CN116593777A - High-precision measurement integrated circuit based on voltage-stabilizing RFC - Google Patents
High-precision measurement integrated circuit based on voltage-stabilizing RFC Download PDFInfo
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- CN116593777A CN116593777A CN202310385278.4A CN202310385278A CN116593777A CN 116593777 A CN116593777 A CN 116593777A CN 202310385278 A CN202310385278 A CN 202310385278A CN 116593777 A CN116593777 A CN 116593777A
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- rfc
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- 238000005259 measurement Methods 0.000 title claims abstract description 30
- 230000000087 stabilizing effect Effects 0.000 claims abstract description 27
- 238000012545 processing Methods 0.000 claims abstract description 10
- 239000003990 capacitor Substances 0.000 claims description 26
- 230000033228 biological regulation Effects 0.000 claims description 9
- 230000003321 amplification Effects 0.000 claims description 3
- 238000003199 nucleic acid amplification method Methods 0.000 claims description 3
- 239000003381 stabilizer Substances 0.000 description 7
- 238000006243 chemical reaction Methods 0.000 description 5
- 230000010355 oscillation Effects 0.000 description 4
- 230000006641 stabilisation Effects 0.000 description 4
- 238000011105 stabilization Methods 0.000 description 4
- 230000003071 parasitic effect Effects 0.000 description 3
- 230000001105 regulatory effect Effects 0.000 description 3
- 238000010586 diagram Methods 0.000 description 2
- 238000007599 discharging Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 238000000034 method Methods 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 230000003111 delayed effect Effects 0.000 description 1
- 230000010354 integration Effects 0.000 description 1
- 238000012986 modification Methods 0.000 description 1
- 230000004048 modification Effects 0.000 description 1
- 230000003287 optical effect Effects 0.000 description 1
- 230000007306 turnover Effects 0.000 description 1
Classifications
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- G—PHYSICS
- G01—MEASURING; TESTING
- G01R—MEASURING ELECTRIC VARIABLES; MEASURING MAGNETIC VARIABLES
- G01R27/00—Arrangements for measuring resistance, reactance, impedance, or electric characteristics derived therefrom
- G01R27/02—Measuring real or complex resistance, reactance, impedance, or other two-pole characteristics derived therefrom, e.g. time constant
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- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K21/00—Details of pulse counters or frequency dividers
- H03K21/02—Input circuits
-
- H—ELECTRICITY
- H03—ELECTRONIC CIRCUITRY
- H03K—PULSE TECHNIQUE
- H03K5/00—Manipulating of pulses not covered by one of the other main groups of this subclass
- H03K5/22—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral
- H03K5/24—Circuits having more than one input and one output for comparing pulses or pulse trains with each other according to input signal characteristics, e.g. slope, integral the characteristic being amplitude
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- Physics & Mathematics (AREA)
- General Physics & Mathematics (AREA)
- Nonlinear Science (AREA)
- Measurement Of Current Or Voltage (AREA)
Abstract
The invention discloses a high-precision measurement integrated circuit based on voltage-stabilizing RFC. In the invention, the following components are added: the input end of the voltage stabilizing module is connected with a power supply voltage source B10, and the output end of the voltage stabilizing module outputs voltage for supplying power to the circuit; the external circuit outputs a voltage signal to the non-inverting input end of the comparator, and the inverting input end of the comparator inputs a comparison voltage; the output end of the comparator outputs a signal to the counting module; the signals output by the timing module and the counting module are transmitted to the data processing output module for output through the gate logic controller; the data processing module accumulates the data obtained by the RFC measuring circuit for 8 times, then averages the data, and outputs the obtained result. According to the invention, the voltage stabilizing module is used for supplying power, and the register is used for adjusting and changing the voltage stabilized by the voltage stabilizing module so as to provide different working voltages for RFC; by setting the timing module, the acquired time is more accurate and uniform, and the accuracy and stability of the measured data are improved.
Description
Technical Field
The invention belongs to the technical field of software development, and particularly relates to a high-precision measurement integrated circuit based on voltage stabilizing RFC.
Background
RFC (ResistortoFrequencyConverter) is a resistor/frequency conversion circuit, which is a method for obtaining the measured resistance value by utilizing the charge-discharge principle of a resistor capacitor to generate RC oscillation on a corresponding port, reading the pulse number in a certain time or the time required by a certain number of pulses by using a counting input port, and comparing the oscillation frequency with the oscillation frequency under a standard resistor after calculating the oscillation frequency.
The conversion principle of RFC is as follows: when the charge and discharge coefficients are the same in the inversion level: f=1/t=1/RC;
when the turnover level is the same, the RFC conversion frequency is only related to the resistor R and the capacitor C and is irrelevant to other factors, but the original resistor R and the capacitor C are changed due to the existence of certain internal resistance and parasitic capacitance of various NAND gates, inverters, comparators and counter wires of an RFC circuit in a chip, and the internal resistance and the parasitic capacitance can change along with the change of voltage, so that a voltage stabilizing module is needed to be made for the whole RFC module to eliminate errors caused by the change of external voltage, thereby realizing more accurate measurement.
Because the software switch RFC needs to execute instructions and other programs are embedded to execute sometimes, the time for opening and closing is delayed and the turning level is not the same, the time module for automatically opening and closing the RFC count by the hardware is provided, so that the time length of the RFC turning level at each time is the same, and more accurate measurement is realized
Disclosure of Invention
The invention aims to provide a high-precision measurement integrated circuit based on voltage-stabilizing RFC, which is powered by a voltage-stabilizing module, can use different power supply voltages for a chip, realizes voltage stabilization and then supplies power to the RFC, and can provide different working voltages for the RFC by regulating and changing the voltage of the voltage stabilization through a register; by setting the timing module, the acquired time is more accurate and uniform, and the accuracy and stability of the measured data are improved.
In order to solve the technical problems, the invention is realized by the following technical scheme:
the invention relates to a high-precision measurement integrated circuit based on voltage regulation RFC, which comprises a voltage regulation module, wherein the input end of the voltage regulation module is connected with a power supply voltage source B10, and the output end of the voltage regulation module outputs voltage for supplying power to a circuit; the voltage stabilizing module controls a switch and adjusts voltage through a register; the RFC measurement circuit comprises an external circuit, a timing module and a counting module; the timing module outputs a timing signal; the external circuit outputs a voltage signal to a non-inverting input end of the comparator, and an inverting input end of the comparator inputs a comparison voltage; the output end of the comparator outputs a signal to the counting module; the signals output by the timing module and the counting module are transmitted to the data processing output module for output through the gate logic controller; the data processing module accumulates the data obtained by the RFC measuring circuit for 8 times, then averages the data, and outputs the obtained result.
Preferably, the voltage stabilizing module is further connected to a grounding capacitor C2, and the grounding capacitor C2 is 0.1uF.
Preferably, the voltage stabilizing module comprises a reference voltage source Vref, an amplifier OPA and a MOS switch; the reference voltage source Vref outputs a voltage signal which is amplified by an amplifier and then is output to a source electrode of the MOS switch; the gate of the MOS switch is connected with the register switch, and the drain of the MOS switch outputs a voltage source VLDO.
Preferably, the amplifier OPA adjusts the amplification factor by means of a register.
Preferably, the inverting input of the comparator inputs a comparison voltage of 1/2VLDO.
Preferably, the external circuit of the RFC measurement circuit comprises a temperature sensitive resistor RT, a reference resistor R1 and an RFC charge-discharge capacitor C1; one end of the temperature sensitive resistor RT and one end of the reference resistor R1 are connected with pins of the RFC measuring circuit; the other ends of the temperature-sensitive resistor RT and the reference resistor R1 are connected in series with RFC charge-discharge capacitors C1 to the ground; the non-inverting input end of the comparator is connected to the intermediate connection point of the RFC charge-discharge capacitor C1, the temperature-sensitive resistor RT and the reference resistor R1.
The invention has the following beneficial effects:
the invention supplies power through the voltage stabilizing module, can use different power supply voltages for the chip, realizes voltage stabilization and then supplies power for RFC, and can provide different working voltages for RFC by regulating and changing the voltage stabilized through the register; by setting the timing module, the acquired time is more accurate and uniform, and the accuracy and stability of the measured data are improved.
Of course, it is not necessary for any one product to practice the invention to achieve all of the advantages set forth above at the same time.
Drawings
In order to more clearly illustrate the technical solutions of the embodiments of the present invention, the drawings that are needed for the description of the embodiments will be briefly described below, and it is obvious that the drawings in the following description are only some embodiments of the present invention, and that other drawings may be obtained according to these drawings without inventive effort for a person skilled in the art.
FIG. 1 is a system block diagram of a high-precision measurement integrated circuit based on voltage regulation RFC of the present invention;
fig. 2 is a system block diagram of a voltage stabilizing module.
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.
Referring to fig. 1, the invention relates to a high-precision measurement integrated circuit based on voltage-stabilizing RFC, which comprises a voltage-stabilizing module and an RFC measurement circuit;
the input end of the voltage stabilizing module is connected with a power supply voltage source B10, the voltage stabilizing module is also connected with a grounding capacitor C2, and the grounding capacitor C2 is 0.1uF; the capacitor is used for stabilizing the voltage stabilizer, is not influenced by wiring, external parasitic capacitance and interference, and achieves the effect of accurate voltage stabilization, and the C2 capacitor is formed by integrating 0.1uf into the chip at relatively high cost, so that the capacitor is externally connected with the chip, and the capacitor has the advantage that the output voltage value of the voltage stabilizer can be stabilized by increasing the size of C2 under the condition of strong external interference.
The output end of the voltage stabilizing module outputs voltage to supply power for the circuit; the voltage stabilizing module controls a switch and adjusts voltage through a register;
the voltage stabilizing module comprises a reference voltage source Vref, an amplifier OPA and a MOS switch; the reference voltage source Vref outputs a voltage signal which is amplified by an amplifier and then is output to a source electrode of the MOS switch; the grid electrode of the MOS switch is connected with the register switch, and the drain electrode of the MOS switch outputs a voltage source VLDO; the amplifier OPA adjusts the amplification factor through a register;
the RFC measurement circuit comprises an external circuit, a timing module and a counting module; the timing module outputs a timing signal; the external circuit outputs a voltage signal to the non-inverting input end of the comparator, and the inverting input end of the comparator inputs a comparison voltage; the inverting input end of the comparator inputs the comparison voltage to be 1/2VLDO; the output end of the comparator outputs a signal to the counting module;
the external circuit of the RFC measurement circuit comprises a temperature sensitive resistor RT, a reference resistor R1 and an RFC charge-discharge capacitor C1; one end of the temperature sensitive resistor RT and one end of the reference resistor R1 are connected with pins of the RFC measuring circuit; the other ends of the temperature-sensitive resistor RT and the reference resistor R1 are connected in series with RFC charge-discharge capacitors C1 to the ground; the noninverting input end of the comparator is connected to the intermediate connection point of the RFC charge-discharge capacitor C1, the temperature-sensitive resistor RT and the reference resistor R1.
Charging and discharging the C1 through R1 and RT respectively to obtain two frequencies, and then obtaining a count value, wherein the count value obtained each time is the same under the same temperature of different voltages, basically no deviation exists, and the calculated temperature cannot fluctuate along with the change of the voltage and the acquisition time, so that the accuracy of acquiring the temperature can be improved.
The signals output by the timing module and the counting module are transmitted to the data processing output module for output through the gate logic controller; the data processing module accumulates the data obtained by the RFC measuring circuit for 8 times, then averages the data, and outputs the obtained result.
Embodiment one:
the embodiment is a workflow of a high-precision measurement integrated circuit based on voltage stabilizing RFC:
step 1: as shown in fig. 2, the voltage stabilizing module part of the high-precision measurement integrated circuit based on voltage stabilizing RFC of the present invention consists of a reference voltage Vref, an amplifier, and a mos switch circuit, wherein the reference voltage is used for providing a relatively stable voltage point, the amplifier is used for amplifying voltages with different requirements, and the mos switch circuit is used for making the stabilized driving current larger;
step 2: as shown in fig. 2, the voltage stabilizing module can realize the switch mos through the register, so that the output of the switching voltage stabilizer is realized, and the advantage of the output of the switching voltage stabilizer is that the switching voltage stabilizer can be turned off without using the voltage stabilizer to reduce the power consumption of a chip, and the switching voltage stabilizer is turned on again when in use; different voltages can be regulated through the register to adapt to different application scenes;
step 3: as shown in fig. 2, the RFC results are processed by a counting module and a timing module, when the timing module starts, the counting module starts counting, and when the timing module times, the counting module stops counting, and the counting module is not started until the timing module stops counting, and the counted data can be read out at the moment, so that the timing module can be started and closed, and the advantage of ensuring that the RFC conversion period is the same every time, thereby improving the measurement accuracy of RFC;
step 4: as shown in fig. 2, the RFC measurement circuit comprises an external resistor capacitor, an internal inverting comparator and a counting module, and can charge the capacitor by using the resistor when the voltage is lower than the set voltage by comparing the resistor with the potential at one end of the capacitor and discharging the capacitor by using the resistor when the voltage is higher than the set voltage, so as to obtain a resistor/frequency conversion effect;
step 5: the data processing circuit accumulates the data obtained by RFC measurement for 8 times, then averages the data, and outputs the obtained result, so that the RFC measurement data can be further stabilized, and a more accurate measurement result is obtained.
Embodiment two:
in this embodiment: the voltage stabilizing module, the timing module for automatically opening and closing RFC count, the RFC measuring circuit and the data processing circuit are all arranged in the same chip, and the work of each module can be realized through the programming of a program, so that the integration level is high, the external interference is less, the space and the cost can be saved, and the measuring precision is improved.
It should be noted that, in the above system embodiment, each unit included is only divided according to the functional logic, but not limited to the above division, so long as the corresponding function can be implemented; in addition, the specific names of the functional units are also only for distinguishing from each other, and are not used to limit the protection scope of the present invention.
In addition, it will be understood by those skilled in the art that all or part of the steps in implementing the methods of the embodiments described above may be implemented by a program to instruct related hardware, and the corresponding program may be stored in a computer readable storage medium, such as a ROM/RAM, a magnetic disk or an optical disk, etc.
The preferred embodiments of the invention disclosed above are intended only to assist in the explanation of the invention. The preferred embodiments are not exhaustive or to limit the invention to the precise form disclosed. Obviously, many modifications and variations are possible in light of the above teaching. The embodiments were chosen and described in order to best explain the principles of the invention and the practical application, to thereby enable others skilled in the art to best understand and utilize the invention. The invention is limited only by the claims and the full scope and equivalents thereof.
Claims (6)
1. A high-precision measurement integrated circuit based on voltage-stabilizing RFC is characterized by comprising
The input end of the voltage stabilizing module is connected with a power supply voltage source B10, and the output end of the voltage stabilizing module outputs voltage for supplying power to the circuit; the voltage stabilizing module controls a switch and adjusts voltage through a register;
the RFC measurement circuit comprises an external circuit, a timing module and a counting module; the timing module outputs a timing signal;
the external circuit outputs a voltage signal to a non-inverting input end of the comparator, and an inverting input end of the comparator inputs a comparison voltage; the output end of the comparator outputs a signal to the counting module;
the signals output by the timing module and the counting module are transmitted to the data processing output module for output through the gate logic controller; the data processing module accumulates the data obtained by the RFC measuring circuit for 8 times, then averages the data, and outputs the obtained result.
2. The high-precision measurement integrated circuit according to claim 1, wherein the voltage stabilizing module is further connected to a grounding capacitor C2, and the grounding capacitor C2 is 0.1uF.
3. The high-precision measurement integrated circuit based on voltage regulation RFC as claimed in claim 1, wherein said voltage regulation module comprises a reference voltage source Vref, an amplifier OPA and a MOS switch;
the reference voltage source Vref outputs a voltage signal which is amplified by an amplifier and then is output to a source electrode of the MOS switch; the gate of the MOS switch is connected with the register switch, and the drain of the MOS switch outputs a voltage source VLDO.
4. A high precision measurement integrated circuit based on voltage regulation RFC as claimed in claim 3, wherein said amplifier OPA adjusts the amplification factor by means of a register.
5. A high-precision measurement integrated circuit based on voltage regulation RFC as claimed in claim 3, wherein the comparator has an inverting input for inputting a comparison voltage of 1/2VLDO.
6. The high-precision measurement integrated circuit based on the voltage stabilizing RFC as set forth in claim 1, wherein the external circuit of the RFC measurement circuit comprises a temperature sensitive resistor RT, a reference resistor R1 and an RFC charge-discharge capacitor C1;
one end of the temperature sensitive resistor RT and one end of the reference resistor R1 are connected with pins of the RFC measuring circuit; the other ends of the temperature-sensitive resistor RT and the reference resistor R1 are connected in series with RFC charge-discharge capacitors C1 to the ground;
the non-inverting input end of the comparator is connected to the intermediate connection point of the RFC charge-discharge capacitor C1, the temperature-sensitive resistor RT and the reference resistor R1.
Priority Applications (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310385278.4A CN116593777A (en) | 2023-04-12 | 2023-04-12 | High-precision measurement integrated circuit based on voltage-stabilizing RFC |
Applications Claiming Priority (1)
| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CN202310385278.4A CN116593777A (en) | 2023-04-12 | 2023-04-12 | High-precision measurement integrated circuit based on voltage-stabilizing RFC |
Publications (1)
| Publication Number | Publication Date |
|---|---|
| CN116593777A true CN116593777A (en) | 2023-08-15 |
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Family Applications (1)
| Application Number | Title | Priority Date | Filing Date |
|---|---|---|---|
| CN202310385278.4A Pending CN116593777A (en) | 2023-04-12 | 2023-04-12 | High-precision measurement integrated circuit based on voltage-stabilizing RFC |
Country Status (1)
| Country | Link |
|---|---|
| CN (1) | CN116593777A (en) |
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2023
- 2023-04-12 CN CN202310385278.4A patent/CN116593777A/en active Pending
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