Op amp Circuits Using Diode

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).

Op amp Circuits Using Diode

The basic volt-ampere relationship for a diode is given as,

Op amp Circuits Using Diode

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,

Op amp Circuits Using Diode

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

Op amp Circuits Using Diode

has a positive index. Hence we can say that

Op amp Circuits Using Diode

This indicates, that the forward current increases exponentially with respect to the bias voltage V.

Taking natural logarithm of both sides,

Op amp Circuits Using Diode

 

Updated: November 17, 2017 — 10:22 am