[time-nuts] Anybody want a Thunderbolt power supply?

jimlux jimlux at earthlink.net
Wed Aug 31 15:36:21 EDT 2016

On 8/31/16 12:01 PM, Mark Sims wrote:
> You have to be careful choosing a linear regulator to clean up a switching supply.   Many just wind up passing the noise through.  Pay attention to the noise, PSRR and CMRR vs frequency specs, etc

a lot of monolithic regulators have a remarkably low cutoff frequency.

On the other hand, the LT3042 has 80 dB PSRR up to a few MHz.  55dB at 
10 MHz.

> Take a look at the "voltage regulation" section of that home built VNA page for an example:
> http://hforsten.com/cheap-homemade-30-mhz-6-ghz-vector-network-analyzer.html
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