A non-inverting amplifier is a basic operational amplifier (op-amp) configuration used to amplify an input voltage while maintaining the same polarity. It provides positive feedback, meaning the output signal is in-phase with the input signal. This type of amplifier has high input impedance and low output impedance, making it suitable for various applications, such as signal conditioning and buffering.
The basic schematic of a non-inverting amplifier is as follows:
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+Vcc + Vin
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R1 |
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+ ---(+)--->(Vout)--|--> Output
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R2 |
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GND -Vin
Here:
Vin is the input voltage to be amplified.
Vout is the output voltage.
R1 is the input resistor.
R2 is the feedback resistor.
+Vcc and GND are the positive and ground power supply connections, respectively.
The voltage gain (A) of the non-inverting amplifier can be calculated using the following formula:
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A = 1 + (R2 / R1)
Where:
R1 is the resistance of the input resistor (connected between the input and the inverting terminal of the op-amp).
R2 is the resistance of the feedback resistor (connected between the output and the inverting terminal of the op-amp).
The gain calculation is straightforward, and the result will always be greater than 1, indicating the amplification of the input signal. The larger the ratio of R2 to R1, the higher the voltage gain of the amplifier. It's worth noting that non-inverting amplifiers have a relatively high input impedance, which means they won't load the input signal source significantly.