A key design aspect of the MAX2870 is the bank of fundamental VCO’s with sub-bands that enables ultra-wideband operation. There are four individual VCO core blocks with a fundamental frequency range of 3000MHz to 6000MHz. Each VCO block has 16 sub bands. A state machine based VCO auto-select function is used to automatically select the correct VCO. Manual VCO selection is also possible with the appropriate register setting.