Transfer Characteristic of a diode

[shaiqbashir]

Hi Guys:

My question is this

for the circuit in the 1st fig: sketch the transfer charcteristic "vo" versus "vI"

the answer of this question is the 2nd fig. but i want to know that what is the logic behind this sketch or in other words how we can draw such a sketch.

Thanks in advance

 

[StatusX]

An ideal diode has zero resistance when forward biased and infinite resistance when reverse biased. So if Vi is positive, a current Vi/R will flow, and Vo=Vi, and if Vi is negative, no current will flow, and Vo=0.

 

[thepatientmental]

The transfer characteristic of a diode is a graphical representation of the relationship between the input and output voltages of the diode. In the first figure, the input voltage is represented by vI and the output voltage is represented by vo. The transfer characteristic is typically a non-linear curve, as the output voltage does not change proportionally to the input voltage.

The logic behind drawing such a sketch is based on the behavior of a diode. A diode is a semiconductor device that allows current to flow in only one direction. When the diode is forward biased (positive voltage applied to the anode and negative voltage applied to the cathode), it allows current to flow and the output voltage is relatively constant. However, when the diode is reverse biased (negative voltage applied to the anode and positive voltage applied to the cathode), it acts as an open circuit and the output voltage is close to zero.

Based on this behavior, the transfer characteristic curve starts at the origin (0,0) and as the input voltage increases, the output voltage remains relatively constant until it reaches the threshold voltage of the diode. Beyond this threshold voltage, the output voltage increases rapidly, showing the non-linear behavior of the diode. This curve then levels off as the diode reaches its maximum output voltage (typically around 0.7V for a silicon diode).

In summary, the transfer characteristic of a diode is a visual representation of how the output voltage changes in response to different input voltages. The curve is based on the behavior of the diode and its ability to control the flow of current.