Lesson plan
Body effect
The body effect (also known as substrate bias effect) is an undesired second-order effect present in field-effect transistors (MOSFET) that describes the change in transistor's threshold voltage ( V_{th} ) resulting from a potential difference between the source and the bulk (substrate) terminals. While ideal first-order MOSFET models assume that the source and bulk are tied to the same potential, in many integrated circuit topologies the source voltage varies dynamically while the substrate is kept at a global reference potential. This voltage difference alters the internal electrostatic balance of the device, strongly modifying the device biasing condition, switching characteristics and amplification capabilities.
Article summary
The body effect (also known as substrate bias effect) is an undesired second-order effect present in field-effect transistors (MOSFET) that describes the change in transistor's threshold voltage ( V_{th} ) resulting from a potential difference between the source and the bulk (substrate) terminals. While ideal first-order MOSFET models assume that the source and bulk are tied to the same potential, in many integrated circuit topologies the source voltage varies dynamically while the substrate is kept at a global reference potential. This voltage difference alters the internal electrostatic balance of the device, strongly modifying the device biasing condition, switching characteristics and amplification capabilities.
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Discussion questions
- Summarise the article in your own words. Which single claim would you verify first, and why?
- Which claim in this article is most likely to be revised as the sources update? How would you check its current status?
- If two sources disagreed about one of these facts, what would you need in order to trust one over the other?
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Key claims and bibliography are generated from the same tracked claims and sources as the article page.