Hi Somethings to consider:
How quiet are the sources you will be running through this amplifier? How predictable are the levels of the sources? How important is isolation? Do you need lowpass / bandpass filtering (are there other RF sources running around?)? Is ESD on the coax an issue (do you need a high value resistor here or there?) ? Bob > On Nov 30, 2015, at 3:02 PM, Anders Wallin <anders.e.e.wal...@gmail.com> > wrote: > > HI all, > I need to build a few distribution amplifiers (>90% for 10MHz, sometimes > maybe 5MHz) and instead of reinventing the wheel I decided to try to > modernize the TADD-1 into an all (almost) SMD design. Here are some draft > sketches: > http://www.anderswallin.net/2015/11/frequency-distribution-amplifier-plans-a-k-a-smd-tadd-1/ > > Does this sound/look reasonable or crazy? > Any suggestions for op-amps to try and/or compare to the AD8055? > What causes the extra phase-noise below 1 Hz offset in John A's result: > https://www.febo.com/pages/amplifier_phase_noise/amplifier_phase_noise.png > > Suggestions for a low noise DC-regulator circuit? The 12-24VDC supplied to > this board will most likely come from a switched-mode PSU, so filtering of > common-mode noise is mandatory. > I found the TI LP38798 shown in the schematic by googling - if someone has > a proven a measured design that would be a safer choice. In any case more > filtering (e.g. ferriites) is probably a good idea. > > This design will be available on my blog or on github when it is done - if > anyone is interested. > > Thanks, > Anders > _______________________________________________ > 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.
