[sdiy] A question about regulator noise figures

[Mike Bryant]

Another thing to consider is do you really need a well regulated voltage, or in fact would a lower noise floor than the regulator can give at the expense of poorer regulation, be better ?   A compound darlington transistor with base fed by a resistor and capacitor to ground to form a capacitance multiplier, with a zener across the capacitor to give some sort of voltage regulation, can be better in some applications provided you don't need a fast dynamic response to load changes.  


-----Original Message-----
From: Synth-diy [mailto:synth-diy-bounces at synth-diy.org] On Behalf Of Tom Wiltshire
Sent: 15 March 2021 23:57
To: Markus via Synth-diy
Subject: [sdiy] A question about regulator noise figures

Hi All,

I’ve been reading data sheets for linear regulators, and I’ve got a question.

Some regulators specific the output noise voltage from 10Hz to 100KHz as an RMS level, usually uV. However, the Microchip MCP1702 specifies an output noise figure as 8 uV/Hz. What does this mean? What’s the relationship between uV/Hz and RMS uV?

Here’s the datasheet:

https://4donline.ihs.com/images/VipMasterIC/IC/MCHP/MCHPS03366/MCHPS03366-1.pdf?hkey=6D3A4C79FDBF58556ACFDE234799DDF0

Thanks for any guidance!

Tom

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Synth & Stompbox DIY
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