transmission gate TG1 is connected with the input end of the sixth current mirror, the third transmission gate TG3 is connected between one end of the first transmission gate TG1 and the output end of the fifth current mirror, and the fourth transmission gate TG4 is connected between the other end of the second transmission gate TG2 and the output end of the fifth current mirror. When the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, the first transmission gate TG1 and the second transmission gate TG2 are opened, the third transmission gate TG3 and the fourth transmission gate TG4 are closed, and the output module extracts K times of first positive temperature coefficient current from the injected K times of negative temperature coefficient current and then extracts L times of second positive temperature coefficient current to obtain first-order temperature compensation current; when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient, the first transmission gate TG1 and the second transmission gate TG2 are closed, the third transmission gate TG3 and the fourth transmission gate TG4 are opened, the output module extracts K times of negative temperature coefficient current from the injected K times of positive temperature coefficient current, then injects L times of second positive temperature coefficient current to obtain first-order temperature compensation current, and outputs the first-order temperature compensation current to the access end of the second trimming module.
Further compensation of the first order temperature by the first order compensation current Icomp1 includes two phases, coarse and fine. The coarse adjustment stage can comprise two modes, and the mode for coarse adjustment is determined by testing two output voltage points and the temperature coefficient thereof; when the output voltage value corresponding to the low temperature coefficient is lower than the output voltage value corresponding to the high temperature coefficient, the band gap reference circuit outputs positive temperature coefficient voltage, and a first coarse tuning mode is selected, namely negative temperature coefficient current ICTAT is injected and first positive temperature coefficient current IPTAT1 is extracted; when the output voltage value corresponding to the low temperature coefficient is higher than the output voltage value corresponding to the Gao Wendu coefficient, the band gap reference circuit outputs the negative temperature coefficient voltage, and a second coarse tuning mode is selected, namely the first positive temperature coefficient current IPTAT1 is injected and the negative temperature coefficient current ICTAT is extracted. Injecting or extracting positive temperature coefficient current IPTAT1 and injecting or extracting negative temperature coefficient current ICTAT are realized through a third trimming module. The third trimming module is controlled by a control code word K, and the first-order compensation current after coarse adjustment is output is obtained by a certain proportion K.
Meanwhile, after the output reference voltage is regulated through the first coarse regulation mode, a second positive temperature coefficient current IPTAT2 is extracted through a fourth regulation module; after the output reference voltage is adjusted in the second coarse adjustment mode, a second positive temperature coefficient current IPTAT2 is injected through a fourth trimming module.
The first-order compensation current Icomp1 obtained by fine tuning the compensation current obtained by the first coarse tuning mode is:
I comp1 ＝K(I CTAT -n*I PTAT1 )-L*I PTAT2
the first-order compensation current Icomp1 obtained by fine tuning the compensation current obtained by the second coarse tuning mode is:
I comp1 ＝K(n*I PTAT1 -I CTAT )+L*I PTAT2
the K, L is controlled by the code words of the third trimming module and the fourth trimming module, and the n is controlled by the copy proportion of the current mirror in the third trimming module. After determining K, adjustments for different process angle variations can be achieved by a single change in L. Therefore, the third trimming module and the fourth trimming module can cope with the transformation of the process angle so as to realize fine first-order temperature compensation under the condition of different voltage process angles.
The simulation results of the first-order pre-compensation output reference voltage temperature characteristic curve and the first-order post-compensation output reference voltage temperature characteristic curve are shown in fig. 3, the dashed curve and the dotted curve represent the post-compensation output reference voltage temperature characteristic curves obtained under different injection extraction amounts, the solid curve represents the pre-compensation output reference voltage temperature characteristic curve, along with the increase of the third trimming module control codeword trimming bit number, the first-order post-compensation reference voltage temperature characteristic curves are intersected with the first-order pre-compensation output reference voltage temperature characteristic curve at the T0 position, and the voltage value at the intersection point is almost unchanged. The simulation table shown in fig. 3 shows that the first-order temperature compensation technology extracts positive/negative temperature coefficient current while injecting negative/positive temperature coefficient current, so that the intersection point exists between the positive temperature coefficient output voltage curve and the negative temperature coefficient output voltage curve at high temperature, and the intersection point is basically unchanged along with the change of injection extraction amount, thereby greatly simplifying the repairing and adjusting flow of the products returned by the flow sheet and reducing the test cost.
On the basis of the first-order temperature compensation, the curvature compensation of the high-low temperature section is realized by injecting a high-order temperature compensation current Icomp 2. The high-order temperature compensation current can be generated by including but not limited to a high-low temperature square term index compensation mode and a segmented high-low temperature linear compensation mode, and is not repeated in the application.
After high-order temperature compensation is carried out on the operational amplifier output reference voltage, the PPM value is relatively smaller, the operational amplifier output reference voltage can be adjusted to a required voltage value by adopting the second trimming module, namely, the precision compensation current Icomp3 with different amplitude values is injected into the operational amplifier input end by controlling the equivalent resistance of the second trimming module, so that the output reference voltage at the moment is lifted. And the lifting precision of the output reference voltage of the band gap reference circuit is controlled by adding the trimming bit number of the second trimming module control code word. Under the condition that all the trim2 modules are not connected, the minimum value of the output reference voltage is V1, and the minimum value V1 of the output reference voltage is determined by the total resistance value of R6 and R7; when all the trim2 modules are connected, the parallel resistance is the smallest and the current of each branch is the largest, so that the output reference voltage is the maximum value V2 at the moment, and the adjustment ranges V1-V2 of the output reference voltage can be obtained. And injecting extra current into the input end of the operational amplifier through the low temperature coefficient resistor connected in parallel in the second trimming module so as to achieve the purposes of improving the precision of the output reference voltage under the condition of keeping the PPM value almost unchanged.
The temperature characteristic curve of the output reference voltage of the band gap reference circuit provided by the invention can be obtained by simulating the output reference voltage subjected to second-order temperature compensation, the temperature characteristic curve of the final output reference voltage of the band gap reference circuit provided by the invention fluctuates within a reasonable range, for example, the expected value of the output reference voltage changes within a range of 1mv at 25 ℃, if the target value of the output reference voltage is 4.096V, and the final trimming output reference voltage can be output within a range of 4.095V-4.097V.
The above embodiments are merely illustrative of the present invention and do not limit the scope thereof, and those skilled in the art may change the parts thereof, and any equivalent thereof in any form consistent with the gist of the present invention falls within the scope of the present invention.
Claims (10)
1. An output voltage adjustable high precision bandgap reference circuit, comprising: the KUIJK band gap reference taking the operational amplifier as a core device, a first trimming module and a second trimming module, wherein the first trimming module is connected between the operational amplifier inverting input end and the output end, and the second trimming module is connected between the operational amplifier output end and the band gap tail resistor.
2. The high-precision band gap reference circuit with adjustable output voltage according to claim 1, wherein the first trimming module and the second trimming module have the same circuit structure and are formed by connecting at least one resistor branch in parallel, and the resistor branch is formed by connecting a resistor and a switch tube in series.
3. The high-precision bandgap reference circuit of claim 2, wherein said second trimming module further comprises a voltage dividing branch consisting of series resistors, said voltage dividing branch being connected in parallel with at least one resistor branch.
4. The output voltage tunable high precision bandgap reference circuit of claim 1, wherein said bandgap reference circuit further comprises a first order temperature compensation current generation module, said first order temperature compensation current generation module comprising:
the first input end of the third trimming module is connected with a first positive temperature coefficient current, the second input end of the third trimming module is connected with a negative temperature coefficient current, the first output end of the third trimming module outputs K times of the negative temperature coefficient current, the second output end of the third trimming module outputs K times of the first positive temperature coefficient current, K is a control code word of the third trimming module, and n is the amplification factor of the first positive temperature coefficient current;
the input end of the fourth trimming module is connected with the second positive temperature coefficient current, and outputs L times of the second positive temperature coefficient current, wherein L is a control code word of the fourth trimming module; the method comprises the steps of,
and when the output voltage value corresponding to the low temperature coefficient is greater than the output voltage value corresponding to the high temperature coefficient, extracting K times of second positive temperature coefficient current from the injected K times of negative temperature coefficient current to obtain first-order temperature compensation current, and when the output voltage value corresponding to the low temperature coefficient is greater than the output voltage value corresponding to the high temperature coefficient, extracting K times of second positive temperature coefficient current from the injected K times of first positive temperature coefficient current to obtain first-order temperature compensation current, and then injecting L times of second positive temperature coefficient current to obtain first-order temperature compensation current.
5. The high-precision bandgap reference circuit of claim 4, wherein said third trimming module comprises:
the input end of the first current mirror is used as a first input end of the third trimming module to be connected with a first positive temperature coefficient current, and the first positive temperature coefficient current is output;
the input end of the second current mirror is connected with the output end of the first current mirror, the output end of the second current mirror is used as the second output end of the third trimming module to output K times of the first positive temperature coefficient current, and the value of n is determined by the copy proportion of the second current mirror; the method comprises the steps of,
and the input end of the third current mirror is used as the second input end of the third trimming module to be connected with negative temperature coefficient current, and the output end of the third current mirror is used as the first output end of the third trimming module to output K times of negative temperature coefficient current.
6. The high-precision band gap reference circuit with adjustable output voltage according to claim 5, wherein the fourth trimming module is a fourth current mirror, the input end of the fourth current mirror is used as the input end of the fourth trimming module to be connected with the second positive temperature coefficient current, and the output end of the fourth current mirror is used as the output end of the fourth trimming module to output the second positive temperature coefficient current which is L times as large as the output end of the fourth trimming module.
7. The output voltage tunable high precision bandgap reference circuit of claim 6, wherein said output module comprises:
the input end of the fifth current mirror is connected with one end of the second transmission gate, and the output end of the fifth current mirror is connected with the output end of the sixth current mirror;
one end of the first transmission gate is used as a second input end of the output module, and is opened when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, and is closed when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient;
the input end of the sixth current mirror is connected with the other end of the first transmission gate, and the output end of the sixth current mirror is connected with the output end of the fifth current mirror;
the other end of the second transmission gate is used as a first input end of the output module, and is opened when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, and is closed when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient;
one end of the third transmission gate is connected with one end of the first transmission gate, the other end of the third transmission gate is connected with the output end of the fifth current mirror and the output end of the sixth current mirror, and the third transmission gate is closed when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient and is opened when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient; the method comprises the steps of,
and one end of the fourth transmission gate is connected with the other end of the second transmission gate, the other end of the fourth transmission gate is connected with the output end of the fifth current mirror and the output end of the sixth current mirror, the fourth transmission gate is closed when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, and the fourth transmission gate is opened when the output voltage value corresponding to the low temperature coefficient is larger than the output voltage value corresponding to the high temperature coefficient.
8. The high-precision bandgap reference circuit with adjustable output voltage as claimed in claim 7, wherein when the output voltage value corresponding to the low temperature coefficient is smaller than the output voltage value corresponding to the high temperature coefficient, the first-order temperature compensation current is: i comp1 ＝K(I CTAT -n*I PTAT1 )-L*I PTAT2 The method comprises the steps of carrying out a first treatment on the surface of the Said at low temperatureWhen the output voltage value corresponding to the coefficient is larger than the output voltage value corresponding to the high temperature coefficient, the first-order temperature compensation current is as follows: i comp1 ＝K(n*I PTAT1 -I CTAT )+L*I PTAT2 The method comprises the steps of carrying out a first treatment on the surface of the Wherein I is comp1 For first order temperature compensation current, I CTAT Is a negative temperature coefficient current, I PTAT1 、I PTAT2 Is a first and a second positive temperature coefficient current.
9. The high-precision bandgap reference circuit with adjustable output voltage according to claim 6, further comprising a high-order temperature compensation current generation module, wherein an output end of the high-order temperature compensation current generation module is connected with an operational amplifier input end.
10. A high-precision band-gap reference circuit with adjustable output voltage according to claim 3, wherein the band-gap reference circuit outputs a minimum reference voltage when all the branches of the second trimming module are not connected between the operational amplifier output end and the band-gap tail resistor; and when all the branches of the second trimming module are connected between the operational amplifier output end and the band gap tail resistor, the band gap reference circuit outputs a reference voltage maximum value.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310401905.9A CN116466787B (en) | 2023-04-14 | 2023-04-14 | High-precision band-gap reference circuit with adjustable output voltage |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310401905.9A CN116466787B (en) | 2023-04-14 | 2023-04-14 | High-precision band-gap reference circuit with adjustable output voltage |
Publications (2)
| Publication Number | Publication Date |
|---|---|
| CN116466787A true CN116466787A (en) | 2023-07-21 |
| CN116466787B CN116466787B (en) | 2023-12-12 |
Family
ID=87176565
Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310401905.9A Active CN116466787B (en) | 2023-04-14 | 2023-04-14 | High-precision band-gap reference circuit with adjustable output voltage |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116466787B (en) |
Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040245977A1 (en) * | 2003-06-09 | 2004-12-09 | Tran Hieu Van | Curved fractional cmos bandgap reference |
| US20070296392A1 (en) * | 2006-06-23 | 2007-12-27 | Mediatek Inc. | Bandgap reference circuits |
| US20080116875A1 (en) * | 2006-11-16 | 2008-05-22 | Fan Yung Ma | Systems, apparatus and methods relating to bandgap circuits |
| CN102141818A (en) * | 2011-02-18 | 2011-08-03 | 电子科技大学 | Self-adaptive temperature bandgap reference circuit |
| US20110193544A1 (en) * | 2010-02-11 | 2011-08-11 | Iacob Radu H | Circuits and methods of producing a reference current or voltage |
| US20140015504A1 (en) * | 2011-04-12 | 2014-01-16 | Renesas Electronics Corporation | Voltage generating circuit |
| CN104503528A (en) * | 2014-12-24 | 2015-04-08 | 电子科技大学 | Low-noise band-gap reference circuit reducing detuning influence |
| CN108170197A (en) * | 2017-12-19 | 2018-06-15 | 重庆湃芯微电子有限公司 | A kind of high-precision high-order compensation band gap reference circuit |
| DE102020214185A1 (en) * | 2019-12-12 | 2021-06-17 | Robert Bosch Gesellschaft mit beschränkter Haftung | Temperature compensated band gap reference circuit |
| CN113885643A (en) * | 2021-10-28 | 2022-01-04 | 中国电子科技集团公司第二十四研究所 | Trimming circuit and trimming method for reference voltage |
| CN114237339A (en) * | 2021-12-01 | 2022-03-25 | 重庆吉芯科技有限公司 | Band-gap reference voltage circuit and compensation method of band-gap reference voltage |
| CN114326910A (en) * | 2021-12-30 | 2022-04-12 | 西安电子科技大学 | Band-gap reference voltage generating circuit |
| CN115562431A (en) * | 2022-10-17 | 2023-01-03 | 上海赛鹰微电子有限公司 | Band gap reference circuit |
| CN115756053A (en) * | 2022-11-18 | 2023-03-07 | 重庆吉芯科技有限公司 | Band gap reference circuit |
-
2023
- 2023-04-14 CN CN202310401905.9A patent/CN116466787B/en active Active
Patent Citations (14)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| US20040245977A1 (en) * | 2003-06-09 | 2004-12-09 | Tran Hieu Van | Curved fractional cmos bandgap reference |
| US20070296392A1 (en) * | 2006-06-23 | 2007-12-27 | Mediatek Inc. | Bandgap reference circuits |
| US20080116875A1 (en) * | 2006-11-16 | 2008-05-22 | Fan Yung Ma | Systems, apparatus and methods relating to bandgap circuits |
| US20110193544A1 (en) * | 2010-02-11 | 2011-08-11 | Iacob Radu H | Circuits and methods of producing a reference current or voltage |
| CN102141818A (en) * | 2011-02-18 | 2011-08-03 | 电子科技大学 | Self-adaptive temperature bandgap reference circuit |
| US20140015504A1 (en) * | 2011-04-12 | 2014-01-16 | Renesas Electronics Corporation | Voltage generating circuit |
| CN104503528A (en) * | 2014-12-24 | 2015-04-08 | 电子科技大学 | Low-noise band-gap reference circuit reducing detuning influence |
| CN108170197A (en) * | 2017-12-19 | 2018-06-15 | 重庆湃芯微电子有限公司 | A kind of high-precision high-order compensation band gap reference circuit |
| DE102020214185A1 (en) * | 2019-12-12 | 2021-06-17 | Robert Bosch Gesellschaft mit beschränkter Haftung | Temperature compensated band gap reference circuit |
| CN113885643A (en) * | 2021-10-28 | 2022-01-04 | 中国电子科技集团公司第二十四研究所 | Trimming circuit and trimming method for reference voltage |
| CN114237339A (en) * | 2021-12-01 | 2022-03-25 | 重庆吉芯科技有限公司 | Band-gap reference voltage circuit and compensation method of band-gap reference voltage |
| CN114326910A (en) * | 2021-12-30 | 2022-04-12 | 西安电子科技大学 | Band-gap reference voltage generating circuit |
| CN115562431A (en) * | 2022-10-17 | 2023-01-03 | 上海赛鹰微电子有限公司 | Band gap reference circuit |
| CN115756053A (en) * | 2022-11-18 | 2023-03-07 | 重庆吉芯科技有限公司 | Band gap reference circuit |
Also Published As
| Publication number | Publication date |
|---|---|
| CN116466787B (en) | 2023-12-12 |
Similar Documents
| Publication | Publication Date | Title |
|---|---|---|
| CN102393786B (en) | High-order temperature compensation CMOS band-gap reference voltage source | |
| CN106708150A (en) | Sectional multi-order compensation high-precision voltage and current reference circuit | |
| CN113721694B (en) | Self-compensating band gap reference source structure based on curvature function and application thereof | |
| CN109343639A (en) | A kind of Low Drift Temperature band-gap reference voltage circuit, method and its chip | |
| CN113220063B (en) | Band gap reference voltage source with low temperature drift and high precision | |
| CN102012715A (en) | Band-gap reference voltage source compensated by using high-order curvature | |
| CN106873704B (en) | Reference voltage source and its positive temperature coefficient voltage generation circuit | |
| CN110568893B (en) | Ultra-high precision band gap reference source circuit | |
| CN104007777A (en) | Current source generator | |
| CN103901937B (en) | Bandgap voltage reference | |
| CN113703511B (en) | Band-gap reference voltage source with ultralow temperature drift | |
| CN103389772A (en) | Band-gap reference voltage source with adjustable output voltage | |
| CN116466787B (en) | High-precision band-gap reference circuit with adjustable output voltage | |
| CN115437442A (en) | High-order compensation band gap voltage reference circuit | |
| CN109375697B (en) | Temperature drift trimming circuit | |
| Peng et al. | Design of low-power bandgap voltage reference for IoT RFID communication | |
| CN115857608B (en) | Band-gap reference source for realizing high-order temperature compensation in wide range by using depletion tube | |
| CN107992158A (en) | A kind of reference current source of second compensation Low Drift Temperature | |
| CN115903990A (en) | Band-gap reference circuit for reducing temperature drift coefficient by using segmented compensation technology | |
| CN102023670B (en) | Reference current generation circuit | |
| CN220526232U (en) | Band-gap reference voltage source controlled by digital signal of current mirror structure | |
| CN112130610A (en) | High power supply rejection ratio band gap reference circuit | |
| CN205507602U (en) | Reduce reference circuit of offset voltage influence | |
| CN117277781B (en) | Soft start circuit and method for providing high-precision low-overshoot soft start output voltage | |
| CN210924312U (en) | Voltage reference generation circuit |
Legal Events
| Date | Code | Title | Description |
|---|---|---|---|
| PB01 | Publication | ||
| PB01 | Publication | ||
| SE01 | Entry into force of request for substantive examination | ||
| SE01 | Entry into force of request for substantive examination | ||
| GR01 | Patent grant | ||
| GR01 | Patent grant |