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https://designers-guide.org/forum/YaBB.pl Design >> Mixed-Signal Design >> Splitting the Cap would increse the thermal noise ?? https://designers-guide.org/forum/YaBB.pl?num=1293732668 Message started by jefkat on Dec 30th, 2010, 10:11am |
Title: Splitting the Cap would increse the thermal noise ?? Post by jefkat on Dec 30th, 2010, 10:11am Hi Guys, If I have a switched cap integrator and I split its input sampling cap into two equal halves (see the attachement). Would the equivalent input thermal noise (KT/C) double aswell? In my opinion it should double because both caps are independantly sampling or I missed something. Please have a look at this jpg that shows what I am asking. Thanks for the answers. shaf |
Title: Re: Splitting the Cap would increse the thermal noise ?? Post by ssahl on Jan 2nd, 2011, 7:22am The total noise will not double. For each capacitor it will. But your circuit will add the noise currents from the two input capacitors and the sum will be equal to the one comming from the only one capacitor case. |
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