Robust trimming scheme for low power RC oscillator compatible with high temperature operation
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United States of America Patent
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Oct 22, 2019
Grant Date -
Aug 2, 2018
app pub date -
Feb 2, 2017
filing date -
Feb 2, 2017
priority date (Note) -
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Abstract
In some embodiments, the present disclosure relates to a frequency generator having a resistor network and a capacitor network. The capacitor network has a plurality of capacitors connected in parallel with one another. A comparator is configured to output an oscillating voltage signal. An input of the comparator is connected to the output of the resistor network and the output of the capacitor network. A frequency testing circuit is configured to calculate a frequency of the oscillating voltage signal and determine whether the frequency is within a range of an expected frequency. The frequency testing circuit may also be configured to selectively connect a first plate of the plurality of capacitors to a non-varying voltage or to the input of the capacitor network to adjust a frequency of the oscillating voltage signal.
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