Filter injects noise

RC filter or amplifier’s lowpass filter at the input of a delta-sigma ADC is normally put there to reduce noise. But sometimes adding a filter can produce a noisier digital output than without that filter. Using an analog filter to inject noise article tells that it is as easy to eliminate higher-frequency noise with an analog lowpass filter as it is to inject noise into the frequency band below the corner frequency of your filter. If you change your circuit design by reducing your filter’s resistor values, you will increase the noiseless bits in the circuit.

filternoise

 

17 Responses to “Filter injects noise”

  1. Charlie says:

    Hello,
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    Charlie

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    Hobosic

  3. tomi says:

    I am from Finland.

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    cheers

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  11. tomi says:

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  12. Burton Haynes says:

    This was a great post, thank you for sharing.

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    I think audiophiles need to worry less about the perfection of sound and instead try to immerse himself (or herself) in the music.

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  15. Andrew Pelt says:

    Wow, That was very informative, thanks for sharing

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    There’s no way that can be true. Can it?

  17. Jon Brink says:

    I discovered an audio website that is much more fun than regular old forums. Check it out when you have a moment…

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