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The following circuit amplifies a voltage by a factor (R1 / R2). What is important in this circuit is that it amplifies by almost exactly (-R1 /R2) so that the gain of the circuit can be controlled precisely by controlling the resistor values precisely.
Inverting amplifier
Inverts and amplifies a voltage (multiplies by a negative constant)
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- Zin = Rin (because V − is a virtual ground)
- A third resistor, of value
 , added between the non-inverting input and ground, while not necessary, minimizes errors due to input bias currents. |
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