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There are many sources of noise within an amplifier. The equations shown in this slide are used to calculate the effect on the output. The current noise on the inverting input is multiplied by the feedback resistor, which contributes to Johnson noise. Voltage noise on the input has to multiplied by the noise gain, which is (1 + Rf/Rg). Current noise on the non-inverting input is also multiplied by the noise gain. Lastly, Rg and Rp contribute to noise as well. (Rp = parallel combination of Rf & Rg. Rp compensates for bias current).
PTM Published on: 2009-01-26
New Zealand