Study on grounding for mixed signal circuits
Electromagnetic radiation has been a source of problem for engineers as devices operate at higher speed and is required to be smaller in size. In this report, EM radiation in a mixedsignal circuit will be studied in depth from a grounding perspective. Various literature recommend the use of a...
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| Format: | Final Year Project |
| Language: | English |
| Published: |
2012
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| Subjects: | |
| Online Access: | http://hdl.handle.net/10356/49619 |
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| Institution: | Nanyang Technological University |
| Language: | English |
| Summary: | Electromagnetic radiation has been a source of problem for engineers as devices operate at higher speed and is required to be smaller in size. In this report, EM radiation in a mixedsignal
circuit will be studied in depth from a grounding perspective. Various literature recommend the use of a full ground plane to allow return currents to flow in a smallest current loop as loop area determines a magnitude of the radiation.In this final year project, a simple mixed signal circuit was designed and its near-field and
far-field radiation measured and compared to FCC Part 15 Subpart B (3m) standards for reference. While maintaining the component and power plan layout consistent throughout all designs, 3 different types of ground configurations were used for comparison. Using a split power plane and full ground plane provides the best performance in terms of EM radiation from a PCB design approach. |
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