TUMA3: Faster frequency switching in Space qualified K-Band PLL

Presentation Abstract
Frequency hopping between multiple LO frequencies find application in downconverter and upconverter chain where switching time expected is very low. Frequency Switching time in PLL based synthesizers containing integrated VCOs/Multipliers is dominated by VCO/Multiplier calibration time. During the calibration time, output frequency can vary a lot, which is undesired. Proposed FULL ASSIST solution in LMX26xx reduces calibration time to zero by forcing the settings related to frequency switch, all at one go using double buffering registers and thus avoids cycle slipping. With this feature in LMX26xx, overall lock time depends only on minimal register writes and analog loop settling.