Why are comparators useful?

A comparator circuit compares two voltages and outputs either a 1 (the voltage at the plus side; VDD in the illustration) or a 0 (the voltage at the negative side) to indicate which is larger. Comparators are often used, for example, to check whether an input has reached some predetermined value.

What is the advantage of using comparators with hysteresis?

For example, a comparator may distinguish between a high temperature and a normal temperature condition. Also, signal or noise variations at the comparison threshold can create multiple transitions. Therefore, hysteresis sets a lower and an upper limit to eliminate the numerous shifts or transitions created by noise.

What are the characteristics of comparators?

Characteristics of Good Comparators:

• It should be compact.
• It should be easy to handle.
• It should give a quick responses or quick results.
• It should be reliable, while in use.
• There should be no effects of the environment on the comparator.
• Its weight must be less.
• It must be cheaper.

What are the advantages of op-amp based voltage comparator?

The advantage of positive feedback is that the resulting comparator Schmitt trigger circuit is immune to erratic triggering caused by noise or slowly changing input signals within the hysteresis band producing a cleaner output signal as the op-amp comparators output is only triggered once.

Why are comparators useful testing utilities?

The test comparator is a useful feature for seeing exactly what the error is in a test failure. First, you should run a test file or test suite. Then select one of the test failures: this should show the expected and actual results in the test report.

What are the applications of voltage comparators?

Comparators can also be used as window detectors. In a window detector, a comparator is used to compare two voltages and determine whether a given input voltage is under voltage or over voltage.

What is hysteresis in electrical circuits?

hysteresis in Electrical Engineering (hɪstərisɪs) noun. (Electrical engineering: Circuits, Electrical power) Hysteresis is something that happens with magnetic materials so that, if a varying magnetizing signal is applied, the resulting magnetism that is created follows the applied signal, but with a delay.

Why positive feedback is not used in amplifier?

Positive Feedback Both the input signal and feedback signal introduces a phase shift of 180o thus making a 360o resultant phase shift around the loop, to be finally in phase with the input signal. It is because of these disadvantages the positive feedback is not recommended for the amplifiers.

What are the advantages of pneumatic comparators?

Advantages of pneumatic comparator It is very accurate and precise. High magnification up to 30000: 1 is possible in a pneumatic comparator. Since indicating device and measuring head are placed at different places, there is no interference. They are self-cleaning because a jet of air helps in cleaning the workpiece.

What are the advantages and disadvantages of comparators?

(i) The electrical comparators have got small number of moving parts. two or more magnifications. Thus the same instrument can be used for various ranges. ‘(iii) The mechanism carrying the pointer is very light and not sensitive to vibrations.

What is the advantage of mechanical comparator over others?

What is the advantage of mechanical comparator over others? Explanation: Mechanical comparator is cheaper as compared to others. Mechanical comparators have more moving parts due to this friction is more and accuracy is less. External supply is not required.

What is the purpose of a comparator in op amp Mcq?

A comparator is a circuit, which compares a signal voltage on one input of an op-amp with a known reference voltage on the other input.

What are the advantages of using an electrical comparator?

The electrical comparators have a small number of moving parts hence high accuracy can be achieved. It is possible to get a very high magnification and the same instrument may have two or more magnifications, thus the same instrument can be used for various ranges.

What is the working principle of an electronic comparator?

The working principle of this electronic comparators is something similar to the electrical comparators. but in electrical we use galvanometer as the magnifying system, in electronic comparators, we will use frequency modulation as the magnifying system.

Can comparator be used as an absolute measuring device?

They will be shown only the deviation in size, during the measurement, a comparator is able to give the deviation of the dimension from the set dimension. It cannot be used as an absolute measuring device but can only compare two dimensions.

What are the factors affecting the accuracy of comparator?

Accuracy of the comparator mainly depends on the accuracy of the rack and pinion arrangement. Any slackness will reduce accuracy. It has more moving parts and hence friction is more and accuracy is less. The range of the instrument is limited since pointer is moving over a fixed scale.