[time-nuts] TNS-BUF update
bruce.griffiths at xtra.co.nz
Sun Aug 19 08:43:25 EDT 2018
Yes, I looked at the plots and I see exactly what I described.
2nV/rtHz at frequencies somewhat above the reference current source output RC filter, rising to a high value at frequencies below the current source output filter pole.
This is an inherent property of the architecture.
The LT3042 is better in this regard than TI's offerings but only because its easy to filter the reference and set the filter pole frequency much lower.
Its also quieter than the Abracon low noise supply that I have.
> On 20 August 2018 at 00:25 Gerhard Hoffmann <dk4xp at arcor.de> wrote:
> You did not take a look at the plots, did you?
> It is seldom to find these data taken all in an identical setup.
> Am 19.08.2018 um 14:07 schrieb Bruce Griffiths:
> > The LT3042 is still inherently very noisy at ultra low frequencies approaching and below the pole frequency (can be well below 1Hz) of the reference filter (There's a limit to the maximum capacitance available/feasible). Forward biased diodes including LEDs are quieter in this region.
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