[time-nuts] Linear voltage regulator hints...

Vasco Soares vesoares at deea.isel.ipl.pt
Tue Dec 9 13:38:34 EST 2014

Hi All,

Take a look on the low noise 1.5A LDO regulator LT1963 and 500 mA LT1763. 
Voltage regulation depend on how good is the circuit behaviour with respect 
to Noise, PSRR, Line regulation and Load regulation. For instance some LT 
regulators like LT1117, 1085 and 1086 have < 1% of Line and Load regulation 
but have worst noise specs than LT1963, LT1763, MCP1825, MCP1826.

Vasco Soares

----- Original Message ----- 
From: "Dan Kemppainen" <dan at irtelemetrics.com>
To: <time-nuts at febo.com>
Sent: Tuesday, December 09, 2014 4:57 PM
Subject: Re: [time-nuts] Linear voltage regulator hints...

> Hi All,
> Thanks for the responses. I had a feeling the answer wouldn't be good, but 
> was hoping someone would have a suggestion. There are currently a bunch of 
> regulators in the 'system'. If there were some really good regulator out 
> there, the shotgun approach would apply...
> Of course it is difficult to provide a good reference and pass transistor 
> on the same die, but it was worth asking.
> Bert,
> The thought of temp control of the regulators crossed my mind. Not 
> planning on going there unless I need to. But it was a thought, maybe if 
> all else fails...
> Bob,
> > There are more modern parts with lower close in noise. Linear
> Technology has a number of them. Your filter caps take out the broadband 
> stuff, close in is all that really matters.
> >
> Got any hints on which ones? Maybe a nice quiet regulator can be 
> 'disciplined' with a better reference.
> Thanks,
> Dan
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