Help: how to define capacitive port in SpectreRF or ADS??

Status
Not open for further replies.
L

Learn2Fly

Junior Member level 3
Joined
Apr 26, 2005
Messages
25
Helped
0
Reputation
0
Reaction score
0
Trophy points
1,281
Activity points
1,534
define capacitive

Hi, all,

With the trend of integration, sometimes we do not need 50ohm ports block by block. For example, the LNA's output impedance and the mixer's input impedance do not have to match to 50ohm, if they can be ac coupled on-chip.

Therefore, here's my question: when the LNA's load is not 50ohm, but capacitive ( which varies with the sweeping frequency), how to define such a port in the RF simulators??

Thank you in advance.

L2F
 

port in spectrerf

In ADS , port component will accept complex impedances.

Put Z=R+(-) jX value in "Port Impedance" field.

If you would change your imaginary part of your impedance simply write a equation like...

Z=R+j*2*pi*freq*L or Z=R-j*(2*pi*freq*C)^-1

ADS accepts equations in component definition fields.

Spectre also accepts but depending on version.In 5.141 "port" component has a reactance field.
 

Status
Not open for further replies.

Similar threads

Menu
Log in
Register
Cookies are required to use this site. You must accept them to continue using the site. Learn more…