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MLP - RF Cafe Forums
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gogober
Post subject: MLP
Unread postPosted: Thu Nov 25, 2004
1:35 pm
can some one explain me this circute,and why Rs>RL?
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Itay
Post subject:
Unread postPosted:
Thu Nov 25, 2004 3:03 pm
Greetings Gogober:
this circuit
is called L-Pad attenuator, and is used to match between 2 impedance
levels. The ratio doesn't have to be necessarily RL>RS, it can be
also RS>RL, all depends on the application. This attenuator is basically
derived from the T attenuator (with one of the series resistors is reduced
to value of 0-ohm). This attenuator is designed to have minimum attenuation
value.
You can calculate the resistor values of R1, R2 according
to the following formulas:
R1=SQRT( RS(RS-RL))
T2=SQRT
((RS*RL^2)/(RS-RL))
Good luck,
Itay
Posted 11/12/2012
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