As far as consoles are concerned, there seem to be two types lying around.
Shield Emitter Amplifiers, which provide a percent bonus to shield regeneration rate, and
Field Emitters, which increase shield power setting.
How do these two interact?
We know that shield power levels increase the amount of shield pts regenerated every 6 seconds by about 4% per point of setting above 50 power, so it's obvious what a field emitter does...
What exactly does a shield emitter amplifier modify?
-the base amount regenerated (listed in the static tooltip of the shield module)?
-The final amount (base+power increase)?
-The time between regeneration? (i.e. reducing the 6 sec base so that shields regenerate more often than once every 6 sec)?