A Hall circuit with strong thermal stability
By designing a Hall circuit that includes graphene Hall devices and other key circuit components, the problem of poor stability in existing Hall circuits in high temperature environments is solved, and efficient detection data reading and improved thermal stability and sensitivity of the circuit are achieved.
Patent Information
- Application Number
- CN202421109639.9
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2024-05-21
- Publication Date
- 2025-04-01
- Estimated Expiration
- 2034-05-21
AI Technical Summary
The existing Hall circuits have poor stability in high temperature environments, which affect detection accuracy and sensitivity.
A Hall circuit including graphene Hall devices, amplifiers, voltage regulator sources, Schmitt flip-flops and successive approximation analog-to-digital converters was designed. The thermal stability and sensitivity of the circuit are improved through the high mobility and thin active region characteristics of the graphene material.
It realizes efficient reading of graphene Hall device detection data, improves the thermal stability and sensitivity of the circuit, and is suitable for applications in high-temperature environments.
Smart Images
Figure CN222704714U_ABST
Abstract
Description
Technical Field
[0001] The utility model relates to a Hall circuit with strong thermal stability. Background Art
[0002] The Hall device is based on the basic principle of the Hall effect. Under the action of the Lorentz force of the changing magnetic field, the change of the magnetic field is converted into an electrical signal output. Semiconductor materials have higher mobility and thinner active areas, but such materials generally have complex manufacturing processes and high prices. Therefore, the choice of Hall device materials has a greater impact on the Hall circuit. Utility Model Content
[0003] The technical problem to be solved by the utility model is: in order to overcome the above technical problems, the utility model provides a Hall circuit with strong thermal stability.
[0004] The utility model solves the technical problem by adopting the following technical solution: a Hall circuit with strong thermal stability, comprising a graphene Hall device, an amplifier, a voltage regulator, a Schmitt trigger and a successive approximation analog-to-digital converter, wherein the graphene Hall device has two control terminals and two electrode terminals, the two control terminals are respectively connected to the voltage regulator and the ground, one of the two electrode terminals is connected to the input terminal of the amplifier, the output terminal of the amplifier is connected to the Schmitt trigger and the successive approximation analog-to-digital converter, the voltage regulator is provided for the amplifier, the voltage regulator, the Schmitt trigger and the successive approximation analog-to-digital converter, and the graphene Hall device has two control terminals and two electrode terminals, the two control terminals are respectively connected to the voltage regulator and the ground, one of the two electrode terminals is connected to the input terminal of the amplifier, the output terminal of the amplifier is connected to the Schmitt trigger and the successive approximation analog-to-digital converter, and the voltage regulator is provided for the amplifier, the voltage regulator, the Schmitt trigger and the successive approximation analog-to-digital converter. power supply; the amplifier is a differential input single-ended output operational amplifier, the successive approximation analog-to-digital converter comprises a sampling and holding circuit, a digital-to-analog converter, a comparator, a successive approximation register and a timing control circuit, the output of the amplifier is connected to the non-inverting input of the comparator through the sampling and holding circuit, the inverting input of the comparator is connected to the output of the digital-to-analog converter, the output of the comparator is connected to the input of the digital-to-analog converter through the successive approximation register, and the sampling and holding circuit, the comparator and the successive approximation register control the timing through the timing control circuit.
[0005] The electrode end of the graphene Hall device is connected to the amplifier through a buffer, and the voltage regulator provides power for the buffer.
[0006] The output end of the comparator is connected to the input end of the successive approximation register through a latch.
[0007] The beneficial effect of the utility model is that the utility model provides a Hall circuit with strong thermal stability, which adopts a graphene Hall device, an amplifier, a voltage regulator, a Schmitt trigger and a successive approximation analog-to-digital converter to realize the readout of the detection data of the graphene Hall device, and the graphene material has an extremely high mobility and an extremely thin active area. Therefore, the utility model adopts a graphene Hall device and has the advantages of the graphene material, so that the circuit has high sensitivity and strong thermal stability. BRIEF DESCRIPTION OF THE DRAWINGS
[0008] The utility model is further described below in conjunction with the accompanying drawings and embodiments.
[0009] Figure 1 The utility model is a circuit block diagram of a Hall circuit with strong thermal stability.
[0010] Figure 2 The utility model is a circuit block diagram of a successive approximation analog-to-digital converter. DETAILED DESCRIPTION
[0011] Now the utility model is further described in detail with reference to the accompanying drawings. These drawings are simplified schematic diagrams, which only illustrate the basic structure of the utility model in a schematic manner, and therefore only show the components related to the utility model.
[0012] like Figure 1 As shown, a Hall circuit with strong thermal stability of the utility model includes a graphene Hall device, an amplifier, a voltage regulator, a Schmitt trigger and a successive approximation analog-to-digital converter, wherein the graphene Hall device has two control terminals and two electrode terminals, the two control terminals are respectively connected to the voltage regulator and the ground, one of the two electrode terminals is connected to the input terminal of the amplifier, the output terminal of the amplifier is connected to the Schmitt trigger and the successive approximation analog-to-digital converter, and the voltage regulator provides power for the amplifier, the voltage regulator, the Schmitt trigger and the successive approximation analog-to-digital converter. The amplifier amplifies the output voltage signal of the Hall device to the full swing input range of the subsequent analog-to-digital converter. The conversion accuracy of the successive approximation analog-to-digital converter is related to the detection accuracy, and the introduction of the Schmitt trigger can mark the threshold point of the magnetic field change.
[0013] The amplifier is a differential input single-ended output operational amplifier, such as Figure 2 As shown, the successive approximation analog-to-digital converter includes a sampling and holding circuit, a digital-to-analog converter, a comparator, a successive approximation register and a timing control circuit. The output of the amplifier is connected to the non-inverting input of the comparator through the sampling and holding circuit, the inverting input of the comparator is connected to the output of the digital-to-analog converter, the output of the comparator is connected to the input of the digital-to-analog converter through the successive approximation register, and the sampling and holding circuit, the comparator and the successive approximation register are controlled by the timing control circuit. The sampling and holding circuit, the comparator and the successive approximation register respectively use different timings, and the timing control circuit provides timing control.
[0014] The electrode end of the graphene Hall device is connected to the amplifier through a buffer, and the voltage regulator provides power to the buffer. In order to prevent the output impedance of the Hall device from affecting the input impedance of the subsequent amplifier circuit, a first-level unity gain buffer needs to be introduced at the input end for isolation protection.
[0015] The output end of the comparator is connected to the input end of the successive approximation register through a latch.
[0016] The designs of the differential input single-ended output operational amplifier, the voltage regulator, the Schmitt trigger, the sample-and-hold circuit, the digital-to-analog converter, the comparator, the successive approximation register and the timing control circuit in the utility model can all be specifically designed according to actual conditions and will not be described in detail here.
[0017] The utility model discloses a Hall circuit with strong thermal stability, which adopts a graphene Hall device, an amplifier, a voltage regulator, a Schmitt trigger and a successive approximation analog-to-digital converter to realize the readout of the detection data of the graphene Hall device. The graphene material has an extremely high mobility and an extremely thin active area. Therefore, the utility model adopts the graphene Hall device and has the advantages of the graphene material, so that the circuit has high sensitivity and strong thermal stability.
[0018] Based on the above ideal embodiments of the utility model, the relevant staff can make various changes and modifications without deviating from the technical concept of the utility model through the above description. The technical scope of the utility model is not limited to the content of the specification, and its technical scope must be determined according to the scope of the claims.
Claims
1. A Hall circuit with strong thermal stability, characterized in that: It includes a graphene Hall device, an amplifier, a voltage regulator, a Schmitt trigger and a successive approximation analog-to-digital converter, wherein the graphene Hall device has two control terminals and two electrode terminals, the two control terminals are respectively connected to the voltage regulator and the ground, one of the two electrode terminals is connected to the input terminal of the amplifier, the output terminal of the amplifier is connected to the Schmitt trigger and the successive approximation analog-to-digital converter, and the voltage regulator provides power for the amplifier, the voltage regulator, the Schmitt trigger and the successive approximation analog-to-digital converter; The amplifier is a differential input single-ended output operational amplifier, the successive approximation analog-to-digital converter comprises a sampling and holding circuit, a digital-to-analog converter, a comparator, a successive approximation register and a timing control circuit, the output of the amplifier is connected to the non-inverting input of the comparator through the sampling and holding circuit, the inverting input of the comparator is connected to the output of the digital-to-analog converter, the output of the comparator is connected to the input of the digital-to-analog converter through the successive approximation register, and the sampling and holding circuit, the comparator and the successive approximation register control the timing through the timing control circuit.
2. The Hall circuit with strong thermal stability as claimed in claim 1, characterized in that: The electrode end of the graphene Hall device is connected to the amplifier through a buffer, and the voltage regulator provides power for the buffer.
3. The Hall circuit with strong thermal stability as claimed in claim 1, characterized in that: The output end of the comparator is connected to the input end of the successive approximation register through a latch.