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ad9364 vtune voltage linearity

Question asked by padma@1969 on Mar 26, 2017

    We are trying to analyze the RFvco performance by monitoring the  VTune voltage at Ext LO pin.But it is not linear with the frequency. We are changing the frequency linearly from 13GHZ to 1.5GHz with10mhz step.we are using no-os drivers and FMCOMMSZ4

.We would like to know why it is not linear.pease clarify.At some freuencies it is fluctuating  also.