how 2 realised the ring arch. vco waveforms

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pnanda65675

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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 !!!!
 

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