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Is there any way to amplify a signal with a voltage close to the GND level?

There are three ways to amplify a signal close to the GND level with an op-amp:

1.Applying positive and negative voltages to VDD and VSS respectively and treating GND as the midpoint potential (Figure 1)

2.Dividing the supply voltage with a resistor divider and applying the divided voltage to the noninverting input, IN(+), of a single-supply op-amp (Figure 2)

3.Using an Input and Output (I/O) rail-to-rail op-amp

The first method requires a negative power supply, and the second method requires additional external components.

An I/O rail-to-rail op-amp can amplify an input signal that swings from GND to VDD without using either a negative power supply or external components.

However, the I/O rail-to-rail op-amp cannot provide an output signal exceeding the GND-VDD range.

Figure 1 Example of a noninverting amplifier with positive VDD and negative VSS
Figure 1 Example of a noninverting amplifier with positive VDD and negative VSS

Figure 2 Example of a single-supply noninverting amplifier
Figure 2 Example of a single-supply noninverting amplifier

To view a list of I/O rail-to-rail I/O op-amps, click the following link:
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