zachi said:Hi ...
I want to build a 30 dB RF amplifier for VHF range (from -40dBm to -10dBm), so I use two stages of 15dB CE transistor amplifier(BF199) .
Every stage work great @ 200MHz , but when I connect them together..the signal is distorted !!!!!!!!
I try to connect many capacitors (1p - 1mm) between them, but I get the same results.
If I connect them, and check @ 50 MHz - they work great and I get more then 30 dB gain.
what is the best way to solve this issue :?:
Thanks in advance,
You spoke about the gain, but what about the P1dB? You are sure you optimized the P1dB? And what about the matching network (input and output i mean)?Vulcan said:hey all....
i'm zachi's partner working with him on the same project.
We used the RF Generator to give us a -30dBm @ 200MHz as an input test signal.the Output was measured using a spectrum analyzer.
after playing with the values of the resistors and capacitors, we got the following configuration (Schematics Attached) which gave us the best results, meaning a 10-15dB Gain.
but when we connected a second stage (cascaded two amp) the reading on the spectrum analyzer showed Loss instead of Gain.
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