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Design >> RF Design >> saturated operation of LNA
https://designers-guide.org/forum/YaBB.pl?num=1490596119

Message started by ezekiel1983 on Mar 26^th, 2017, 11:28pm

Title: saturated operation of LNA
Post by ezekiel1983 on Mar 26^th, 2017, 11:28pm

Part in discussion :TQP3M9007
Area of doubt :saturated operation of LNA

If a combined signal of 1616 Mhz 18 dbm CW along with -130dbm 1575 Mhz CW is being given at the input of the part in discussion fed with a 5 volt supply
1. What gain could I get for the 1575 component?
2. Is the compression after p1db based on attack release method ,in which case please provide attack and release time .
3. If not and it is based on instantaneous power (soft clipping) then is the understanding correct that the o/p slowly starts clipping towards a square wave waveform with rounded edges and as power level goes high from about 12.5dbm input it goes more squarer .in which case I may not reproduce (the phase ,frequency info )the 1575 correctly as during the squarer part of the o/p waveform there isn’t any 1575 information making through .The 1616 component will still pass through the frequency and phase information with some degradation on the amplitude information.
4. Will the LNA take time to regain its active operation from a saturated state ?if yes how much in my case ?
5. Can you please explain the saturation mode operation little detailed for the above part ?

Regards
Eze