/blogs_/archives/b/thesignal/posts/resistor-noise-reviewing-basics-plus-a-fun-quizThe noise performance of amplifier circuits is greatly affected by the Johnson noise of resistors—the source resistance and feedback resistors. Most everyone seems to know that resistors have noise but may be a bit foggy on some of the details. Here’sen-USTelligent Community 13https://e2e.ti.com/blogs_/archives/b/thesignal/posts/resistor-noise-reviewing-basics-plus-a-fun-quizFri, 07 Dec 2012 16:48:49 GMTcb01d8b2-d089-468d-babb-77d1d8683490:e3f7a2ce-b1b8-4446-a034-46e97a0fb090Bruce Trump0<p>Jens-Michael-- you are correct, assuming a constant stray capacitance, the total noise is independent of the resistor value. Higher value resistors have a higher noise density but the bandwidth rolls off at a lower frequency.</p> <img src="https://e2e.ti.com/aggbug?PostID=663823&AppID=864&AppType=Weblog&ContentType=0" width="1" height="1">https://e2e.ti.com/blogs_/archives/b/thesignal/posts/resistor-noise-reviewing-basics-plus-a-fun-quizFri, 07 Dec 2012 16:18:18 GMTcb01d8b2-d089-468d-babb-77d1d8683490:e3f7a2ce-b1b8-4446-a034-46e97a0fb090Jens-Michael Gross0<p>If I take the result of the quiz right, doesn&#39;t it mean that the total open circuit noise voltage is independent of the resistor value and only the noise frequency bandwidth depends on the resistor value? You always have a stray parallel capacitance, even if it is infinite small?</p> <img src="https://e2e.ti.com/aggbug?PostID=663823&AppID=864&AppType=Weblog&ContentType=0" width="1" height="1">