OP Amp
What is an OP amp?
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An operational amplifier (often op amp or opamp) is usually depicted in circuit diagram problems as a triangle.
An amplifier takes an incoming electronic signal, and outputs a larger version of that same signal. An OP amp (operational amplifier) is a type of amplifier with two inputs (one positive and the other negative), an output, and two power supplies (one a positive voltage, and the other negative). It is usually depicted as a triangle in circuit diagrams.
The word Op-amp implies specific properties:
- High gain where ~ $$A=10^5\leftrightarrow 10^6$$
- Used in feedback circuits
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Differential inputs (two wire inputs as opposed to single wire)
- $$v_{out}=Gain\times (v^{+}-v^{-})=A\times v_{in}$$
- The input current is typically zero ( $$i=0)$$
In essence, it is a differential amplifier with really high gain. The Op-amp physically is a complex design typically comprised of ~50 transistors, resistors, and sometimes capacitors. However, knowing that input current = 0, and
$$v_{out}=A\times v_{in}$$
, we can solve most circuit problems.
An amplifier takes an incoming electronic signal, and outputs a larger version of that same signal. An OP amp (operational amplifier) is a type of amplifier with two inputs (one positive and the other negative), an output, and two power supplies (one a positive voltage, and the other negative). It is usually depicted as a triangle in circuit diagrams.
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