热噪声 Thermal noise
生活随笔
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热噪声 Thermal noise
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熱噪聲在線計算
https://www.daycounter.com/Calculators/Thermal-Noise-Calculator.phtml
Vn_RMS=4KBTRΔfinVrmsV_{n\_RMS} = \sqrt{4K_BTR\Delta{f}} \ in \ V_{rms}Vn_RMS?=4KB?TRΔf??in?Vrms?
vn=4KBTRinV/Hzv_n = \sqrt{4K_BTR}\ in \ V/\sqrt{Hz}vn?=4KB?TR??in?V/Hz?
in=4KBT/RinA/Hzi_n = \sqrt{4K_BT/R}\ in \ A/\sqrt{Hz}in?=4KB?T/R??in?A/Hz?
in dB
dBV=20log10(V)dBV = 20log_{10}(V)dBV=20log10?(V)
SR760
https://www.thinksrs.com/downloads/pdfs/manuals/SR760m.pdf
SR570
https://www.thinksrs.com/products/sr570.html
| ohm | V/Hz^(1/2) | nV/Hz^(1/2) | dBV/Hz^(1/2) | A/Hz^(1/2) | A/V | V/Hz^(1/2) | nV/Hz^(1/2) | dBV | |
| sqrt(4kBT*R) | sqrt(4kBT*R) | sqrt(4kBT/R) | sqrt(4kBT/R)/G | sqrt(4kBT/R)/G | |||||
| 2k | 2.00E+03 | 5.75E-09 | 5.8 | -164.8 | 2.88E-12 | 1.00E-06 | 2.88E-06 | 2877.5 | -110.8 |
| 5k | 5.00E+03 | 9.10E-09 | 9.1 | -160.8 | 1.82E-12 | 1.00E-06 | 1.82E-06 | 1819.9 | -114.8 |
| 10k | 1.00E+04 | 1.29E-08 | 12.9 | -157.8 | 1.29E-12 | 1.00E-06 | 1.29E-06 | 1286.9 | -117.8 |
| 1M | 1.00E+06 | 1.29E-07 | 128.7 | -137.8 | 1.29E-13 | 1.00E-06 | 1.29E-07 | 128.7 | -137.8 |
| 2.2M | 2.20E+06 | 1.91E-07 | 190.9 | -134.4 | 8.68E-14 | 1.00E-06 | 8.68E-08 | 86.8 | -141.2 |
| 6.8M | 6.80E+06 | 3.36E-07 | 335.6 | -129.5 | 4.93E-14 | 1.00E-06 | 4.93E-08 | 49.3 | -146.1 |
| 10M | 1.00E+07 | 4.07E-07 | 406.9 | -127.8 | 4.07E-14 | 1.00E-06 | 4.07E-08 | 40.7 | -147.8 |
ref
https://tableconvert.com/excel-to-markdown
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