Trimmable circuitry for providing compensation for the temperature coefficients of a voltage controlled crystal-less oscillator
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United States of America Patent
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Oct 5, 1999
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N/A
app pub date -
Jul 31, 1997
filing date -
Jul 31, 1997
priority date (Note) -
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Abstract
In an integrated crystal-less device that generates an output signal with the frequency of the output signal dependent at least in part on a resistive element, there is provided circuitry for providing compensation for the temperature coefficient the of resistive element, the circuitry includes a bandgap reference and a resistive network. The bandgap reference utilizes components having stable temperature coefficient to generate a first voltage, a reference voltage, and also to generate second voltage, a voltage proportional to absolute temperature. The resistive network includes two trimmable resistors, which are trimmed such that the resistive network in combination with the bandgap reference compensates for the absolute value of the resistive element in a selected temperature range.
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