The Time to digital converter (TDC) used in this project is composed of two parts for count the reference clock and DCO clock period.The proposed DCO employs a new approach to increase the delay tuning range using digitally controlled pass transistor arrays and Schmitt trigger-based inverters.Compared to the conventional DCO, the proposed DCO saves approximately 15% power consumption.However, this DCO design has a limited operating frequency range, which is improved in this project by employing the fixed delay blocks and 4:1 Mux which can give 4 times larger operating range. It work for multimode frequency. It capture different frequencies between 590 MHz to 840 MHz.
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