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The Designer's Guide Community Forum › Design › Analog Design › can mos gate connect to vdd or gnd directly?

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can mos gate connect to vdd or gnd directly? (Read 2998 times)

lhlbluesky_lhl Senior Member Offline Posts: 115	can mos gate connect to vdd or gnd directly? Mar 19^th, 2013, 5:47am can the NMOS gate be directly connected to VDD, or PMOS gate be directly connected to GND? does it will have relibility issues? such as gate breakdown, etc. usually, a series resistor will be used, what is the role of this series resistor? thanks.
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lhlbluesky_lhl Senior Member Offline Posts: 115	Re: can mos gate connect to vdd or gnd directly? Reply #1 - Mar 19^th, 2013, 6:59am here is a symbolic picture, thanks.
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raja.cedt Senior Fellow Offline Posts: 1516 Germany	Re: can mos gate connect to vdd or gnd directly? Reply #2 - Mar 19^th, 2013, 7:13am Hello, that depends on the oxide breakdown voltage. But in general vdd is lesser than breakdown voltage. The purpose of the resister is to limit the current in case if they break due to ESD or in-case of fast spikes. Thanks, Raj.
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threepwood New Member Offline Posts: 8	Re: can mos gate connect to vdd or gnd directly? Reply #3 - Mar 23^rd, 2013, 5:19am For single oxyde devices in technologies below 90nm we (in our society) use to use -for more safety- a "tie-on" or "tie-down" logic cell (you'll probably find in your digital library).
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