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pi vs tee

P

Phil Newman

Jan 1, 1970
0
Can anyone tell me the advantages of an RF pi-network over a tee-network for
a low noise amplifier design?

i decided to choose a pi network to design mine, and want to justify my
decision, rather than saying "it looked nicer"

any help would be appreciated

phil
 
D

Don Pearce

Jan 1, 1970
0
Can anyone tell me the advantages of an RF pi-network over a tee-network for
a low noise amplifier design?

i decided to choose a pi network to design mine, and want to justify my
decision, rather than saying "it looked nicer"

any help would be appreciated

phil
Assuming you are talking about LC matching structures, the big
difference is the out-of-band impedance. For the PI network it will be
low at high frequencies, while for the TEE network it will be high. In
band they can both be made to perform identically.

d

_____________________________

http://www.pearce.uk.com
 
P

Phil Newman

Jan 1, 1970
0
ah yes, knew i forgot something! the pi-nw i have has a parallel inducor,
then series inductor, then parallel capacitor

cheers for the answer

phil
 
R

Roy McCammon

Jan 1, 1970
0
Phil said:
Can anyone tell me the advantages of an RF pi-network over a tee-network for
a low noise amplifier design?

i decided to choose a pi network to design mine, and want to justify my
decision, rather than saying "it looked nicer"

any help would be appreciated

phil

I usually go for the fewest inductors.
 
J

John Popelish

Jan 1, 1970
0
Phil said:
Can anyone tell me the advantages of an RF pi-network over a tee-network for
a low noise amplifier design?

i decided to choose a pi network to design mine, and want to justify my
decision, rather than saying "it looked nicer"

any help would be appreciated

phil

Mathematically you can convert any T into a pi, or vice versa. You
usually pick the one that gives the lower cost, or more reasonable
component values.
 
P

Phil Newman

Jan 1, 1970
0
ok, thats great. thanks for the help guys

another question id like to ask (and I've asked it in a new link too)

is how to achieve broadband stability using these networks?

in my amplifier I have k > 1 between 10 and 14 GHz, which is the freq of
operation, but how can I increase this range?

I've added more resistance for stabilisation, but this will reduce gain.

I thought of resistively loading the bias network, which I don't have at
though mo, because I wasn't sure how to do that for a LNA.

any ideas?

phil
 
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