[time-nuts] Power Supply Noise Affects Thunderbolt 1 PPS

[gary]

I hate to be argumentative, but you can't be low drop out and use an 
emitter follower. Draw the circuit and convince yourself. You would need 
a high side driver scheme to drive the base/gate, and that require some 
sort of boost converter. It can be done on switchmode chips, but not in 
a linear circuit. Well unless you ship it with a battery.



On 2/27/2012 9:51 PM, David wrote:
> The highest performance low dropout regulators I have seen use
> emitter/source followers with a low current bias supply.
>