A buffer amplifier can be used to transform high input impedence to low output impedence, or vice-versa.
A buffer amplifier of unity gain is generally used when you need to islolate the source.Connecting a source to an amplifier, can have an affect on the original signal. A buffer amplifier stops the signal being affected by the subsequent amplifier sections. The input to the buffer is matched to the signal impedance.
design and implementation of a buffer circuit using operational amplifier
No. In the general case, a buffer amplifier is an analog device, but an AND or an OR gate is a digital device. Even in the specific case of a digital buffer amplifier, its still not the same because the digital buffer amplifier has more power available in its output circuit, giving it a higher fanout than just an ordinary AND or OR gate.
the common collector can use as voltage buffer
function of a frame buffer in computer?
Common collector amplifier can be used as a voltage buffer and in impedance matching
A buffer amplifier is a type of operational amplifier that amplifies your input signal with a gain of 1 (so your output will be identical to your input, voltage-wise). Buffer amplifiers are used commonly due to having a very high input impedance. This means that loading effects (external factors that your circuit has to deal with) like large currents that could mess with your circuit otherwise, are avoided. A buffer amplifier is often used as the first stage of a circuit because it effectively isolates your circuit from loading effects.
noninverting, increased current drive.
You need an amplifier for any speakers if they are to function.
An amplifier is used to increase the strength of the signal.
A transistor
The Peavey 5150 amplifier, made by the Peavey Electronics Company, is a very specialized all-tube guitar amplifier originally made for Eddie Van Halen.