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Comparators draw peak currents during the time the output transitions. This is caused by the driving of the internal capacitance of the output stage gates. These peaks can be as high as 1000% or more of the quiescent current and lasts the duration of the output slew time.
Can comparators be used as op amps?
While operational amplifiers and comparators may look similar, they are very different and designed to be used in different applications as an op-amp may be used as a comparator, a voltage comparator can not be used as an op-amp due to its non-linear output stage.
What does a comparator do in a circuit?
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 a current comparator?
A current comparator is a simple current-mode signal processing circuit, which takes a difference current (Iin) as an input and produces a digital output voltage. If Iin flows into the circuit, Vout is high; If Iin flows out of the circuit, Vout is low [1].
What are the characteristics of comparator?
The characteristics of Comparator The important characteristic of comparator are. Speed of operation. The output of comparator must switch rapidly between the saturation level (+vsat or -Vsat) and also respond instantly to any change of condition at its input . Accuracy. Compatibility of output.
What type of circuits use comparators Mcq?
Explanation: A comparator is a combinational circuit that takes two numbers as input in binary form and results whether one input is greater, lesser or equal to the other input. Because, all the input is compared to each other, therefore it is possible only by using 1 circuit.
How does an amplifier act as a comparator?
An op-amp consists of two input terminals and hence an op-amp based comparator compares the two inputs that are applied to it and produces the result of comparison as the output.
Where are comparators used?
Comparators are used in central processing units (CPUs) and microcontrollers (MCUs). Examples of digital comparator include the CMOS 4063 and 4585 and the TTL 7485 and 74682. Note: An XNOR gate is a basic comparator, because its output is “1” only if its two input bits are equal.
What is the function of the comparators in the 555 timer circuit?
A comparator is a circuit element that compares two analog input voltages at its positive (non-inverting) and negative (inverting) input terminal. If the input voltage at the positive terminal is higher than the input voltage at the negative terminal the comparator will output 1.
Is the comparator is sequential or combinational circuit?
Comparator is a combinational logic circuit that compares the magnitudes of two binary quantities to determine which one has the greater magnitude.
What are comparators in metrology?
In Metrology, The comparator is a Precision Instrument, which is used to compare the dimensions of the given component with the actual working standard.
What is a Schmitt?
In electronics, a Schmitt trigger is a comparator circuit with hysteresis implemented by applying positive feedback to the noninverting input of a comparator or differential amplifier. It is an active circuit which converts an analog input signal to a digital output signal.
What is the function of the comparator in the ADC?
COMPARATOR BASICS A comparator is similar to an op amp. It has two inputs, inverting and non-inverting and an output (see Figure 1). But it is specifically designed to compare the voltages between its two inputs.
What are the advantages of comparators?
Advantages of Electrical Comparator: Vibrations are reduced due to least weight of mechanical. It consists of less moving parts. By AC supply the friction errors are reduced. For measuring units the indicating instrument can be held at remote locations.
What is comparator in VLSI?
A circuit that compares two binary words and indicates whether they are equal is called a comparator. Some comparators interpret their input words as signed or unsigned numbers and also indicate an arithmetic relationship (greater or less than) between the words. These devices are often called magnitude comparators.
How many types of digital comparators are?
There are two main types of digital comparators available: Identity comparator and Magnitude comparator.
Which of the following is comparator circuit?
Detailed Solution. Schmitt trigger acts as a comparator when the input voltage is greater than UTP then the output will change from –Vsat to +Vsat.
What are the advantages of pneumatic comparators *?
1) In Pneumatic Comparator, high magnification can be achieved. 2) The gauging member does not come into direct contact with the part to be measured and hence no wear and tear takes place on gauging member or the workpiece. 3) The measuring is very small and does not cause any harm to the workpiece.
What are the advantages of pneumatic comparators Mcq?
Explanation: In pneumatic comparator, there is no physical contact with setting gauge or part being measured. Due to this reason, there is no loss of accuracy due to gauge wear. It is an accurate, universal, reliable and speedy device.
What is the difference between a comparator and an amplifier?
The basic difference between the comparator and the amplifier is that the amplifier amplifies the input signal or changes its amplitude level with minimum distortion of original signal but the job of comparator is to compare the two signals and give the indicationt so that we can know which signal has more strength.
What are mechanical comparators?
Mechanical comparator is a measuring instrument and the mechanism of this instrument is in the form of tape spring twisted, and that is positioned in the middle part. The middle part of the mechanical comparator rotates through a fixed angle upon tension which is shown in the figure.
What is a differentiator circuit?
In electronics, a differentiator is a circuit that is designed such that the output of the circuit is approximately directly proportional to the rate of change (the time derivative) of the input. The differentiator circuit is essentially a high-pass filter.
How does comparator get high rate of accuracy?
How to obtain high rate of accuracy in comparator? Explanation: High voltage gain causes comparator output voltage to switch between saturation levels. High CMRR rejects noise at input terminal and input offset (voltage & current) help to keep changes in temperature variation very slight.
What is a comparator in research?
A comparator is an investigational or marketed product (active control) or placebo (inactive control) used as a reference in a clinical trial. Comparators are used in clinical trials to compare the efficacy of an investigational drug to the efficacy of an existing treatment.
How do you trigger a 555 timer?
Trigger: Pin 2 is the trigger, which works like a starter’s pistol to start the 555 timer running. The trigger is an active low trigger, which means that the timer starts when voltage on pin 2 drops to below one-third of the supply voltage. When the 555 is triggered via pin 2, the output on pin 3 goes high.
What value of reference voltage is set at the upper comparator in IC 555?
Reference voltage for the upper comparator is set as 2/3 of Vcc while that of the lower comparator as 1/3 Vcc. These reference voltages determines the timing cycle of the IC. 4. The reference voltage of the comparator can be changed by giving an external voltage to the control pin5.
Which among the following can be used to detect the missing heart beat?
5. Which among the following can be used to detect the missing heart beat? Explanation: A monostable multivibrator can be used as a missing pulse detector by connecting a transistor between trigger inputs.
