im been tryin 2 analysed te cct tat given in berzhad razavi book's ...4 stage differential ring type of vco...after sum proper biasing, i got sum oscillation...but i wanna knw how 2 measure te oscillation n is te cct rely oscillate as it is given in te books...Can somebody tel me how 2 anlaysed te waveforms...i've attached my waveforms...Thanks in advance !!!!