4.68 Using the exponential diode characteristic, show that for vs and v, both greater than zero, the circuit of Fig. 4.23(a) has the transfer characteristic vo = Us – Up (ati, = 1 mA) – V, In(v,/R)...

4.68 Using the exponential diode characteristic, show that
for vS and vO both greater than zero, the circuit of Fig. 4.23(a)
has the transfer characteristic
vO
= vS
−vD

at iD
=1 mA

−VT ln

vO/R

where vS and vO are in volts and R is in kilohms. Note that
this relationship can be used to obtain the voltage transfer
characteristic vO vs. vS by finding vS corresponding to various
values of vO.

Extracted text: 4.68 Using the exponential diode characteristic, show that for vs and v, both greater than zero, the circuit of Fig. 4.23(a) has the transfer characteristic vo = Us – Up (ati, = 1 mA) – V, In(v,/R) where vs and v, are in volts and R is in kilohms. Note that this relationship can be used to obtain the voltage transfer characteristic v, vs. v, by finding v, corresponding to various values of vo.


Extracted text: D (a) (+1