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Frequency Search Algorithm for Non-Linear Trim for RC Oscillators

Authored on: Apr 12, 2012 by Tarun Rehani, Randeep Singh Heer

Technical Paper

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Test engineers are assigned with the responsibility of trimming the RC Oscillator in a SoC to a particular frequency. However, for a non linear frequency trim, it could be a tricky thing to do. This white paper provides a new algorithm for frequency searching for the case of non linear trim. This paper also discusses non-linear frequency trim and the concept of frequency overlapping between different trim values. The algorithm presented here locates the correct frequency in a minimum number of cycles and hence saves a lot of time when hundreds of devices are to be trimmed.
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