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Pulsed Current Pyrolysis for Both Circuit Repair and Circuit Modification

IP.com Disclosure Number: IPCOM000108240D
Original Publication Date: 1992-May-01
Included in the Prior Art Database: 2005-Mar-22
Document File: 1 page(s) / 57K

Publishing Venue

IBM

Related People

Vigliotti, DR: AUTHOR [+2]

Abstract

Self-induced repair or SIR has been successfully applied to repair both near-open and open circuits (*). For the case of open circuits, it is first necessary to obtain an electrically conducting bridge. SIR is then applied as the second step to produce copper plate-up of the high resistance bridge. Generally, the preferred method for obtaining the bridge is to use Pd-acetate in a solvent, applied by spraying or local droplets in the region of the open circuit. After drying, the Pd-acetate is pyrolyzed using a scanned, focused laser beam to drive off the ligands in a local region, leaving behind a thin, narrow Pd strip or bridge. While this method is very successful, it suffers from the shortcoming that the laser must be directed locally and precisely at the region in need of pyrolysis.

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Pulsed Current Pyrolysis for Both Circuit Repair and Circuit Modification

       Self-induced  repair or SIR has been successfully applied
to repair both near-open and open circuits (*). For the case of open
circuits, it is first necessary to obtain an electrically conducting
bridge.  SIR is then applied as the second step to produce copper
plate-up of the high resistance bridge. Generally, the preferred
method for obtaining the bridge is to use Pd-acetate in a solvent,
applied by spraying or local droplets in the region of the open
circuit.  After drying, the Pd-acetate is pyrolyzed using a scanned,
focused laser beam to drive off the ligands in a local region,
leaving behind a thin, narrow Pd strip or bridge.  While this method
is very successful, it suffers from the shortcoming that the laser
must be directed locally and precisely at the region in need of
pyrolysis. This step requires laser alignment with respect to the
open circuit and means that the generally attractive self-aligning
feature of SIR is partially lost.

      We have demonstrated an alternative method of pyrolysis using
bursts of current, including amplitude ramped and high frequency
gated pulses to cause an electrically continuous path between the
ends of the open circuit via pyrolysis. The current is applied at the
ends of the circuit net in which the open is found.  While the
Pd-acetate is generally non-conducting, it can be made very slightly
conducting by applying a small amount of moi...