LDO PSRR Doubt

Thread Starter

hoyyoth

Joined Mar 21, 2020
323
The below post is from this site.

https://www.allaboutcircuits.com/technical-articles/understanding-noise-and-psrr-in-ldos/

I have some questions in the regarding the statement given below.


An LDO that has:

PSRR= 55 dB

Frequency= 1 MHz

Input ripple = 1mV

It can attenuate a 1 mV at this frequency to just 1.78 µV at the output. So, there is 6dB increase in PSRR, which is equals to an increase in attenuation by a factor of 2.

May I know how they arrive increase in 6dB PSRR which is equals to an increase in attenuation by a factor of 2
 
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