| Electronics > Beginners |
| Exponential Amplifier |
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| 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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