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.

[SOLVED] Some questions about Momentum..

Status
Not open for further replies.

BigBoss

Advanced Member level 5
Joined
Nov 17, 2001
Messages
5,178
Helped
1,537
Reputation
3,074
Reaction score
1,390
Trophy points
1,393
Location
Turkey
Activity points
31,133
simulating in mw mode site:edaboard.com

I'm on a project that works at 1.9GHz what will be consisted of passive circuits on a silicon substrate.

I have some question in my mind about " differential ports"

These are compiled as single ports but when this the case , source impedance will be what ? I mean if they are recognized as a single port How I can simulate this "Data Set of Momentum" in a schematic simulation page? Because there are 11 ports and in Momentum simulation every single port is terminated by 50Ohm and in reality, these ports won't be terminated 50 Ohm , maybe some different terminations..

Second question..

How can we choose MW mode and RF Mode ? In fact in Reference Guide of Momentum the difference between them is not VERY clear..And obviously , the results seem to be different. But the worst is measurment is a little bit far away from simulation results.

In that case which simulation mode will be used in which case??

Is there anybody who has great exprience on ADS Momentum ? I'm gonna be appreciate.. :)
 

paparas

Junior Member level 1
Joined
Sep 11, 2002
Messages
18
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
67
You can terminate each single port to 100 Ohms or even better use an ideal transformer (lots of them in the included components of ADS).
Avoid using RF mode in momentum for it only provides a rough indication for the result (but it is much faster).

Always keep in mind when simulating passive structures on semiconductive substrate:
(i) for inductors the metalization layer for RFIC is quite thick compared to the substrate - read the very nice application notes of Agilent on the subject.
(ii)2.5D simulators like momentum do not provide very accurate results
for simulations with "thick" metals, try using a full 3d simulation package for cross checking

Glad if I was any help
 

borich_03

Full Member level 2
Joined
Oct 7, 2003
Messages
142
Helped
20
Reputation
42
Reaction score
6
Trophy points
1,298
Activity points
1,148
I compared results from Momentum's Microwave mode with results from CST for planar structures. And I had very good agreement between theirs.
 

Element_115

Advanced Member level 2
Joined
Mar 23, 2002
Messages
509
Helped
72
Reputation
144
Reaction score
43
Trophy points
1,308
Activity points
3,759
In Momentum (the Layout window) you can define each port real and imaginary. You go to "Momentum"-->"Port Editor..." and type in your value.
HP has a great tech support, if you get stuck they will help.
Hope this helps
 

Status
Not open for further replies.

Part and Inventory Search

Welcome to EDABoard.com

Sponsor

Top