Chopper offset stabilized current sensing amplifier
Current sensing is an indispensable technique employed across various uses, prominently in facilitating energy conservation, protection, and motor drives. It serves as a critical tool for ensuring safety and optimizing the performance of industrial machines, motors and other applications. Th...
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| Other Authors: | |
| Format: | Final Year Project (FYP) |
| Language: | English |
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Nanyang Technological University
2024
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| Subjects: | |
| Online Access: | https://hdl.handle.net/10356/177036 |
| _version_ | 1826110211430023168 |
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| author | Low, Thien Shawn |
| author2 | Chang Joseph |
| author_facet | Chang Joseph Low, Thien Shawn |
| author_sort | Low, Thien Shawn |
| collection | NTU |
| description | Current sensing is an indispensable technique employed across various uses, prominently
in facilitating energy conservation, protection, and motor drives. It serves as a critical tool for
ensuring safety and optimizing the performance of industrial machines, motors and other
applications.
The design of current sensing amplifier demands low offset, which is hard to achieve
without using dynamic offset compensation techniques. However, commonly employed methods
such as chopping stabilisation and auto zero present several challenges. At current state of art, auto
zero does not deteriorate transient speed by employing ping pong approach. However, it requires
a considerable area to achieve similar offset reduction compared to chopper offset stabilisation.
Additionally, it introduces noise folding which exacerbates the white noise. While chopping
stabilisation technique offers significant noise and offset reduction, they lead to long settling time
due to the addition of low pass filter or ripple reduction techniques to reduce the ripple voltage.
To have the benefit of chopping stabilisation noise reduction while maintaining fast transient
response, chopper offset stabilisation had been proposed.
The aim of this project is to design a current sensing amplifier with low offset, low noise,
and good transient speed without sacrificing a large area. To circumvent the issues brought by
other dynamic offset compensation techniques, chopper offset stabilization technique is employed.
It operates by having two-frequency path where one of the paths is dynamic offset compensated
to compensate the offset of another path. This ensures the transient speed of the amplifier will not
be affected by dynamic offset compensation and ensure continuous operation of the current sense
amplifier without sacrificing large area. In this project, the offset of the amplifier can reduce below
5𝜇𝑉 with a transient speed of 2𝜇s which has met the design specifications while ensuring large
current sensing range.
In this project, the current sensing amplifier will be used in latching current limiter to
provide the exact loading current information for the user about the downstream loads. This
information can be further processed by the FPGA after ADC digitizing. |
| first_indexed | 2024-10-01T02:30:41Z |
| format | Final Year Project (FYP) |
| id | ntu-10356/177036 |
| institution | Nanyang Technological University |
| language | English |
| last_indexed | 2024-10-01T02:30:41Z |
| publishDate | 2024 |
| publisher | Nanyang Technological University |
| record_format | dspace |
| spelling | ntu-10356/1770362024-05-24T15:44:35Z Chopper offset stabilized current sensing amplifier Low, Thien Shawn Chang Joseph School of Electrical and Electronic Engineering Zero-Error Systems (ZES) EJSCHANG@ntu.edu.sg Engineering Low offset amplifier Chopper offset stabilization technique Current sensing amplifier Current sensing is an indispensable technique employed across various uses, prominently in facilitating energy conservation, protection, and motor drives. It serves as a critical tool for ensuring safety and optimizing the performance of industrial machines, motors and other applications. The design of current sensing amplifier demands low offset, which is hard to achieve without using dynamic offset compensation techniques. However, commonly employed methods such as chopping stabilisation and auto zero present several challenges. At current state of art, auto zero does not deteriorate transient speed by employing ping pong approach. However, it requires a considerable area to achieve similar offset reduction compared to chopper offset stabilisation. Additionally, it introduces noise folding which exacerbates the white noise. While chopping stabilisation technique offers significant noise and offset reduction, they lead to long settling time due to the addition of low pass filter or ripple reduction techniques to reduce the ripple voltage. To have the benefit of chopping stabilisation noise reduction while maintaining fast transient response, chopper offset stabilisation had been proposed. The aim of this project is to design a current sensing amplifier with low offset, low noise, and good transient speed without sacrificing a large area. To circumvent the issues brought by other dynamic offset compensation techniques, chopper offset stabilization technique is employed. It operates by having two-frequency path where one of the paths is dynamic offset compensated to compensate the offset of another path. This ensures the transient speed of the amplifier will not be affected by dynamic offset compensation and ensure continuous operation of the current sense amplifier without sacrificing large area. In this project, the offset of the amplifier can reduce below 5𝜇𝑉 with a transient speed of 2𝜇s which has met the design specifications while ensuring large current sensing range. In this project, the current sensing amplifier will be used in latching current limiter to provide the exact loading current information for the user about the downstream loads. This information can be further processed by the FPGA after ADC digitizing. Bachelor's degree 2024-05-24T08:12:16Z 2024-05-24T08:12:16Z 2024 Final Year Project (FYP) Low, T. S. (2024). Chopper offset stabilized current sensing amplifier. Final Year Project (FYP), Nanyang Technological University, Singapore. https://hdl.handle.net/10356/177036 https://hdl.handle.net/10356/177036 en B2055-231 application/pdf Nanyang Technological University |
| spellingShingle | Engineering Low offset amplifier Chopper offset stabilization technique Current sensing amplifier Low, Thien Shawn Chopper offset stabilized current sensing amplifier |
| title | Chopper offset stabilized current sensing amplifier |
| title_full | Chopper offset stabilized current sensing amplifier |
| title_fullStr | Chopper offset stabilized current sensing amplifier |
| title_full_unstemmed | Chopper offset stabilized current sensing amplifier |
| title_short | Chopper offset stabilized current sensing amplifier |
| title_sort | chopper offset stabilized current sensing amplifier |
| topic | Engineering Low offset amplifier Chopper offset stabilization technique Current sensing amplifier |
| url | https://hdl.handle.net/10356/177036 |
| work_keys_str_mv | AT lowthienshawn chopperoffsetstabilizedcurrentsensingamplifier |