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A voltage follower is a unity-gain, noninverting buffer that requires only an operational amplifier (and a decoupling capacitor). Voltage followers have high input impedance and low output impedance—this is the essence of their buffering action ....

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A voltage follower is an op-amp circuit whose output voltage straight away follows the input voltage. i.e. output voltage equivalent to the input voltage. The Op-amp circuit does not provide any amplification thus, its voltage gain is unity..

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Voltage-Feedback operational amplifiers (VFA op amps) allow circuit designers to swap gain for bandwidth. current-feedback op amps (CFAs) are simpler to use than VFAs, but do not offer gain-bandwidth tradeoffs, and have poorer slew rates.

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The op-amp can be considered to be a voltage amplifying device that is designed to be used with external feedback components such as resistors and capacitors between its output and input terminals