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Design >> Analog Design >> Moscap
https://designers-guide.org/forum/YaBB.pl?num=1265716005

Message started by siddhartha .k on Feb 9^th, 2010, 3:46am

Title: Moscap
Post by siddhartha .k on Feb 9^th, 2010, 3:46am

Hi.. What is advantage using Nmoscap in Nwell why not use Nmoscap in Pwell

Title: Re: Moscap
Post by Berti on Feb 9^th, 2010, 4:28am

Weird question .. I think the "Nmoscap in Nwell" you are referring to is an accumulation mode capacitor!

Regards

Title: Re: Moscap
Post by Mooraka on Feb 9^th, 2010, 2:20pm

I think NCAP - PMOS FET with P+ S/D replaced with N+ diffusion, PCAP - NMOS FET with N+ S/D replaced with P+ diffusion.

NCAP is in DNW/Nwell and PCAP is in Pwell/Psub.

Do you mean what is the advantage of MOS cap over MOS FET as cap?

Thanks

Title: Re: Moscap
Post by raja.cedt on Feb 9^th, 2010, 8:38pm

hi,
your cap varies monotonically with voltage,where as in case of nmos in pwell will give non-monotonic plot.

Thanks,
Rajasekhar.

Title: Re: Moscap
Post by siddhartha .k on Feb 10^th, 2010, 8:11am

Hi Thanks to all

what is the advantage of MOS cap over MOS FET as cap?
& what is the reson NMOScap body is a Nwell instead of Psubstrat .

Thanks,
siddhartha.k