log amplifier with diode
dc sweep log scale linear
Vout = -Vt*ln(Vin/(Is*R)), Is saturation current of diode.
log amplifier with transistor
dc sweep log scale linear
exponential amplifier
linear scale exponential
Vout ~ -R*Is*exp(Vin/Vt).
full wave rectifier
~1.4v drop across diodes
pricision rectifier
rectifier with no voltage drop on diode
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