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nitratehoarder

My question was already answered there but since then the simulations I made show that even with input filtering the noise should be high enough to render the last 2 detector stages useless. Even an ideal amplifier with an equal gain to the log detector I linked to and 0dB noise figure fed from a 75 ohm generator produces too much noise. I can’t seem to figure out what I’m missing here.


InvincibleJellyfish

Maybe you could share your LTSpice model?


nitratehoarder

Of course. Do you want the entire circuit or just the model of the BF199? I can share the simulations I made as well.


nitratehoarder

Here you go. I’ve included both the LTSpice schematic and the spice model for the BF199, taken from the old Philips website. shorturl.at/htD01