[SI-LIST] Re: 答复: About Power Management IC which can sink current
- From: steve weir <weirsi@xxxxxxxxxx>
- To: Zhangkun <zhang_kun@xxxxxxxxxx>
- Date: Wed, 10 Sep 2008 02:26:22 -0700
Zhangkun, the source and sink run all the way down to DC. The bypass
capacitors integrate the charge difference each cycle. Without a sink
path Vtt will wander.
Steve.
Zhangkun wrote:
> Hi Han
>
> In the VTT of DDR, the source and sink current is of high frequency, which
> is provided by the decoupling capacitor.
>
> Hope this is helpful
>
> Best Regards
>
> Zhangkun
> 2008.9.10
>
>
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> -----邮件原件-----
> 发件人: si-list-bounce@xxxxxxxxxxxxx [mailto:si-list-bounce@xxxxxxxxxxxxx]
> 代表 Han Li
> 发送时间: 2008年9月8日 11:06
> 收件人: SI LIST
> 主题: [SI-LIST] About Power Management IC which can sink current
>
> Hi, Gurus,
> In DDR termination, Vtt requirements a Power Supply IC that can sink
> and source current. Many of these are LDO, some are DC-DC(such as Linear's
> LTC3776).
> I wondered how does current flow into a DC-DC when in sink mode. (It seems
> relatively easier to analyze when an IC is a LDO, but swithing an one). What
> is the sink-current path inside an IC. Does it have an inside load which
> porvides a path to ground?
> Thank you very much.
>
>
>
>
> --
> Best Regards
> Li Han
>
>
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