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Because of the high maintenance needed to monitor and filter spammers from the RF Cafe Forums, I decided that it would be best to just archive the pages to make all the good information posted in the past available for review. It is unfortunate that the scumbags of the world ruin an otherwise useful venue for people wanting to exchanged useful ideas and views. It seems that the more formal social media like Facebook pretty much dominate this kind of venue anymore anyway, so if you would like to post something on RF Cafe's Facebook page, please do.

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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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