On chip noise tolerant temperature sensing circuit
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United States of America Patent
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May 25, 1993
Grant Date -
N/A
app pub date -
Dec 13, 1991
filing date -
Dec 13, 1991
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A novel on-chip temperature sensing circuit includes a differential voltage source which comprises a plurality of branches each of which is provided with temperature sensitive transistor means. The differential output from the differential voltage source is coupled to the inputs of a high gain differential amplifier and the outputs from the high gain differential amplifier are connected to a second stage differential amplifer and one of the branches of the second stage differential amplifier is coupled to a high gain transistor amplifier which is connected to an output pin on the semiconductor chip so that the signal at the output pin is a noise tolerant voltage indication of the temperature of said semiconductor chip which may be monitored during actual online operations. A hysteresis feedback may be coupled between one of the outputs of the differential amplifiers to provide a hysteresis feedback loop and rapid switching of the second differential amplifier.
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