CN116225124A - CMOS reference voltage source with high stability and low temperature drift - Google Patents
CMOS reference voltage source with high stability and low temperature drift Download PDFInfo
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- CN116225124A CN116225124A CN202310144081.1A CN202310144081A CN116225124A CN 116225124 A CN116225124 A CN 116225124A CN 202310144081 A CN202310144081 A CN 202310144081A CN 116225124 A CN116225124 A CN 116225124A
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- 238000006243 chemical reaction Methods 0.000 claims abstract description 29
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- 230000001105 regulatory effect Effects 0.000 claims description 3
- 230000007547 defect Effects 0.000 abstract description 7
- 238000005303 weighing Methods 0.000 description 4
- 230000009286 beneficial effect Effects 0.000 description 3
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- 230000006870 function Effects 0.000 description 3
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- 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
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Abstract
The invention provides a CMOS reference voltage source with high stability and low temperature drift, and relates to the technical field of electronics. The CMOS reference circuit voltage source comprises a main control module, an input adjustment module and a reference voltage source module, wherein the main control module is connected with the input adjustment module and the temperature compensation module, the input adjustment module is connected with the reference voltage source module, the main control module comprises a control unit, a storage unit and a starting unit, the storage unit and the starting unit are electrically connected with the control unit, the starting unit is electrically connected with the reference voltage source module, the input adjustment module comprises a voltage stabilizing conversion unit, an analog-to-digital conversion unit and an operation conversion unit, the analog-to-digital conversion unit comprises a first filtering unit, and the voltage stabilizing conversion unit, the analog-to-digital conversion unit and the operation conversion unit are electrically connected. Through modularization processing, the defect that the high temperature drift of the voltage source reference circuit in the prior art affects the circuit performance is overcome, and low temperature drift or zero temperature drift is realized.
Description
Technical Field
The invention relates to the technical field of electronics, in particular to a CMOS reference voltage source with high stability and low temperature drift.
Background
The reference voltage source is used as a basic module unit applied to analog circuit design, mixed signal circuit design and digital design, and is an indispensable circuit unit in bias circuits, A/D, D/A conversion circuits and voltage regulation circuits. The most important characteristic of the reference voltage source is that the output voltage is insensitive to the change of temperature and power supply voltage, the two parameters of temperature coefficient (TC, temperatureCoefficient) and power supply rejection ratio (PSRR, powerSupplyRejectionRatio) determine the performance of the reference voltage source, the hybrid integrated circuit is widely applied to portable devices (such as smart phones, portable computers and tablet computers) and needs to work at a threshold voltage just exceeding that of an MOS tube, and a core design part is that the reference voltage can work under the condition of low voltage of 1V and has strong anti-interference performance on the change of the supply voltage. High accuracy, high power supply rejection ratio, low temperature coefficient reference voltage sources are particularly important for improving chip performance.
The prior art patent (publication number CN 105487592B) discloses a CMOS reference voltage source circuit and integrated circuit device. The technology has the beneficial effects of multiple functions, strong anti-interference capability and wide application range, but has the problem that low-temperature drift or zero-temperature drift cannot be realized, so that high-temperature drift of the voltage source reference circuit is caused, and the circuit performance defect is influenced. Accordingly, one skilled in the art provides a CMOS reference voltage source with high stability and low temperature drift to solve the above-mentioned problems in the background art.
Disclosure of Invention
(one) solving the technical problems
Aiming at the defects of the prior art, the invention provides a CMOS reference voltage source with high stability and low temperature drift, which can realize low temperature drift or zero temperature drift and solve the problem that the high temperature drift of a reference circuit of the voltage source influences the performance defect of the circuit in the prior art.
(II) technical scheme
In order to achieve the above purpose, the invention is realized by the following technical scheme: the CMOS reference voltage source with the high stability and the low temperature drift comprises a main control module, an input adjustment module and a reference voltage source module, wherein the main control module is connected with the input adjustment module and the temperature compensation module, the input adjustment module is connected with the reference voltage source module, the main control module comprises a control unit, a storage unit and a starting unit, the storage unit and the starting unit are electrically connected with the control unit, and the starting unit is electrically connected with the reference voltage source module;
the input adjustment module comprises a voltage stabilizing conversion unit, an analog-to-digital conversion unit and an operation conversion unit, wherein the analog-to-digital conversion unit comprises a first filtering unit, and the voltage stabilizing conversion unit, the analog-to-digital conversion unit and the operation conversion unit are electrically connected;
the reference voltage source module comprises a reference voltage stabilizing unit, a second filtering unit and a feedback unit, wherein the reference voltage stabilizing unit, the second filtering unit and the feedback unit are electrically connected;
the temperature compensation module comprises a sensor unit and a voltage dividing unit, and the sensor unit is electrically connected with the voltage dividing unit;
through the technical scheme, the defect that the high temperature of the reference circuit of the voltage source floats to influence the circuit performance in the prior art is overcome through modularized treatment, low temperature drift or zero temperature drift is realized, meanwhile, the influence of power supply voltage disturbance on the output signal of the voltage reference source is reduced, the power supply stability of the reference source is improved, and high power supply rejection ratio performance is realized.
Preferably, the main control module provides starting support for the whole voltage source reference circuit, the input adjustment module is used for outputting stable voltage and converting analog signals into digital signals to be output, the reference voltage source module provides reference voltage for the whole voltage source reference circuit, the temperature compensation module is used for measuring the temperature of the whole voltage source reference circuit, and the output digital signals are transmitted to the main control module.
Preferably, the starting unit comprises a resistor, one end of the resistor is connected with a ground end, the other end of the resistor is connected with a port of the control unit, and the storage unit adopts FM25L256;
through the technical scheme, when the port value is 0, the starting mode is selected to be the user flash memory mode, so that data is not lost under the condition of no power up, the method has the advantages of low energy consumption, high performance and wide working range of the storage unit.
Preferably, the gain of the operational amplifier unit is adjusted to adjust the power supply rejection performance produced by the reference circuit.
Preferably, the analog-to-digital unit adopts an LTC2415 analog-to-digital converter;
through the technical scheme, the gain error pin is arranged. The noise is low, and the weighing system is suitable for high-precision weighing systems.
Preferably, the main function of the first filtering unit and the second filtering unit is to filter the ac circuit existing in the circuit, so that the dc current is smoother and more stable.
Preferably, the feedback unit is configured to feedback the regulated voltage to the reference circuit such that the current mirror of the reference circuit is identical to the current in the tube.
Preferably, the sensor unit adopts a digital temperature sensor, and the voltage dividing unit is used for dividing voltage when the power supply end is abnormal in power supply.
Working principle: the CMOS reference circuit voltage source provides starting support for the whole voltage source reference circuit through the main control module, the input adjusting module is used for outputting stable voltage, the gain of the operational amplifier unit is adjusted to adjust the power supply inhibition performance generated by the reference circuit, meanwhile analog signals are converted into digital signals to be output, the reference voltage source module provides reference voltage for the whole voltage source reference circuit, alternating current circuits existing in the circuit are filtered through the first filtering unit and the second filtering unit, the reference circuit voltage is fed back through the feedback unit, the current mirror of the reference circuit is enabled to be identical with current in a tube through the voltage adjustment, direct current is enabled to be smoother and more stable, the temperature compensation module is used for measuring the temperature of the whole voltage source reference circuit, and output digital signals are transmitted to the main control module.
(III) beneficial effects
The invention provides a CMOS reference voltage source with high stability and low temperature drift. The beneficial effects are as follows:
the invention provides a CMOS reference voltage source with high stability and low temperature drift, which solves the defects of high temperature drift and influence on circuit performance of a voltage source reference circuit in the prior art through modularized treatment, realizes low temperature drift or zero temperature drift, reduces the influence of power supply voltage disturbance on output signals of the voltage reference source, improves the power supply stability of the reference source, and realizes high power supply rejection ratio performance.
Drawings
FIG. 1 is a schematic diagram of the composition structure of the present invention;
FIG. 2 is a schematic diagram of the structure of an input adjustment module according to the present invention;
FIG. 3 is a schematic diagram of the reference voltage source module according to the present invention.
Detailed Description
The following description of the embodiments of the present invention will be made clearly and completely with reference to the accompanying drawings, in which it is apparent that the embodiments described are only some embodiments of the present invention, but not all embodiments. 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.
As shown in fig. 1-3, an embodiment of the present invention provides a CMOS reference voltage source with high stability and low temperature drift, including a main control module, an input adjustment module, and a reference voltage source module, where the main control module is connected to the input adjustment module and the temperature compensation module, the input adjustment module is connected to the reference voltage source module, the main control module includes a control unit, a storage unit, and a starting unit, the storage unit and the starting unit are all electrically connected to the control unit, the starting unit is electrically connected to the reference voltage source module, the input adjustment module includes a voltage stabilizing conversion unit, an analog-to-digital conversion unit, and an operation conversion unit, the analog-to-digital conversion unit includes a first filter unit, the voltage stabilizing conversion unit, the analog-to-digital conversion unit, and the operation conversion unit are electrically connected, the reference voltage source module includes a reference voltage stabilizing unit, a second filter unit, and a feedback unit, the temperature compensation module includes a sensor unit and a voltage dividing unit, and the sensor unit are electrically connected to the voltage dividing unit;
through modularization processing, the defects that the high temperature of the voltage source reference circuit floats and the circuit performance is influenced in the prior art are overcome, low temperature drift or zero temperature drift is realized, meanwhile, the influence of power supply voltage disturbance on the output signal of the voltage reference source is reduced, the power supply stability of the reference source is improved, and high power supply rejection ratio performance is realized.
The main control module provides starting support for the whole voltage source reference circuit, the input adjustment module is used for outputting stable voltage, analog signals are converted into digital signals to be output, the reference voltage source module provides reference voltage for the whole voltage source reference circuit, the temperature compensation module is used for measuring the temperature of the whole voltage source reference circuit, the output digital signals are transmitted to the main control module, the starting unit comprises a resistor, one end of the resistor is connected with a ground end, the other end of the resistor is connected with a port of the control unit, the storage unit adopts FM25L256, when the port value is 0, the starting mode is selected as a user flash memory mode, data are not lost under the condition of no power-on, the storage unit has the advantages of low energy consumption, high performance and wide working range, the gain of the operational amplifier unit is adjusted to adjust the power supply inhibition performance generated by the reference circuit, and the analog-digital unit adopts an LTC2415 analog-digital converter and has gain error pins. The weighing system has the characteristics of low noise, is suitable for being used as a high-precision weighing system, has the main functions of filtering an alternating current circuit existing in a circuit, enabling direct current to be smoother and more stable, and is characterized in that a feedback unit is used for feeding back a regulating voltage through a reference circuit so that a current mirror of the reference circuit is identical to current in a pair of tubes, a sensor unit adopts a digital temperature sensor, and a voltage dividing unit is used for dividing voltage when power supply of a power supply end is abnormal.
Although embodiments of the present invention have been shown and described, it will be understood by those skilled in the art that various changes, modifications, substitutions and alterations can be made therein without departing from the principles and spirit of the invention, the scope of which is defined in the appended claims and their equivalents.
Claims (8)
1. The utility model provides a CMOS reference voltage source with high stability low temperature floats, includes main control module, input adjustment module and reference voltage source module, its characterized in that: the main control module is connected with the input adjustment module and the temperature compensation module, the input adjustment module is connected with the reference voltage source module, the main control module comprises a control unit, a storage unit and a starting unit, the storage unit and the starting unit are electrically connected with the control unit, and the starting unit is electrically connected with the reference voltage source module;
the input adjustment module comprises a voltage stabilizing conversion unit, an analog-to-digital conversion unit and an operation conversion unit, wherein the analog-to-digital conversion unit comprises a first filtering unit, and the voltage stabilizing conversion unit, the analog-to-digital conversion unit and the operation conversion unit are electrically connected;
the reference voltage source module comprises a reference voltage stabilizing unit, a second filtering unit and a feedback unit, wherein the reference voltage stabilizing unit, the second filtering unit and the feedback unit are electrically connected;
the temperature compensation module comprises a sensor unit and a voltage dividing unit, and the sensor unit is electrically connected with the voltage dividing unit.
2. A CMOS reference voltage source with high stability and low temperature drift as defined in claim 1, wherein: the main control module provides starting support for the whole voltage source reference circuit, the input adjustment module is used for outputting stable voltage and converting analog signals into digital signals to be output, the reference voltage source module provides reference voltage for the whole voltage source reference circuit, the temperature compensation module is used for measuring the temperature of the whole voltage source reference circuit, and the output digital signals are transmitted to the main control module.
3. A CMOS reference voltage source with high stability and low temperature drift as defined in claim 1, wherein: the starting unit comprises a resistor, one end of the resistor is connected with the ground, the other end of the resistor is connected with a port of the control unit, different starting modes can be selected by the port, and the storage unit adopts FM25L256.
4. A CMOS reference voltage source with high stability and low temperature drift as defined in claim 1, wherein: the gain of the operational amplifier unit is adjusted to adjust the power supply rejection performance produced by the reference circuit.
5. A CMOS reference voltage source with high stability and low temperature drift as defined in claim 1, wherein: the analog-to-digital unit adopts an LTC2415 analog-to-digital converter.
6. A CMOS reference voltage source with high stability and low temperature drift as defined in claim 1, wherein: the main function of the first filtering unit and the second filtering unit is to filter the alternating current circuit existing in the circuit, so that the direct current is smoother and more stable.
7. A CMOS reference voltage source with high stability and low temperature drift as defined in claim 1, wherein: the feedback unit is used for the reference circuit to feed back the regulating voltage so that the current mirror of the reference circuit is the same with the current in the tube.
8. A CMOS reference voltage source with high stability and low temperature drift as defined in claim 1, wherein: the sensor unit adopts a digital temperature sensor, and the voltage dividing unit is used for dividing voltage when the power supply end is abnormal in power supply.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310144081.1A CN116225124A (en) | 2023-02-21 | 2023-02-21 | CMOS reference voltage source with high stability and low temperature drift |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310144081.1A CN116225124A (en) | 2023-02-21 | 2023-02-21 | CMOS reference voltage source with high stability and low temperature drift |
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| CN116225124A true CN116225124A (en) | 2023-06-06 |
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| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310144081.1A Pending CN116225124A (en) | 2023-02-21 | 2023-02-21 | CMOS reference voltage source with high stability and low temperature drift |
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- 2023-02-21 CN CN202310144081.1A patent/CN116225124A/en active Pending
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