[SI-LIST] Re: Decoupling Capacitor for LNA and PA
- From: steve weir <weirsi@xxxxxxxxxx>
- To: jbtera77@xxxxxxxxx,si-list@xxxxxxxxxxxxx
- Date: Tue, 30 May 2006 04:50:33 -0700
Jongbae, there is something lost in translation. It sounds like your
circuit has feedback through the power supply between stages. Bypass
is inadequate. You need to decouple.
Steve.
At 12:06 AM 5/30/2006, jbtera77@xxxxxxxxx wrote:
>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/
>
>
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