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In most cases a comparator is implemented using a dedicated comparator IC, but op-amps may be used as an alternative. Comparator diagrams and op-amp diagrams use the same symbols. A simple comparator circuit made using an op-amp without feedback simply heavily amplifies the voltage difference between Vin and VREF and outputs the result as Vout.
An op amp without negative feedback (a comparator) The amplifier's differential inputs consist of a non-inverting input (+) with voltage V + and an inverting input (−) with voltage V −; ideally the op amp amplifies only the difference in voltage between the two, which is called the differential input voltage.
Low-power, wide-supply-range dual op-amps [18] LM392 Low-power dual op-amps and comparator [19] LM432 LM358, LMV431 Dual op-amps with fixed 2.5 V reference [20] LM611 Op-amp with an adjustable voltage reference [21] LM614 Quadruple op-amps with an adjustable voltage reference [22] LM675 Power op-amp with a maximal current output of 3 amperes ...
Comparators are closely related to operational amplifiers, but a comparator is designed to operate with positive feedback and with its output saturated at one power rail or the other. If necessary, an op-amp can be pressed into service as a poorly performing comparator, but its slew rate will be impaired.
where Z dif is the op-amp's input impedance to differential signals, and A OL is the open-loop voltage gain of the op-amp (which varies with frequency), and B is the feedback factor (the fraction of the output signal that returns to the input). [3] [4] In the case of the ideal op-amp, with A OL infinite and Z dif infinite, the input impedance ...
Schmitt triggers are commonly implemented using an operational amplifier or a dedicated comparator. [nb 2] An open-loop op-amp and comparator may be considered as an analog-digital device having analog inputs and a digital output that extracts the sign of the voltage difference between its two inputs.
Figure 5: Op-amp differential amplifier. An operational amplifier, or op-amp, is a differential amplifier with very high differential-mode gain, very high input impedance, and low output impedance. An op-amp differential amplifier can be built with predictable and stable gain by applying negative feedback (Figure 5).
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