randy warner wrote: > Guys, > > I need to come up with a 0db little splitter to route 1 antenna into 2 GPS > receivers. To keep the isolation up I want to use an active splitter instead > of a passive one. I suppose I could use a passive splitter followed by two > LNA's (one to each receiver), but I would then have to add a lot of > attenuation to knock the signal back down. I suppose it would work, but the > noise factor sure wouldn't be optimum. > > Does anyone out there know of a single/dual IC solution to this? Everything > I have found LNA wise is in the 10-30 dB range. Note that this will be a > board mounted circuit and I don't have to worry about connectors, etc. I'm > hoping to find a little solution that I can cover with one of Laird's > standard shield cans. > > Thanks, > > Randy Warner > Randy
The only solution that springs to mind is to amplify split/attenuate amplify attenuate. If one uses low noise amplifiers and maintains a net gain before the output attenuator then the noise figure can be kept reasonably low. This requires an input amplifier followed by a splitter and possibly an attenuator followed by an amplifier with an output attenuator for each of the 2 splitter outputs. The output attenuators will also increase the isolation by a few dB. Bruce _______________________________________________ time-nuts mailing list -- time-nuts@febo.com To unsubscribe, go to https://www.febo.com/cgi-bin/mailman/listinfo/time-nuts and follow the instructions there.