Ratio meter of a thermal sensor
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United States of America Patent
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Apr 10, 2018
Issued Date -
N/A
app pub date -
May 12, 2015
filing date -
Jan 30, 2013
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Abstract
A thermal sensor comprises a converter circuit, a counting circuit, and a ratio calculator. The converter circuit is configured to convert a temperature-independent signal into a first frequency signal, and to convert a temperature-dependent signal into a second frequency signal. The counting circuit is configured to receive at least one of the first frequency signal and the second frequency signal, to count a predetermined number of pulses of the first frequency signal, and to count a number of pulses of the second frequency signal for a time period corresponding to the counting of the predetermined number of pulses of the first frequency signal. The ratio calculator is configured to calculate a ratio based on the predetermined number of pulses of the first frequency signal and the counted number of pulses of the second frequency signal.
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