| Author |
Message |
jn_mohit
Joined: 20 Jun 2004
Posts: 6
|
 18 Jul 2004 9:04 Spice parameters from mosis and Ro of MOSFET |
|
|
|
Please help me with the following questions, they have confused me a lot
1) In the spice parameters file provided by mosis (for example http://www.mosis.org/cgi-bin/cgiwrap/umosis/swp/params/tsmc-035/n88y-params.txt ), What does K' refers to, it says here that K' is (uo*Cox/2) but when i use this value for my simulations I dont get a correct result, rather this K' value is closer to uo*cox.
2) If I have to find Ro for a MOS transistor, i use formula 1/(lambda*Id), where lambda is channel length modulation factor, how can I find lambda using this spice file.
I dont want to find exact Ro for each transistor, but would like to know the approximate value which I should use for hand calculations and basic analysis.
Thankyou
|
|
| Back to top |
|
 |
jyq_analog
Joined: 10 Dec 2003
Posts: 17
|
| 21 Jul 2004 13:50 Spice parameters from mosis and Ro of MOSFET |
|
|
|
The Lambda is provided.
The ro will chang with the different Vds .When the Vds is low, the change is very large. Hopeless to model ro with this simple equation.
|
|
| Back to top |
|
|
jn_mohit
Joined: 20 Jun 2004
Posts: 6
|
| 21 Jul 2004 15:27 Re: Spice parameters from mosis and Ro of MOSFET |
|
|
|
| Hi thanks for your reply, but probably you didnt get my question, Ro ofcourse changes, but when you do the basic design of an op-amp lets say, you cant take that in to account, so I wanted to know what lambda to take in order to begin the designing.
|
|
| Back to top |
|
|
v_naren
Guest
|
| 21 Jul 2004 17:18 Re: Spice parameters from mosis and Ro of MOSFET |
|
|
|
| http://www.edaboard.com/ftopic81808.html
|
|
| Back to top |
|
|
