From the course: Electronics Foundations: Semiconductor Devices
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Amplify signals
From the course: Electronics Foundations: Semiconductor Devices
Amplify signals
- [Instructor] As their name suggests, one of the primary uses for operational amplifiers is to amplify signals. And one of the simplest op amp configurations to do that, is the inverting amplifier. This configuration uses two resistors to provide divided feedback to the op amp, and it's called an inverting amplifier because the output signal will be negative, or a flipped version of the input signal and scaled by some amount. One of the resistors connects the input signal to the inverting, or negative op amp terminal, and I'll refer to that as, R in. The other resistor, R f, provides feedback from the output of the op amp back to the inverting input. The non-inverting, or positive op amp terminal, is simply connected to ground. The inverting amplifiers closed-loop voltage gain, which is the ratio of its output voltage, divided by the input voltage, is equal to negative R f over R in. R f and R in are both fixed values…
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