Constant offset buffer for reducing sampling time in a semiconductor temperature sensor
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United States of America Patent
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Oct 28, 2003
Grant Date -
N/A
app pub date -
Jan 16, 2002
filing date -
Sep 27, 2001
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Abstract
A data acquisition system for sampling a temperature signal from a temperature sensor includes: a programmable current source, a buffer with a constant offset, and an analog-to-digital converter (ADC). The programmable current source selectively provides bias currents to the temperature sensor, which produces response voltages in response to the applied bias current. The buffer receives the response voltages and produces buffered response voltages that include a constant offset. The ADC is arranged to produce digital codes in response to the buffered response voltages. The digital codes are used to determine a temperature associated with the temperature sensor. The buffer isolates the temperature sensor from the ADC such that loading effects are minimized and set-up times for the conversion are minimized.
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