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(Sub-circuit A): The equivalent circuit model of the CDR; (Sub-circuit B): Circuit used to compensate for the parasitic capacitance present; (Sub-circuit C): Current to voltage converter, nominal value of Rf is 100 Ω; (Sub-circuit D): A current feedback scheme is used to increase the Q of the system; (Sub-circuit E): A digital lock-in amplifier arrangement (Zurich HF2) is used to track the resonant frequency.
