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Question

The diodes D1 and D2 used in the comparator circuit usually refer to ______?


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Solution

Explanation:

  1. A comparator is a circuit that compares a signal voltage on one of an operational amplifier's inputs to a known reference voltage on the other input.
  2. The diodes D1 and D2 given in the circuit diagram below are clamp diodes. These diodes are used to protect the operational amplifier from damage due to an increase in the input voltage.

Clamp diodes:

  1. Clamp diodes could be utilized as a level shifter or perhaps to protect equipment from transitory voltages or fluctuations.
  2. A clamp diode consists of a diode that conducts electric current in only one direction and prevents the signal from exceeding the reference value and a capacitor that provides a DC offset from the stored charge.
  3. These diodes are called clamp diodes as they clamp the differential input voltages to either 0.7Vor-0.7V.

Therefore, the diodes D1 and D2 used in the comparator circuit are usually referred to as clamp diodes.


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