Thanks, Bruce, for the circuit. I don't recognize the transformer numbers in your schematic. Can you tell us more about the nature of the transformers you have specified?
Bruce Griffiths wrote: > George > > The circuit schematic for a BJT version of the JFET frequency is attached. > The biasing is a little more complex as it is necessary set each > frequency doubler BJT collector current at about 1mA or so to maximise > conversion gain. > The input impedance is also around 50 ohms. > Have also minimised the number of different component values used. > Other transistors may be substituted but some care is required as the > reverse voltage across the base emitter junction is about 2V for a > +13dBm input. > Some filtering of the output waveform is required. > The intended output load is 50 ohms. > > The 200 ohm emitter series resistors together with the transformed > source impedance ensure that there is sufficient degeneration to keep > the phase noise low. > > Obtaining suitable transistors for this circuit should be much easier > than obtaining suitable JFETS for the JFET doubler. > > Whilst a diode doubler (at higher frequencies this may be the only > sensible option) could be used it would need both an input amplifier and > an output amplifier. > > 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. _______________________________________________ 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.