Diode Clamping Protection Circuit

Clamping can be used to adapt an input signal to a device that cannot make use of or may be damaged by the signal range of the original input. Applications of transient voltage suppressor diode can be found in data and signal lines microprocessor and mos memory acdc power lines and telecommunication equipments.

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Figure 4 shows an amplifier that implements a stacked diode protection scheme.

Diode clamping protection circuit. The main purpose of a voltage suppression circuit is to clamp the voltage to a safe level. Movs are best suited for protection on bidirectional ac power supplies while zener diodes are best suited for smaller low energy dc supplies. It contains a diode d and a capacitor c as are contained in a negative clamper.

The most common form of voltage clamping devices are metal oxide varistors movs and zener diodes. This makes transient voltage suppression diodes useful for protection against very fast and often damaging voltage transients. The positive clamping circuit moves the original signal in a vertically upward direction.

In this configuration the diode string is used to protect from negative transients. A positive clamping circuit is shown in the figure below. Thus the clamping diodes will start conducting current before the esd diodes do.

Clamping for input protection. The figure shown below can be modified into a positive clamping circuit by reconnecting the diode with reversed polarity. The circuit also has a great improvement in linearity at small input signals in comparison to the simple diode circuit and is largely unaffected by changes in the load.

The actual clamping occurs in roughly one picosecond but in a practical circuit the inductance of the wires leading to the device imposes a higher limit. The clamping diodes are 1n5177 schottky diodes because they have a forward voltage of approximately 04 v which is less than the forward voltage of the of the op amps input electrostatic discharge esd protection diodes. Diodes in clamping circuits a clamper circuit is used to shift or alter either positive or negative peak of an input signal to a desired level.

This circuit is also called as level shifter or dc restorer. Tvs diode is normally used for diversionclamping in low energy circuits and systems and for esd protection in circuits. The string of diodes are used to limit the leakage current in a usable input range but provide protection when the negative common mode range is exceeded.

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