Re: [SI-LIST] : IC input impedance

Dennis Tomlinson (det@tellabs.com)
Wed, 14 Oct 1998 11:55:45 -0500

Note: I didn't invent this rule of thumb. I first saw it years ago on some
Tektronix literature for a 10 MHz scope. I've also heard it from several
other's over the years.

Any other comments?

Cheers,

Dennis

>
> Marin Sampaleanu
> Nortel, Wireless Development Calgary.
> > ----------
> > From: Dima Smolyansky[SMTP:dima@tdasystems.com]
> > Sent: Tuesday, October 13, 1998 9:18 AM
> > To: 'Shimon_Turgeman@amat.com'
> > Cc: si-list@silab.Eng.Sun.COM
> > Subject: RE: [SI-LIST] : IC input impedance
> >
> > I would guess, the main harmonic of the clock, as it is at this frequency
> > that you will get the most amplitude loss.
> >
> > BTW, if you estimate the R in the equation I proposed, it may swarm the
> > value of 1/jwc in the overall impedance and make it negligible.
> >
> > Anybody, any other good ideas?
> >
> > Thanks,
> >
> > -Dima
> > ============================
> > Dima Smolyansky
> > Marketing and System Development
> > TDA Systems, Inc.
> > 7465 SW Elmwood St.
> > Portland, OR 97223
> > (503) 977-3629
> > (503) 245-5684
> > dima@tdasystems.com
> > http://www.tdasystems.com
> >
> >
> > -----Original Message-----
> > From: Shimon_Turgeman@amat.com [SMTP:Shimon_Turgeman@amat.com]
> > Sent: Tuesday, October 13, 1998 6:52 AM
> > To: Dima Smolyansky
> > Subject: RE: [SI-LIST] : IC input impedance
> >
> > what is the relevant frequency w of j*w*c?
> >
> >
> >
> >
> >
> > Dima Smolyansky <dima@tdasystems.com> on 10/13/98 05:44:33 PM
> >
> > To: "'Shimon_Turgeman@amat.com'" <Shimon_Turgeman@hermes.mis.amat.com>,
> > "si-list@silab.Eng.Sun.COM" <si-list@silab.Eng.Sun.COM>
> > cc: (bcc: Shimon Turgeman/AME/APPLIED MATERIALS)
> > Subject: RE: [SI-LIST] : IC input impedance
> >
> >
> >
> >
> > I suppose, R+1/j*w*c?
> >
> > Thanks,
> >
> > -Dima
> > ============================
> > Dima Smolyansky
> > TDA Systems, Inc.
> > 7465 SW Elmwood St.
> > Portland, OR 97223
> > (503) 977-3629
> > (503) 245-5684
> > dima@tdasystems.com
> > http://www.tdasystems.com
> >
> >
> > -----Original Message-----
> > From: Shimon_Turgeman@amat.com [SMTP:Shimon_Turgeman@amat.com]
> > Sent: Tuesday, October 13, 1998 12:55 AM
> > To: si-list@silab.Eng.Sun.COM
> > Subject: [SI-LIST] : IC input impedance
> >
> > what is the input impedance of CMOS devices (for calculating the
> > reflection
> > coff.)as a function of input capacitance ? how I calculate this impedance
> > ?
> > what is the formula ?
> >
> > Best Regards
> > Shimon Turgeman
> > Applied Materials
> >
> >
> >
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