Data processing: measuring – calibrating – or testing – Measurement system – Temperature measuring system
Reexamination Certificate
2006-07-25
2006-07-25
Barlow, John (Department: 2863)
Data processing: measuring, calibrating, or testing
Measurement system
Temperature measuring system
C327S512000, C374S178000
Reexamination Certificate
active
07082377
ABSTRACT:
A temperature measurement circuit for a dual junction temperature sensor is provided. The temperature measurement circuit is configured to provide separate bias currents to the junctions in the temperature sensor. The temperature measurement circuit includes two signal channels configured to provide an intermediate differential signal from a differential input signal that is received from the temperature sensor. Also, the temperature measurement circuit may include one or more multiplexer circuits that are configured to control the intermediate differential signal. The temperature sensor circuit further includes a control circuit configured to adjust the bias currents and to control the multiplexer circuits such that several different differential voltages can be provided by the signal channels. Additionally, the temperature measurement circuit includes a conversion circuit that is configured to convert the differential voltage to a temperature signal, and to perform error cancellation based on the different differential voltages provided by the signal channels.
REFERENCES:
patent: 6008685 (1999-12-01), Kunst
patent: 6149299 (2000-11-01), Aslan et al.
patent: 6612738 (2003-09-01), Beer et al.
Aslan Mehmet
Henderson Richard
Ren Qing Feng
Barlow John
Darby & Darby P.C.
Gaffney Matthew M.
Le John
National Semiconductor Corporation
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