Op amp Circuits Using Diode
Op amp Circuits Using Diode – Consider a diode as shown in the Fig. 2.68 (a) and the corresponding volt-ampere (V-I) characteristics in the Fig. 2.68 (b).
The basic volt-ampere relationship for a diode is given as,
It can be observed that at room temperature of 27°C i.e. T = 300°K, It can be observed that at room temperature of 27°C i.e. T = 300°K,
This value is frequently used in the diode circuits.
It can be seen from the V-I characteristics shown in the Fig. 2.68 (b) that for a forward biased condition, the diode voltage V is positive and the exponential term
has a positive index. Hence we can say that
This indicates, that the forward current increases exponentially with respect to the bias voltage V.
Taking natural logarithm of both sides,