to find stability of RF amplifier

anyone knows exactly how to locate LC or PI filters in order to find good stability to my transistor

Hi,

Are you trying to stabilise your transistor under DC conditions? if thats the case then you need to introduce the real loss to the transistor rather than frequency dependant network.

I hope its helpful.

regards,

yes i am trying DC bias to my RF Power Amplifier
Real loss would u like to explain little bit

Real loss means resistive loss that are not frequency dependent as long as you can compensate for the parasitics of the resistor, there is plenty of material available on this subject. try reading about stabilizing RF FETs by using resistive networks etc.

where is your transistor is not stable ?
if it "in band" you must put resistor (try first at the output network)
if it out of band , at higher freq put plr, and if it is at lower freq put prc

where can i find more information about plr and plc

plr = paralel resistor with coil
plc = paralel capacitor with resistor ( should be prc)