Diode Resistance Levels (AC Resistance and Average)

• small change in AC the diode current change rapidly and the operating point will move
• when Vd increase the operating point Q will move upward (maximum voltage and maximum current)
• when current and voltage starts decreasing and the operating point will move downward (voltage and current is equal to zero)
• the average ac resistance is the resistance determined by a straight line drawn between the two intersections obtained by the maximum and minimum values of input voltage
• In general, therefore, the lower the Q-point of operation (smaller current or lower voltage) the higher the ac resistance.
• As with the dc and ac resistance levels, the lower the level of currents used to determine the average resistance the higher the resistance level
• DC or static


  Defined as a point on the characteristics
• AC or dynamic


  Defined by a tangent line at Q-point
• Average ac


  defined by a straight line between limits or operation