LOW noise amplifier power supply requirments.
IdiotFromBeerSheva , 07-17-2022, 12:06 AM
Dear friends,
I am trying to design a power supply for this LOW NOISE AMPLIFIER. Everyone is saying that this LNA requires a separate power supply that is not connected to any other load but this LNA.
This is my LNA:
https://www.skyworksinc.com/-/media/...E12F665D2E.pdf.
Do you have actual numbers, reference design or any other document that discusses this issue?
Thank you.
qdrives , 07-18-2022, 03:58 PM
Any switching device will draw varying currents from a power supply. That in turn will be seen as noise in the output. The amount that gets to the output is defined by the PSRR.
Now you add a dedicated power supply for this LNA, but if it bad in noise, it will be no better than sharing it with other devices.
Best to read and watch a lot of Steve Sandler documents on power supplies. Low noise power supplies and flat impedance.
robertferanec , 07-22-2022, 08:41 AM
In these cases I normally use a small LDO to power critical analogue chip / component. But, I am not an expert for sensitive or analogue circuits.
IdiotFromBeerSheva , 07-24-2022, 12:58 PM
Thank you friends. I think I will use Robert's advice.
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