in michael perot lectures, he said:
"Since VCO operates over a very narrow band of
frequencies, we can always do series to parallel
transformations to achieve a parallel network for
analysis"
why??, in rf microelectronics book of razavi, page 51, he discuss impedence transformation, but i didnt realize why narrow band condition????
I think it is because ω*L/R should be a value typically greater than 3 for nonolithic inductors, and this can only be satisfied by a narrow band of frequencies.