comparator Definition and Topics - 5 Discussions

In electronics, a comparator is a device that compares two voltages or currents and outputs a digital signal indicating which is larger. It has two analog input terminals




V

+





{\displaystyle V_{+}\,}
and




V







{\displaystyle V_{-}\,}
and one binary digital output




V


o






{\displaystyle V_{\rm {o}}\,}
. The output is ideally





V


o



=


{



1
,




if



V

+


>

V








0
,




if



V

+


<

V












{\displaystyle V_{\rm {o}}={\begin{cases}1,&{\mbox{if }}V_{+}>V_{-}\\0,&{\mbox{if }}V_{+}<V_{-}\end{cases}}}
A comparator consists of a specialized high-gain differential amplifier. They are commonly used in devices that measure and digitize analog signals, such as successive-approximation ADCs, as well as relaxation oscillators.

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  1. akaliuseheal

    Reading datasheets to pick a comparator

    Hello, I've got a voltage comparator, well only on schematics, I need to chose one and I need some help interpreting datasheet. The datasheet I was looking at is of a lm393. My input voltage ranges from -7.8V to +7.8V. The datasheet says -0.3 to something. So it's not usable, right? I was also...
  2. akaliuseheal

    Hysteresis of a voltage comparator

    Hello, I am designing a circuit which basically takes two voltages (V1,V2) and based upon which one of the two is greater, turns corresponding LED. So, I have got to the part where I have output from differential op amp that is the input of the inverting voltage comparator with hysteresis...
  3. A

    Window Comparator Question

    So I've been reading an intro book to electronics and I got to a section about operational amplifiers. It talks about different uses of them and how they can be used as comparators. It then talks about a specific comparator called a window comparator which will output a positive voltage if the...
  4. ichabodgrant

    Comparator design using a 4-bit adder

    Homework Statement Hi, it's me again. Now I am going to design a 4-bit magnitude comparator using just ONE 4-bit adder and infinitely large number of gates (AND, OR, NOT, NAND, NOR, XOR, XNOR) for signed numbers (negative binary). Homework Equations A > B => A3barB3 + A2barB2x3 +...
  5. ichabodgrant

    Op-amp as a comparator (analog-to-digital conversion)

    Homework Statement Okay, This time it's an exam question. I am doing some past papers and there are questions about comparators which are not introduced in this course (this course is preliminary course for engineering students who are interested in electrical, electronic or computer...
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