Am Fri, 21 Feb 2014 11:42:05 -0800 (PST) schrieb Bob Albert <[email protected]>: > Oops yes I goofed, it's 500 MHz. 500 GHz is beyond state of the art > I would think. > Depends on your circuit development skills. Bipolars with gain at 500GHz are in principle possible, both in III/V-semiconductors (InP comes to mind, but even GaAs might do the trick), and in SiGe this is currently under research. But you're right, 500GHz at system level is extremely difficult, I'm not aware of any reasonable demonstration. 5THz (= Far Infrared) is much easier in that regard... > > So GPS satellites are NIST in miniature it seems. That's a lot of > payload but now I have to see how to gain access to it. > Well, NIST does more than just time, while GPS essentialy is just that: a precise clock that is also used to calculate positions.
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