what is difference between repeater and amplifier

what is difference between repeater and amplifier




An amplifier is an electronic device that increases the voltage, current, or power of a signal. Amplifiers are used in wireless communications and broadcasting, and in audio equipment of all kinds. They can be categorized as either weak-signal amplifiers or power amplifiers.

Weak-signal amplifiers are used primarily in wireless receivers. They are also employed in acoustic pickups, audio tape players, and compact disc players. A weak-signal amplifier is designed to deal with exceedingly small input signals, in some cases measuring only a few nanovolts (units of 10-9 volt). Such amplifiers must generate minimal internal noise while increasing the signal voltage by a large factor. The most effective device for this application is the field-effect transistor. The specification that denotes the effectiveness of a weak-signal amplifier is sensitivity, defined as the number of microvolts (units of 10-6 volt) of signal input that produce a certain ratio of signal output to noise output (usually 10 to 1).

Re: what is difference between repeater and amplifier

a repeater is an amplifier…amplifying the input signal out to the other side.

However, repeaters also amplify noise as well therefore limiting the number of repeaters used in any given network segment.

Intelligent repeaters and bridges will amplify signal, but without the noise…the signal being regenerated before sending.