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.

Register Log in

How can I get Gm for a MOSFET in ADS?

Status
Not open for further replies.
boy

boy

Advanced Member level 1
Joined
Sep 30, 2002
Messages
481
Helped
98
Reputation
196
Reaction score
58
Trophy points
1,308
Location
Thailand
Activity points
3,963
I have read some tutorials. I saw in the DC simulation controller that in Other, they can set something like M1.Gm to get Gm for the MOSFET but I dont know how to set it. Also in TSMC library, how can I get Gm, Cox, Tox for the MOSFET in ADS, thank you very much.
 

in @DS U can use a meas equation component
and gm=GM.mosfet1
mosfet 1 is the name of the transistor
or u can make it by using differentiation of IDs with respect to VGS

and about cox u can see the examples in RFIC , the vco with mos varactor there is a design using s parameter simulation to find cin of the mos

but tox , is a parameter of the technology i think for TSMC .18 it about 4nm
 

Thank you very much, it works, actually gm=M1.Gm :) BTW how can i know what parameters in the model that I can extract??? I have tried help but it does not say much about that. it seems to me that i can have something like, M1.xxx to get the paraneters but i wnat but i dont know how many and what xxx ??

About RFIC example, i run the schemetic Biased_FAT_CAP_Test, i saw the Cin, can i also use this for Cout?? Actualy, i would like to design a distributed amplifier. I wonder that can i use those Cin and Cout from that technique to get Cin and Cout for the distributed amplifier. thank you
 
i think u can do this for cout , as u calculte output imedance of the amp and the imaginary part is the capacitance

and also ask an experinced designer , he may know better
 

Sorry!
Attachment here
 
Plot Ids-Vds curves. To calculate gm, use the command
gm = diff(Ids) in the data display. This will give you the derivatice of Ids w.r.t. Vgs which is basically, gm.
 
choose Amplifier O' ADS design guide ,there is a templete to caculate the gm.
 

you must get some sense before your design

gm is the transconductance, just use to descrip the Ids v.s. Vgs!

so did simulation use dive...
 

Double click DC Pallete->Parameters Tab->check Detailed Device Operating point Level., then go to graph window, add a rectangular window and you finally see gm and someotheruseful intrinsic parameters.You can plot anything vs anything.Be careful with indepented vectors .Must be same and equal!!!
 

Status
Not open for further replies.

Similar threads

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Back
Top