Simulating PA supply pin input impedance

Status
Not open for further replies.
V

viperpaki007

Full Member level 5
Joined
Jul 2, 2008
Messages
274
Helped
11
Reputation
22
Reaction score
8
Trophy points
1,298
Location
Finland
Visit site
Activity points
3,437
Hi,

Can anybody tell how i can simulate class-B PA input impedance at DC-power supply node.

regards
 

viperpaki007 said:
... input impedance at DC-power supply node.
Click to expand...

I'd try it this way:

1. Connect the power supply to the PA power supply input via a huge series inductance (e.g. 100H), to get rid of the power supply's impedance
2. adjust the operating point and input/output behaviour of your PA to the conditions at which you want its power input impedance
3. insert a unit (1A) ac source in parallel to the PA's power supply input node
4. run an ac analysis
5. plot the ac voltage at this power supply node vs. frequency.

This is the input impedance at this node (V≙Ω) at the adjusted I/O conditions of your PA, because the parallel impedance of the power supply is much larger due to the serial inductance, at least for frequencies of your interest.
 
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…