Consider the circuit shown below. Assume that the op-amp is ideal.
fa2014_fn_diode_opamp2.png
Figure 3-1
The diode has the following I-V characteristics: iD=Is*(e^(vD/vth)-1)
where iD is the current through the diode,( Is ) is the reverse bias saturation current Vd is the voltage across the diode, and
Vth is the thermal voltage.
Derive the expression for the output voltage, Vout
, in terms of one or more of the variables Vin,R1 ,R2 , Is, and Vth .
.Vout=
so far I got =Vth ln(Id/Is +1)
Id cannot be right.
1 answer