[time-nuts] low power, but quiet, oscillators

Bob Camp kb8tq at n1k.org
Mon Feb 6 17:37:51 EST 2017


One of the most basic reasons for putting out > +20 dbm is that you 
had a spec of -195 dbc / Hz for the noise floor :) 

Some of these specs *are* a bit mutually exclusive. 


> On Feb 6, 2017, at 3:19 PM, jimlux <jimlux at earthlink.net> wrote:
> We're always looking for low DC power, but quiet (close in), oscillators for spaceflight applications, particularly as the spacecraft get smaller.
> I was intrigued by the paper Ulrich posted which actually called out a "mW RF out for mW DC in" as part of their FoM.
> Is there a list somewhere of what sort of DC/RF efficiencies are possible/typical.  In particular, I'm interested in topologies/designs that put out low powers.. (1 mW or less).  There's lots of designs that put out a convenient +10dBm or +13dBm or 3.3V CMOS square wave or whatever.. but sometimes, you only need to radiate a few mW  (I would think the low power Bluetooth/Zigbee/802.15xxxx folks have been thinking about this)
> Jim
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