[time-nuts] Power Supply Noise Affects Thunderbolt 1 PPS
Charles P. Steinmetz
charles_steinmetz at lavabit.com
Tue Feb 28 05:13:18 UTC 2012
>So, for best HF noise performance where the input noise may be
>large, it's best to use a follower or shunt regulator topology,
>despite the lower efficiency - unless efficiency is more important.
To put it more bluntly, the last time I looked (it has been a while,
so there may be something new I haven't seen) LDOs were all
substantially inferior to standard regulators in terms of noise
feedthrough and HF load regulation. The rule of thumb has always
been to avoid LDOs unless low dropout was the paramount concern. Has
something changed with current LDO designs to make them competitive
with standard regulators in terms of noise feedthrough and HF load regulation?
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