Bias current generator having blended temperature response
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United States of America Patent
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Apr 17, 2018
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app pub date -
Dec 2, 2016
filing date -
Dec 8, 2015
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Abstract
Bias current generator circuitry includes a first current source having a first temperature sensitivity characteristic, a second current source having a second temperature sensitivity characteristic, and temperature-sensitive control circuitry configured to select, as an output of the bias current generator circuitry, an output of the first current source when circuitry temperature is in a first temperature range, and an output of the second current source when circuitry temperature is in a second temperature range. In an example, the first temperature sensitivity characteristic is temperature independence and the second temperature sensitivity characteristic is proportionality to temperature. The control circuitry includes a third current source having the first temperature sensitivity characteristic, a fourth current source having the second temperature sensitivity characteristic. Comparison circuitry is configured to compare an output of the third current source and an output of the fourth current source, to select between the first and second current sources.
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