I was thinking of using the AD8367 at 460 MHz.
My question is: which are the performance about OIP3 and OP1dB of amplifier at 460 MHz, when gain is around 23 dB (with 50 Ohm input and output impedance)?
You cannot load the input and output with 50 Ohms due to instability reasons, thus theAD8367 is loaded with 200 Ohms. OIP3 and OP1dB metrics are presented in dBV & dBm re:200 Ohms in plots Figure 9 and Figure 11in the datasheet.
thank you for reply.
In this discussion https://ez.analog.com/message/301767?commentID=301767&et=watches.email.thread#comment-301767 you have recommended me to use a transformer to convert 200 Ohm in 50 Ohm impedance.
I need to interface the component with other components that work at 50 Ohm, so I have decided to use the transformer.
Now, my issue is about using the VGA at 460 MHz, outside the frequency range reported into the datasheet.
Is it a good idea or should I use another VGA which works at 50 Ohm?
Thank you in advance.
The AD8367 will work at 460 MHz, however the linearity and noise will degrade as shown in the datasheet figures. If the AD8367 meets your OIP3, P1dB and NF at 460 MHz, then I would recommend using it provided that you are using the 4:1 transformers or equivalent matching.
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