Electricity: electrical systems and devices – Housing or mounting assemblies with diverse electrical... – For electronic systems and devices
Patent
1998-12-11
2000-05-09
Picard, Leo P.
Electricity: electrical systems and devices
Housing or mounting assemblies with diverse electrical...
For electronic systems and devices
361707, 361715, 361717, 361718, 361719, 361738, 361761, 361766, 361760, 361777, 174250, 174252, 174260, H05K 720
Patent
active
06061241&
ABSTRACT:
A line circuit module is disclosed which comprises effectively all of the required circuitry for a line card apart from mechanical components such as relays and edge card connectors. The module includes a small ceramic substrate 2.0 inches by 0.825 inches on to which surface mount components which include a heat sensitive integrated circuit and a field effect transistor are mounted to one side and thick film components which include two battery feed resistors are printed on an opposite side. Various innovative techniques are disclosed which significantly reduce compromising component thermal interactions. Heat concerns from using a small thermally conductive substrate have been managed through advantageous use of printed battery feed resistor layouts which provide for larger portions of heat to be dissipated in resistor portions removed from a heat sensitive integrated circuit than resistor portions adjacent to the heat sensitive integrated circuit. Advantageous placement of feed resistor trim links to further manage heat dissipation are also disclosed. A line card which advantageously includes the line module is disclosed.
REFERENCES:
patent: 4498120 (1985-02-01), Kaufman
patent: 4879630 (1989-11-01), Boucard et al.
patent: 5367436 (1994-11-01), Ikei
patent: 5525763 (1996-06-01), Van Liere
Daniels Michael H.
Handforth Martin Ridgway
Majmudar Sudhir
Paterson Donald G.
Chervinsky Boris
Nortel Networks Corporation
Picard Leo P.
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