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A differential amplifier is a type of electronic amplifier that amplifies the difference between two input voltages but suppresses any voltage common to the two inputs. [1] It is an analog circuit with two inputs and + and one output , in which the output is ideally proportional to the difference between the two voltages:
A fully differential amplifier (FDA) is a DC-coupled high-gain electronic voltage amplifier with differential inputs and differential outputs. In its ordinary usage, the output of the FDA is controlled by two feedback paths which, because of the amplifier's high gain, almost completely determine the output voltage for any given input.
Typical instrumentation amplifier schematic. An instrumentation amplifier (sometimes shorthanded as in-amp or InAmp) is a type of differential amplifier that has been outfitted with input buffer amplifiers, which eliminate the need for input impedance matching and thus make the amplifier particularly suitable for use in measurement and test equipment.
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An operational amplifier (often op amp or opamp) is a DC-coupled electronic voltage amplifier with a differential input, a (usually) single-ended output, [1] and an extremely high gain. Its name comes from its original use of performing mathematical operations in analog computers .
Three types of OTAs are single-input single-output, differential-input single-output, and differential-input differential-output (a.k.a. fully differential), [1] however this article focuses on differential-input single-output. There may be an additional input for a current to control the amplifier's transconductance.
A non-inverting amplifier is a special case of the differential amplifier in which that circuit's inverting input V 1 is grounded, and non-inverting input V 2 is identified with V in above, with R 1 ≫ R 2. Referring to the circuit immediately above,
A differentiator circuit (also known as a differentiating amplifier or inverting differentiator) consists of an ideal operational amplifier with a resistor R providing negative feedback and a capacitor C at the input, such that: is the voltage across C (from the op amp's virtual ground negative terminal).