File:RC-noise simpler.png

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    Summary

    Description
    English: Johnson–Nyquist voltage noise from two different values of resistor R on the same 2.6pF capacitor C. Even though the larger R produces higher noise density in the low-frequency passband, the total noise (summed over all frequencies) on C is identical
    Date
    Source Own work
    Author Em3rgent0rdr

    ```LTSpice simulation .asc file:

    Version 4.1 SHEET 1 880 680 WIRE 48 128 16 128 WIRE 160 128 128 128 WIRE 16 144 16 128 WIRE 160 144 160 128 WIRE 160 224 160 208 FLAG 160 128 out FLAG 16 224 0 FLAG 160 224 0 SYMBOL voltage 16 128 R0 WINDOW 123 0 0 Left 0 WINDOW 39 0 0 Left 0 WINDOW 0 -40 12 Left 2 SYMATTR InstName Vin SYMATTR Value "" SYMBOL cap 176 208 R180 WINDOW 0 24 56 Left 2 WINDOW 3 24 8 Left 2 SYMATTR InstName C SYMATTR Value 2.6p SYMBOL res 144 112 R90 WINDOW 0 0 56 VBottom 2 WINDOW 3 32 56 VTop 2 WINDOW 39 60 56 VTop 2 SYMATTR InstName R SYMATTR Value 60Meg SYMATTR SpiceLine TEMP=30 TEXT -88 272 Left 2 !.noise V(out) Vin dec 1000 1 1meg ```

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    Captions

    Johnson–Nyquist voltage noise from two different values of resistor R on the same 2.6pF capacitor C. Even though the larger R produces higher noise density in the low-frequency passband, the total noise (summed over all frequencies) on C is identical

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    4 June 2025

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    current18:55, 4 June 2025Thumbnail for version as of 18:55, 4 June 2025554 × 365 (24 KB)wikimediacommons>Em3rgent0rdrUploaded own work with UploadWizard

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