What are differential amplifiers?????

1. A differential amplifier is a type of electronic amplifier that multiplies the difference between two inputs by some constant factor (the differential gain).<br />The inverting and non-inverting inputs are distinguished by quot;
−quot;
and quot;
+quot;
symbols (respectively) placed in the amplifier triangle. Vs+ and Vs− are the power supply voltages; they are often omitted from the diagram for simplicity, but of course must be present in the actual circuit.<br />Differential amplifiers are well-known electronic devices for amplifying a voltage difference between two input signals<br />Differential amplifiers are utilized to amplify, and produce an output signal which is a function of the difference between two differential, or complementary, input signals and to thereby enable the detection of relatively weak signal levels while inherently rejecting noise common on the differential input lines.<br />Differential amplifiers are used to amplify analog, as well as digital signals, and can be used in various implementations to provide an output from the amplifier in response to differential inputs.<br />