Analysis of Diode Circuits

Let the circuit indicated in the diagram. We desire to analyze this circuit to fine out the diode current I_D & voltage V_D.

Obviously the diode is biased in forward direction.

Supposing that V_DD is higher than 0.5V or therefore, the diode current will be much higher than I_s and we may represent i-v characteristics by the exponential relationship resultant in

                                                             I_D = I_s e ^V_D^/nV_T        (i)

The other factors that govern circuit operations is got by writing down a KVL equation resultant in

                                    I_D = (V_DD - V_D) / R ...(ii)

                                    if we put I_D=0 in equation (ii) we will obtain

                                                            V_DD = V_D

                                     if we put V_D = 0 we get

                                                                    I_D = V_DD  / R                                 

                                    We draw current beside Y-axis & voltage across X-axis