On 12/9/2014 1:30 PM, ed breya wrote:
buried zener for lowest noise - this eliminates all the low voltage references and three-terminal etc regulators that use band-gap references. The down side is that the good kind of reference ICs will need a higher (like 10V and up) operating voltage than may be available, so that complicates it.
Great post, Ed. I might add that my understanding of band gap regulators is that they rely on amplifying a small DC difference in voltage between two transistors. This also amplifies the SUM of the noise of the respective inputs, which jacks up the noise to much more than a good zener. Because of physics, no band gap reference will ever be low noise. Rick Karlquist N6RK _______________________________________________ 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.
