[time-nuts] Linear voltage regulator hints...
Richard (Rick) Karlquist
richard at karlquist.com
Tue Dec 9 18:51:11 EST 2014
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
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