Temperature compensation for trans-hybrid loss in a miniaturized

Details Temperature compensation for trans-hybrid loss in a miniaturized Temperature compensation for trans-hybrid loss in a miniaturized

1995-02-27

1996-04-09

Hofsass, Jeffery

Telephonic communications

Subscriber line or transmission line interface

Hybrid circuit

379345, 379403, 379404, 379399, 379398, H04M 176

Patent

active

055069002

ABSTRACT:
Method and apparatus for temperature compensation of transhybrid loss in a data access arrangement (DAA) is provided. A thermal compensation device is situated in proximity to a thermally sensitive device. If devices which dissipate substantial power cause heating of the thermally sensitive device and change its characteristics, the thermal compensation device is also heated and compensates for the changes. Thus, a DAA that is unaffected by temperature changes and self-heating is provided. The DAA is suitable for use with data communications equipment utilizing echo cancelling circuitry, such as CCITT V.32 and V.32 bis modems. When used with such modems, the present invention avoids the need to perform retraining and equalization during changes in DAA operating temperature.

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