Integrated temperature sensor
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United States of America Patent
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Feb 1, 2000
Grant Date -
N/A
app pub date -
Apr 29, 1998
filing date -
Jun 2, 1997
priority date (Note) -
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Abstract
An integrated temperature sensor circuit (9) comprises two different current sources (14 and 15) multiplexed using switches (12 and 13) controlled by Clocks 1 and 2 having opposite phases into a bipolar transistor 11. V.sub.be is developed on capacitor (23) during the first clock phase and .DELTA.V.sub.be is developed on capacitor (23) during the second clock phase. A second capacitor (27) is coupled between the input and output of an operational amplifier (25). The second capacitor (27) is discharged during the first clock phase and is charged during the second clock phase. Since .DELTA.V.sub.be is dependent on temperature, the voltage at the output of the operational amplifier (25) is dependent on the temperature and the ratio of the two capacitors.
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