A low pass filter has an input S/N of 20. The input voltage is 3 mV. Calculate the noise voltage.

0.67 m V

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670 m V

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6.7 m V

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67 m V

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Solution

The correct option is A $0.67 m V$
The signal to noise ratio is,

$\frac{S}{N} = \frac{V_{S}^{2}}{V_{n}^{2}}$

$∴$ Noise voltage

$V_{n} = \frac{V_{S}}{\sqrt{S / N}} = \frac{3}{\sqrt{20}} = 0.67 m V$

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A low pass filter has an input S/N of 20. The input voltage is 3 mV. Calculate the noise voltage.

The correct option is A 0.67mVThe signal to noise ratio is, SN=V2SV2n ∴ Noise voltage Vn=VS√S/N=3√20=0.67mV

The correct option is A $0.67 m V$
The signal to noise ratio is,

$\frac{S}{N} = \frac{V_{S}^{2}}{V_{n}^{2}}$

$∴$ Noise voltage

$V_{n} = \frac{V_{S}}{\sqrt{S / N}} = \frac{3}{\sqrt{20}} = 0.67 m V$