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Signal Delay Tuning by Magnetic Rods

IP.com Disclosure Number: IPCOM000119362D
Original Publication Date: 1991-Jan-01
Included in the Prior Art Database: 2005-Apr-01
Document File: 1 page(s) / 39K

Publishing Venue

IBM

Related People

Stadler, EE: AUTHOR [+2]

Abstract

This article describes a method of controlling and adjusting the signal delays of signal lines on a printed circuit card.

This text was extracted from an ASCII text file.
This is the abbreviated version, containing approximately 100% of the total text.

Signal Delay Tuning by Magnetic Rods

      This article describes a method of controlling and
adjusting the signal delays of signal lines on a printed circuit
card.

      As shown schematically in the drawing, a magnetic rod is used
to increase the signal line inductance of printed circuits for delay
tuning.  The signal line is placed on top of the card surface in a
channel by itself.  The rod is glued to the top of the signal line in
parallel thereto, so that the signal line inductance increases in the
section under the rod.  More than one rod can be installed to
increase the delay without any significant signal degradation.  This
method is an effective means for fine tuning clock signals.

      Various magnetic rods of different permeability can be used to
multiply the signal line inductance in continuous increments, which
results in continuous delay increments for fine tuning.

      The rod can be placed along the signal line at any location
where the signal line extends across the external plane as a single
line for each channel.

      In addition to delay tuning, the rod can be used as a signal
conditioning device, since it provides some low-pass filter action
which improves the signal-to-noise ratio if located in the most
effective place along the signal line path.

      The rod can be glued to a signal line by a particular glue that
cures in seconds.