Apparatus for minimizing optically and thermally induced noise in precision electronic components
US4636916A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | May 24, 1985 |
| Grant date | Jan 13, 1987 |
| Priority date | — |
| Expiry date | May 24, 2005 |
Classification
- Technology area (CPC H)Electricity
- CPC primaryH01L2924/0002
- WIPO fieldAudio-visual technology
- WIPO sectorElectrical engineering
Abstract
Method and apparatus for minimizing unpredictable sources of noise, or error voltages, at the microvolt level in precision analog components such as operational amplifiers is described. Sources of such error voltages are temperature gradients across the dice of the precision components enclosed in a hermetically sealed package, thermoelectric voltages caused by temperature differences between junctions of leads of the package with other metals, and light reflected from the substrate through the glass seals around the leads in the base of such packages. A skirted heat sink is positioned in thermal contact with the sides of the package which package is mounted on a substrate. The heat sink transfers heat from the heat sink to its ambient environment by radiation and convection to maintain the temperature within the package substantially constant. The skirt depending from the heat sink encloses the space between the base of the package and the surface of the substrate to form a substantially isothermal enclosure to maintain the temperature of the leads of the package substantially constant. The depending skirt also blocks, or absorbs, radiation from the ambient environment of the pack…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.