Electricity: electrical systems and devices – Safety and protection of systems and devices – With specific current responsive fault sensor
Reexamination Certificate
2005-02-01
2005-02-01
Berhane, Adolf (Department: 2838)
Electricity: electrical systems and devices
Safety and protection of systems and devices
With specific current responsive fault sensor
Reexamination Certificate
active
06850398
ABSTRACT:
An integrated, programmable, feed forward current controller supplies a control current to control or compensate a drive current used to drive a device having a response that depends upon a physical parameter such as temperature. Control current compensation data are stored in a programmable look-up table as a function of the physical parameter. A transducer converts a measurement of the physical parameter into an electrical signal that is digitized and used to address the contents of the look-up table. The compensated control current stored in the look-up table is converted into an analog current and used to control or compensate a drive current used to drive the device under control, thereby minimizing the dependence of the device's response on the physical parameter.
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patent: 5019769 (1991-05-01), Levinson
patent: 5073838 (1991-12-01), Ames
patent: 5268800 (1993-12-01), Nielsen
patent: 6504350 (2003-01-01), Leonowich
Dallas Semiconductor, Editor: Patricia Greaves, “First Temperature-Compensated Resistors from Dallas Semiconductor Provide Laser Precision and Safety in Gigabit Optical Transceivers,” DS1847 & DS1848 Data Sheet, pp. 1-2, http://www.dalsemi.com
ews/pr/product/2000/1847.html, Oct. 16, 2000.
Dallas Semiconductor, “Preliminary DS1848, Dual Temperature-Controlled NV Variable Resistor & Memory,” pp. 1-16, www.dalsemi.com, Sep. 28, 2000.
Berhane Adolf
Townsend and Townsend / and Crew LLP
Xicor Inc.
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