[SI-LIST] Re: Query on power noise sensitivity measurement problem

When performing these measurements I manually adjust the power bus injected
signal for each frequency. If you'd like to perform a single sweep an
amplifier can be configured to maintain a constant amplitude into the power
bus.
    Dave Cuthbert


On Sun, Apr 27, 2008 at 10:42 PM, <robert_sleigh@xxxxxxxxxxx> wrote:

> Greetings,
>
> Here's a link to a recent seminar which covers TX/RX PLL =
> characterization. http://www.techonline.com/learning/webinar/206801021=20
>
> This measurement technique would also allow measurement of the Jitter =
> Spectrum (RJ/PJ RJ/SJ) while injecting "power noise on PLL power".=20
>
> Best regards,
> Rob Sleigh
> Digital Test Division
> Agilent Technologies, Inc.
>
> -----Original Message-----
> From: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx] =
> On Behalf Of Huang chunxing
> Sent: Saturday, April 26, 2008 2:02 AM
> To: si-list@xxxxxxxxxxxxx
> Subject: [SI-LIST] Query on power noise sensitivity measurement problem
>
> Content-type: text/plain; charset=3Dgb2312
> Content-transfer-encoding: 7BIT
> Hi experts,
>
> I am trying to find out whether it is possible to get the relationship =
> between powernoise and output jitter by measurement.
> To be convenient, I would like to call it Power Noise sensivity. =20
>
> My initial thought is to inject a certain frequency power noise on PLL =
> power, and then measure SJ at the frequency on TX output signal.=20
> But it is some difficult to be applied in practice due to PDN impedance =
> variance.
> Is there any craft method to avoid it?
>
> As to RX side, it is difficult to loop out clock recovered by CDR.
> I was ever been told that as TX and RX share same PLL, or use same =
> design PLL, so power sensitivity at RX is similar with power sensitivity =
> at TX. If we measure power sensitivity at TX, then we can get one at RX.
> Is that true, or could stand at most cases?
>
> I tried to find some documents for reference, but I failed.
> I hope experts here who ever did similar work may give me some comments =
> and suggestions.
> Thanks in advance! =20
>
>
> Regards,
>
> Huang Chunxing
> HUAWEI TECHNOLOGIES CO.,LTD. =20
>
>
> Address: Huawei Industrial Base
> Bantian Longgang
> Shenzhen 518129, P.R.China
> Tel: +86 755 89651027
> Fax: +86 755 89650600
> E-mail: huangchunxing@xxxxxxxxxx
> www.huawei.com
>
>
>
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