Threshold voltage of the transistor. Why is it different?

EDAboard.com Forum Index -> RF, Microwave, Antennas and Optics -> Threshold voltage of the transistor. Why is it different?

Author

Message

wccheng

Joined: 16 May 2004
Posts: 231
Helped: 1

07 Apr 2005 16:53 Threshold voltage of the transistor. Why is it different?

Dear all,

I have some quesitons about the threshold voltage of the CMOS. I hope anyone could answer it. Thanks first. Smile

For the same circuit configuration (common source) and under same bias voltage and same aspect ratio of the two NMOS (one is 10/1 and second one is 100/10), why the threshold voltage of the 100/10 is higher than 10/1 ? Actually, there Vsb = 0 in two case.

Thanks

wccheng

Google
AdSense
Google Adsense

07 Apr 2005 16:53 Ads

BigBoss

Joined: 17 Nov 2001
Posts: 1039
Helped: 63
Location: Earth

07 Apr 2005 19:59 Threshold voltage of the transistor. Why is it different?

Reason of Channel-Body voltages are different so Vt are different of two transistor.For more information look at page 106-111 in the book of Yannis Tsividis, Operation And Modelling of MOS Transistor, 2nd Edition.