Andy - Glad to be of some small help. A couple of remarks re your comments
John, thanks for your input, you reminded me that LFP performance often depends on source impedance. To the MMIC amplifier, you'd be amazed what you can do with an opamp these days. I was amazed reading the datasheet for the LTC6409 a 10GHz GBW, 1.1nV/sqrt(hz) fully differential opamp. With a gain of one, the frequency response is totally flat out to 1GHz. No actually I would not. I suggested the RF MMIC like one of the Mini-Circuits types because they have enough gain to recover the insertion loss of the input pad and the filter. They are also stable as a house not located in California. That leaves some gain margin for you to pad the output down to the desired level or to split it. As for the super duper chips methinks it is best to use no more performance capability than you need. Other wise you end up fighting oscillations, termination issues, and the necessity for very specific layout techniques. The hottest device is not always easiest to apply. Actually a 2N2222 in common emitter will give more than 20 dB of gain and 100 mW out at 10 MHz and no microwave stability issues. It is just a matter of what is easiest for you to design and implement. -73 john k6iql _______________________________________________ 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.
