Diode Voltage Clipping Circuits

We’re already discussed the PN junction in a previous post. Let’s explore some of the applications of the PN diode.

diode2

It was already discussed that due to the nature of the PN junction, current is only allowed to flow in one direction. This results in two possible scenarios using a diode, depending on the direction it is facing with respect to the source.

diode1

Diode Clipping Circuits

Diodes in a forward bias allow current to pass, but thereby reducing the voltage level. In a reverse bias, current is stopped but the voltage remains unaffected.

Diode clipping can be done for either the positive or the negative voltage of a sinusoidal (or analog) input voltage. In order to clip both the positive and negative sides of the input voltage, two diodes are needed.

Positive voltage clipping:

d1

Negative voltage clipping:

d2

Two Diodes:

d3

If 0.7 Volts is not the desired output clipping voltage, a bias voltage can be added in each situation above.

d4d5