Why diodes are used in comparator using op-amp?
Why diodes are used in comparator using op-amp?
These two diodes are used to protect the op-amp from damage due to an increase in input voltage. These diodes are called clamp diodes as they clamp the differential input voltages to either 0.7V or – 0.7V. Most op-amps do not need clamp diodes as most of them already have built-in protection.
Why diodes are used in comparator?
Why clamp diodes are used in comparator? Explanation: The diodes protect the op-amp from damage due to excessive input voltage. Because of these diodes the difference input voltage of the op-amp is clamped to 0.7v or -0.7 v, hence these diodes are clamp diodes.
How does diode act as comparator?
Diode Comparator For example, the comparator output may consist of an abrupt departure from source quiescent level which occurs at the time the signal attains the reference level but is otherwise independent of the signal. Or the comparator output may be a sharp pulse which occurs when signal and reference are equal.
What is a diode comparator?
Comparator is a circuit which performs comparison between the signal voltage on one input of Op-amp with reference voltage on another input. The arrangement of diodes in comparator circuit is in such a way that they play a cardinal role in protecting Op-amp from getting damage due to excess of input voltage.
What types of circuits use comparators?
Op-amp window comparators are a type of voltage comparator circuit which uses two op-amp comparators to produce a two-state output that indicates whether or not the input voltage is within a particular range or window of values by using two reference voltages. An upper reference voltage and a lower reference voltage.
What are the diodes D1 & D2 used in comparator circuit usually refer to?
The above circuit diagram shows the diodes D1 and D2 . These two diodes are used to protect the op-amp from damage due to increase in input voltage. These diodes are called clamp diodes because they clamp the differential input voltage to either 0.7V or -0.7V . Thus option 2 is correct.
How does op-amp comparator work?
The open-loop op-amp comparator is an analogue circuit that operates in its non-linear region as changes in the two analogue inputs, V+ and V- causes it to behave like a digital bistable device as triggering causes it to have two possible output states, +Vcc or -Vcc.
What is op-amp comparator?
What is the purpose of comparator?
A comparator is used to compare a measurable quantity with a reference or standard such as two voltages or currents. It outputs a digital signal showing the results.
