[SI-LIST] Re: How to couple noise to the PDN of oscillator
- From: David Instone <dave.instone@xxxxxxxxxx>
- To: Zhangkun <zhang_kun@xxxxxxxxxx>
- Date: Thu, 15 May 2008 15:48:21 +0100
Simplistic approach.
You want to know how much jitter you get for x amount of supply noise
rather than how much jitter are you getting from the supply noise you've
got in normal operation? If so then put the same oscillator on a test
board that doesn't have such a low PDN impedance. You could even design
the PDN of the test board specifically to allow noise to be injected.
Regards
Dave Instone
+44 (0)1235 824963
OXFORD SEMICONDUCTOR LIMITED
25 MILTON PARK
ABINGDON
OXFORDSHIRE
OX14 4SH
Registered in England no 2733820
Registered Address: As above
Zhangkun wrote:
> Dear all
>
> Now we are studying the effect of power noise on jitter. We meet a problem,
> how to couple noise to the PDN. For example, we want to couple noise of
> 25MHz into the PDN of oscillator. However there is impedance dismatch. The
> impedance of signal source is about 50ohm and that of PDN is about 0.1ohm.
> The energy would be reflected.
>
> Any advice would be helpful
>
> Best Regards
>
> Zhangkun
> 2008.5.14
>
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