Understanding the Region of Operation for CMOS Transmission Gate: VDD vs Ground

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SUMMARY

The discussion focuses on determining the operational regions of n-channel and p-channel MOSFETs in a CMOS transmission gate under different voltage conditions. When the control voltage is at VDD (5V) and both I/O terminals are also at VDD, both MOSFETs are in the ON state. Conversely, when the control voltage remains at VDD while the I/O terminals are grounded, the operational state of the MOSFETs changes, necessitating a deeper understanding of how I/O terminal voltages influence their behavior. The importance of both n-channel and p-channel transistors in CMOS switches is highlighted as a critical aspect of their functionality.

PREREQUISITES
  • Understanding of CMOS technology and its components
  • Knowledge of MOSFET operation principles
  • Familiarity with voltage levels in digital circuits
  • Basic concepts of transmission gates in electronic design
NEXT STEPS
  • Research the operational characteristics of n-channel and p-channel MOSFETs
  • Study the role of control voltages in CMOS transmission gates
  • Learn about the impact of I/O terminal voltages on MOSFET states
  • Explore application notes on CMOS switches, such as those from Maxim Integrated
USEFUL FOR

Electrical engineers, students studying semiconductor devices, and professionals involved in digital circuit design will benefit from this discussion, particularly those focused on CMOS technology and transmission gate applications.

pumas
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Hello,
I'm supposed to determine the region of operation of both the n-channel and the p-channel MOSFET'S when the control voltage is at VDD(5V) and both I/O terminals are at VDD. Also I have to figure out the region of operation when the control voltage is at VDD but the I/O terminals are at ground.

I think that in both cases the p-channel and the n-channel will be ON. But I don't understand how the I/O terminals affect the region of operation of the MOSFETs. Can anyone help me? :confused:

Thank you
 

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Thread moved to homework forums. Welcome to the PF, pumas, but please be sure to post homework and coursework like this in the appropriate homework forum, and not in the general forums like the EE forum.

To help you with your question, I googled CMOS switch tutorial, and got lots of good hits. Here is a good one from Maxim (they make CMOS switches):

http://www.maxim-ic.com/appnotes.cfm/appnote_number/638

All of the voltages are important in the operation of CMOS switches. Quiz question -- why do you need both an n-channel and a p-channel transistor in each switch?
 
Thanks for your help
 

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