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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 does window comparator detect?
A window detector circuit, also called window comparator circuit or dual edge limit detector circuits is used to determine whether an unknown input is between two precise reference threshold voltages. It employs two comparators to detect over-voltage or under-voltage.
How many op amps do you need for a window comparator?
two op amps
You need two op amps to create a window comparator. One op amp is configured to produce positive output voltage only if the input is greater than the low reference voltage (VREF(LOW)).
What is the definition of a comparator in electronics?
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
What should the reference voltage be for the comparator?
Comparator Reference Voltages. In theory the comparators reference voltage can be set to be anywhere between 0v and the supply voltage but there are practical limitations on the actual voltage range depending on the op-amp comparator being device used.
How many resistors are needed for the comparator circuit?
As above, the voltage divider network provides a set of reference voltages for the individual op-amp comparator circuits. To produce the four reference voltages will require five resistors. The junction at the bottom pair of resistors will produce a reference voltage that is one-fifth the supply voltage, 1/5Vcc using equal value resistors.
Can a resistive voltage divider be used as a comparator?
Generally, a resistive voltage divider is used to set the input reference voltage of a comparator, but a battery source, zener diode or potentiometer for a variable reference voltage can all be used as shown.