Hi all, I have used decoupling capacitors in digital circuits. And I know that the decoupling capacitor is very helpful for the power/ground impedance and SSN reduction. But I wonder if the principle of decoupling capacitor is also acceptable for analog circuit such as LNA and PA. One of my colleagues has simulated the effect of the decupling capacitor for the LNA he has designed by himself. By adding several decoupling capacitors on LNA chip (it has ideal power/ground source, ie, no p/g noise), the output gain characteristics of LNA have changed. So I thought that we better not apply the decoupling capacitors in the analog chips such as LNA or PA, but I am not sure about that. How could the decoupling capacitors affect LNA's signal output? I don't think the decoupling capacitor causes the mismatch of the signal input or output. Somebody has any idea about these phenomena? Thanks in Advance, Jongbae Park. Jongbae Park Ph.D Candidate Terahertz Interconnection & Package Laboratory,Department of Electrical Engineering, Korea Advanced Institute of Science and Technology (KAIST) E-mail) pjb77@xxxxxxxxxxxxxxxxxx URL) http://tera.kaist.ac.kr/ ------------------------------------------------------------------ To unsubscribe from si-list: si-list-request@xxxxxxxxxxxxx with 'unsubscribe' in the Subject field or to administer your membership from a web page, go to: //www.freelists.org/webpage/si-list For help: si-list-request@xxxxxxxxxxxxx with 'help' in the Subject field List FAQ wiki page is located at: http://si-list.org/wiki/wiki.pl?Si-List_FAQ List technical documents are available at: http://www.si-list.org List archives are viewable at: //www.freelists.org/archives/si-list or at our remote archives: http://groups.yahoo.com/group/si-list/messages Old (prior to June 6, 2001) list archives are viewable at: http://www.qsl.net/wb6tpu