Continue to Site

Welcome to EDAboard.com

Welcome to our site! EDAboard.com is an international Electronics Discussion Forum focused on EDA software, circuits, schematics, books, theory, papers, asic, pld, 8051, DSP, Network, RF, Analog Design, PCB, Service Manuals... and a whole lot more! To participate you need to register. Registration is free. Click here to register now.

How to find Channel Length Modulation factor Lamda

Status
Not open for further replies.

madhu01

Junior Member level 2
Joined
Feb 10, 2007
Messages
22
Helped
1
Reputation
2
Reaction score
0
Trophy points
1,281
Activity points
1,434
channel length modulation factor

Please help me .

Best Regards ,
Madhu.
 

how to find channel length modulation

Plot the Vds vs. Id characteristic of the device.The slope of the curve (in saturation region) will give the Ron of the device in saturation.Derive the expression for the Ron of the transistor in saturation and equate it to the measured Ron.Substitute for mu, cox etc and u will be able to calculate lambda.

Regards,
Dhasmana.
 

lamda length

lamda= 1/(rds . Ids).
So you can plot Ids vs Vds. take the derivative and then inverse you will get waveform of rds. Now multiply it with Ids curve and take the inverse you will get curve something like this
92_1175793407.jpg

Now you can find the lamda at your desired Vds.
Hope it helps
 
  • Like
Reactions: orz

    orz

    Points: 2
    Helpful Answer Positive Rating
channel length modulation, lambda

... and
rds~L/Id
 

triode region channel length modulation

yes as λ = 1/Leff (dL/dVds)
dL/dVds = channel length modulation parameter and you can find in model parameters (after doing the DC analysis) as pclm of the specified transistor.
 

channel length modulation factor lambda

Hai ,

Iam Not getting lamda value . By the above values iam getting 10 as lamda .
I want lamda to calculate U and Cox of the device .

Best Regards ,
Mahesh.
 

find channel length modulation

You dont need lamda then. Just bias the transistor in deep triode region and find the value of K. In triode there is no channel length modulation so no lambda in triode current equation.
Cox is constant so you can find mobility.
Btw, for 0.18 TSMC process Kn = 350 uA/V and Kp=80 uA/V. These values I get from simulation so may differ slightly from others.
 

find channel length modulation from id

Thank you very much Usman Hai. this is my very first post and i have just found my answer in here... i'l surely love this forum! i am also interested of obtaining lambda and i am using bsim3v3.1 as model...

but i think madhu01 wants to get the U and Cox from the saturation current equation that is why he's looking for the lambda. i also agree also to use the deep triod region equation.

madhu01, if you have the model, you can simply look it in there.. usually it is labeled as Uo. and you can solve cox using permittivity over tox. Tox can also be found at the model's parameters.
 

If you are using Cadence Virtuoso software, the value of Gds in the device operating parameters of the transistor can give you the lambda. because Gds = 1/r0 , where r0= 1/ (lambda*Id).
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top