Problem about LNA Simulation in ADS

Hi all,

I did a LNA simulation using ADS.I met such problem:

When I simulate such topology shown in the attachment 1.jpg, the simulation is ok.
But when I add a capacitor in the input port (shown as 2.jpg), the simulator reminds that Node '_net1340' has no DC path to ground and it doesn't work.I do not know what's the reason,who can help me to solve it? Thanks!

B&R[/list]

hi dopradar!

The node is floating since no dc path exist's there. The node after the input port is only connected with caps.
So I suggest you to add a resitor (say 1G) in parallel to C3.

If not, the simulator is unable to find a dc solution and cannot continue simulating your transient simulation.

yes, this could be a notorious problem for ads

suggest using a large resistor forming a DC path

Hi, But I just do the S-Parameter Simulation.This problem take place in the S-parameter simulation.and the problem is, when I simulate as the 1.jpg topology,that's ok.when I added the capacitor C4 shown as 2.jpg, the simulator gives that error!

Thanks!

PS:
Thank you!

I have solved this problem as you suggest me!

dear dopradar
could upload your.jpg again , as it seems to me that the link is bad and pops up : the file doest exit
3x
kaka

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