Magnetic sensitivity temperature compensation circuit and programmable linear Hall sensor chip
A temperature compensation circuit and sensitivity technology, applied in the direction of converting sensor output, using electromagnetic/magnetic devices to transmit sensing components, instruments, etc., can solve problems such as sensitivity reduction and output signal amplitude reduction, and achieve the effect of increasing sensitivity
- Summary
- Abstract
- Description
- Claims
- Application Information
AI Technical Summary
Problems solved by technology
Method used
Image
Examples
Example Embodiment
[0026] Example 1:
[0027] Such as Figure 1-3 As shown, the present invention includes a magnetic sensitivity temperature compensation circuit including Hall Plate and a differential amplifier. The Hall plate induces a magnetic field signal and converts it into a Hall voltage signal and outputs it to the input end of the differential amplifier. The difference is that the differential amplifier is a differential amplifier with adjustable gain, the tail current source Ibias on the differential amplifier is proportional to the absolute temperature, and the load resistances R1 and R2 on the differential amplifier are all of the same shape and material as the Hall sheet. .
[0028] Such as figure 1 As shown in the circuit, the differential amplifier includes op amp input NPN transistor pairs Q1 and Q2, a tail current source Ibias, a current mirror used to provide the gain amplification factor of the differential amplifier, and a series connection load resistor R1 and R2. The current ...
Example Embodiment
[0039] Example 2:
[0040] This embodiment is preferably as follows on the basis of Embodiment 1: The tail current source Ibias is a tail current source Ibias that can be programmed to control the amplification factor of the Hall voltage.
[0041] Such as image 3 As shown, it is an implementation of the tail current source Ibias. There are other different implementations of the tail current source Ibias. This example is a 4bit programming accuracy. The actual accuracy can be adjusted according to specific application needs. The tail current source Ibias includes a current source IPTAT proportional to the absolute temperature and an NMOS current mirror NM0. One end of the current source IPTAT is connected to the source of the NMOS current mirror NM0, the other end of the current source IPTAT is connected to the power supply VDD, and the drain of the NMOS current mirror is grounded. NM0 mirrors the current source IPTAT to the transistors NM1 to NM4, the NMOS transistors SN1 to SN4 s...
Example Embodiment
[0043] Example 3:
[0044] Based on the above-mentioned embodiment, this embodiment is preferably as follows: the voltage of the common node of the load resistors R1 and R2 is maintained at 1 / 2 of the power supply voltage through a voltage follower output. Only when the voltage of the common node is kept at this value, can the output signal swing of the linear Hall sensor chip be better guaranteed.
PUM
Abstract
Description
Claims
Application Information
- R&D Engineer
- R&D Manager
- IP Professional
- Industry Leading Data Capabilities
- Powerful AI technology
- Patent DNA Extraction
Browse by: Latest US Patents, China's latest patents, Technical Efficacy Thesaurus, Application Domain, Technology Topic.
© 2024 PatSnap. All rights reserved.Legal|Privacy policy|Modern Slavery Act Transparency Statement|Sitemap