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A circuit diagram of a comparator made using an operational amplifier. = {+ > < Date: 26 January 2009 ... flipped op amp: 04:13, 26 January 2009: 200 × 60 (20 KB ...
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.
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 ...
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 [23] LM709 Yes General-purpose op-amp [24] LM741 LM709
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.
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Date/Time Thumbnail Dimensions User Comment; current: 21:57, 17 October 2011: 832 × 514 (30 KB): Ea91b3dd: Fixed subscript since thumbnail generator doesn't do percentage font sizes.
A zero crossing detector is a comparator with the reference level set at zero. It is used for detecting the zero crossings of AC signals. It can be made from an operational amplifier with an input voltage at its positive input (see circuit diagram) [clarification needed].