Capacitances in NAND2 depletion mode nmos logic

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SUMMARY

The discussion focuses on the capacitances involved in NAND2 depletion mode NMOS logic, specifically addressing the absence of Cgs and Cdb components in the analysis. Participants clarify that Csb is not included for the bottom NMOS due to the substrate being connected to ground, which effectively shorts the body to the source. This configuration influences the load capacitance (Cload) and its components, prompting a request for further resources to understand these concepts better.

PREREQUISITES
  • Understanding of NMOS transistor operation in depletion mode
  • Familiarity with load capacitance (Cload) in digital circuits
  • Knowledge of circuit diagrams and their components
  • Basic principles of semiconductor physics
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  • Research the role of capacitances in NMOS logic circuits
  • Study the impact of substrate connections on transistor behavior
  • Learn about load capacitance calculations in digital logic design
  • Explore resources on depletion mode transistors and their applications
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Electrical engineers, circuit designers, and students studying digital logic who seek to deepen their understanding of NMOS transistor behavior and capacitance effects in logic circuits.

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Why we are not writing Cgs Cdb in depletion mode nmos here
why no Csb in bottom nmos
Can somebody please explain how to write which components of Cload or provide some links from where i can understand it better
?temp_hash=b7db7cc13cc7a15ef535142fbb7807fc.jpg
?temp_hash=b7db7cc13cc7a15ef535142fbb7807fc.jpg

thank you,
this picture is from http://books.google.co.in/books?id=XUruXhP2s6gC&lpg=PP1&pg=PA285#v=onepage&q&f=false
 

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There is so CsbB because the body is shorted to the source of the bottom transistor (in this circuit the substrate is connected to ground).
 

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