Subject: Re: [IBIS-Users] EBD [Path Description] question
From: Scott McMorrow (scott@teraspeed.com)
Date: Thu May 16 2002 - 22:53:01 PDT
Kazu,
You are correct. In an EBD, R is DC resistance. AC skin effect
resistance is not
specified in an EBD file. For high frequencies, you must account for
skin effect,
dielectric loss, along with changes in inductance and capacitance as a
function of
frequency. A modeling method other than EBD is required for high
frequencies
and fast edge rates.
regards,
scott
-- Scott McMorrow Teraspeed Consulting Group LLC 2926 SE Yamhill St. Portland, OR 97214 (503) 239-5536 http://www.teraspeed.comKazu Tsukada wrote:
>Hello > >I have a question about EBD Path Description. >V3.2 spec says that : > | The Len, L, R, and C subparameters specify the length, the > | series inductance, resistance, and the capacitance to ground > | of each section in a path description. > | > | Len The physical length of a section. Lengths are given > | in terms of arbitrary 'units'. Any non-zero length > | requires that the parameters that follow must be > | interpreted as distributed elements by the simulator. > | L The series inductance of a section, in terms of > | 'inductance/unit length'. For example, if the total > | inductance of a section is 3.0 nH and the length of > | the section is 2 'units', the inductance would be > | listed as L = 1.5 nH (i.e. 3.0 / 2). > | C The capacitance to ground of a section, in terms of > | capacitance per unit length. > | R The series DC (ohmic) resistance of a section, in > | terms of ohms per unit length. >Does this R mean literally DC(at 0MHz) resistance ? > >There are some EDA tools which can consider skin effect when computing >trace resistance. Some vender suggests to consider skin effect. >Thank you. >-Kazu Tsukada/Melco,Inc. >|------------------------------------------------------------------ >|For help or to subscribe/unsubscribe, email majordomo@eda.org >|with just the appropriate command message(s) in the body: >| >| help >| subscribe ibis <optional e-mail address, if different> >| subscribe ibis-users <optional e-mail address, if different> >| unsubscribe ibis <optional e-mail address, if different> >| unsubscribe ibis-users <optional e-mail address, if different> >| >|or email a written request to ibis-request@eda.org. >| >|IBIS reflector archives exist under: >| >| http://www.eda.org/pub/ibis/email_archive/ Recent >| http://www.eda.org/pub/ibis/users_archive/ Recent >| http://www.eda.org/pub/ibis/email/ E-mail since 1993 > > > >
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