Editing Buffer amplifier (section)

====Chart of single-transistor amplifiers====
Some configurations of single-transistor amplifier can be used as a buffer to isolate the driver from the load.  For most digital applications, an NMOS voltage follower (common drain) is the preferred configuration.{{Dubious|date=August 2015}}  These amplifiers have high input impedance, which means that the digital system will not need to supply a large current.
{| class="wikitable" border="1"
|-
! Amplifier type
! <small>MOSFET</small> (NMOS)
! BJT &nbsp;&nbsp;&nbsp;(npn)&nbsp;&nbsp;&nbsp;
! Notes
|-
| [[Common gate]]/[[Common base|base]]
| [[File:N-channel JFET common gate.svg|frameless]]
| [[File:NPN common base.svg|frameless]]
| Typically used for current buffering
|-
| [[Common drain|Common drain/collector]]
| [[File:N-channel JFET source follower.svg|frameless]]
| [[File:NPN emitter follower.svg|frameless]]
| Voltage gain is close to unity, used for voltage buffering.
|}