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RF VCO varactor

Question asked by dmitriy00 on Jun 30, 2017
Latest reply on Jul 3, 2017 by Vinod

Hi. Could the team of the AD9361 experts, please, answer the following about the RF VCOs:

1. What is the relationship between the settings of 0x239 and 0x251 and the actual Kv of the RF VCOs? What is the function of 0x251 register?

2. What is the range of the internal Vtune signal? if I want to monitor this voltage with the register bit, is the true Vtune output on EXT_LO pin? I noticed that the voltage always tries to be between 600mV and 750mV. Is that the target range?

3. The user guide says that VCO Output level, bits [D3:D0] of 0x23A affect the phase noise performance? How is it derived? What is a trade-off besides the power consumption?