"Op Amp" is an abbreviation for operational amplifier. Ideally, this is a differential amplifier with the following characteristics:
- Gain: infinite
- Input impedance: infinite
- Output impedance: 0
- Delay from input to output: 0
By negative feedbackNote application, it can be used as an amplifier and for various types of analog signal processing (addition, subtraction, differentiation, integration, etc.).
[Operational amplifier description]
Represented as a triangle, comprises a total of 5 pins, as follows: + input (VN: non-inverting input => This means that the polarities of the applied input signal and the signal obtained as the output are identical), - input (VI: inverting input: This means that the polarities of the applied input signal and the signal obtained as the output are exactly the opposite (-180°)), output (VO), and power supplies (V+, V-).
The most common usage example is that of an amplification circuit, as follows.
In this example, the input signal is amplified by (1 + R2/R1) times.
If R1 = 1 kΩ and R2 = 10 kΩ, the amplifier will have a gain of x11.
Therefore, the gain can be freely set simply by changing the resistance value. In the above circuit, the signal is being input via the + pin, so the input and output are in-phase (non-inverting amplifier); however, if the signal is input on the R1 side, the output is inverted (inverting amplifier).
Note Negative feedback means the output signal is fed back to the - input via a resistor, capacitor, diode, or transistor connected between the output and - input.
|USB3.0 Host Controller|
|USB2.0 Host Controller|