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noise_graphs datasheet

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dark

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Hello Forum,

The graph uV/sqrt(Hz) Vs frequency .As the frequency is increasing the noise is reducing , my question is why would one allow a high frequency component to pass through in the first place to get low noise in the output ? . I feel I am interpreting something wrong ,this spec I am checking for the first time as I need ultra low noise at output.

-D
 

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audioguru

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Some old opamps are very noisy. Some audio opamps have very low noise.
It is your choice.
 

dark

Member
I am sorry , let me be more specifie I somehow deleted the first line of my post . This is spec diagram from Analog devices LDO .

-D
 

audioguru

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Is it a low dropout voltage regulator?
It has a lot of transistors inside that create a little amount of noise.
A larger output capacitor might reduce the high frequency noise.
 

dark

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audioguru

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It is ADP150.
It is an Ultra-Low-Noise low-dropout voltage regulator. Its noise is very low and levels out at 100kHz.

I need to ask as the LDO is injecting Low noise at high frequency if I put a large RC filter at output it will increase noise , is this so?
If you add a series resistor then a capacitor to ground at the output then the noise will be reduced but the voltage regulation will be poor.
 
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