Electronics > Beginners
Exponential Amplifier
exe:
--- Quote from: eev_carl on July 25, 2018, 01:21:05 pm ---Here is my schematic and test results.
--- End quote ---
Imho this can't work. But even if does, it's just wrong. Diode is biased only by opamp's parasitic input current, that's not how to build circuits.
eev_carl:
--- Quote ---Imho this can't work. But even if does, it's just wrong. Diode is biased only by opamp's parasitic input current, that's not how to build circuits.
--- End quote ---
What do you think about the anti-log schematics in the TI links posted above? Are you suggesting that the diode should be replaced with a BJT?
Alex Nikitin:
--- Quote from: eev_carl on July 25, 2018, 01:21:05 pm ---Hi,
I built the exponential amp w. a single diode. Here is my schematic
--- End quote ---
:palm: :palm:
Your schematics is wrong. It is not what you've built and measured.
Cheers
Alex
eev_carl:
--- Quote ---Your schematics is wrong. It is not what you've built and measured.
--- End quote ---
That's my bad Eagle skills...fixing + to ground
(replaced incorrect Eagle schematic with handdrawn schematic showing the inverting amp)
exe:
--- Quote from: eev_carl on July 25, 2018, 01:33:15 pm ---What do you think about the anti-log schematics in the TI links posted above? Are you suggesting that the diode should be replaced with a BJT?
--- End quote ---
Ah, now I see the updated schematics :). I'd say, if diode works for you, then don't make your life harder with more complicated circuits. Just know limitations of your solution (mainly thermal drift).
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