From the course: Electronics Foundations: Semiconductor Devices
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Buffer signals
From the course: Electronics Foundations: Semiconductor Devices
Buffer signals
- [Instructor] One of the simplest op-amp circuits that utilizes feedback is called a voltage follower. It's created by simply connecting the output of the op-amp directly back into the negative inverting input terminal. The input signal for the voltage follower goes into the non-inverting or positive terminal. And the output signal is simply the output from the op-amp. The reason this circuit is called a voltage follower is because the output voltage follows or matches the input voltage. Since the output voltage is the same as the input voltage, the voltage follower circuit has a constant gain of one. You'll often hear that referred to as unity gain which means that the signal passing through the circuit is neither amplified, nor attenuated. At first glance, a circuit that outputs the same voltage signal that you put into it they may not seem very useful, but even though the input and output voltage is the same, this circuit…
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