Re: [SI-LIST] : Schiffman phase shifters

Doug Day (day_d@sanjose.vlsi.com)
Sun, 28 Sep 1997 09:19:13 -0700

I believe that most u-wave and RF techniques tend to be much more narrow
band when compared to the spectrum of digital singals. This tends to limit
the applicability of those techniques for digital circuits.

**************************************************
Douglas Day
Applications Engineering Manager
High Speed Interface
Communications Products Division
VLSI Technology Inc.
TEL: 408-434-7660
FAX: 408-434-7866
*************************************************

> From esayre@nesa.com Sun Sep 28 07:49:14 1997
> X-Sender: esayre@mail.nesa.com
> Date: Sun, 28 Sep 1997 10:32:44 -0400
> To: si-list@silab.Eng.Sun.COM, Paul Galloway <pgjr@Cadence.COM>
> From: "Dr. Edward P. Sayre" <esayre@nesa.com>
> Subject: [SI-LIST] : Schiffman phase shifters
> Cc: baxter@nesa.com, chen@nesa.com, Edward Sayre <sayre@unix.cie.rpi.edu>
> Mime-Version: 1.0
>
> Paul:
>
> I used the Schiffman phase shifter to realize a constant 90 degree
> (lambda/4) vs. frequency design for a quadrature transceiver to generate
> circular polarization form two dipoles. The heavy interaction between the
> two sections causes a heavily loaded capacitive coupling over a given
> frequency range related to the length of the section. The work was done
> more than 30 years ago so the details are lost in the haze of history.
> However, these old and established methods, when updated to high
> performance digital interconnects and interpreted in terms of digital
> signaling, will be seen to be useful adjuncts to design.
>
> ed sayre
>
>
>
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