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A digitally controlled PLL for SoC applications

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2 Author(s)
Olsson, T. ; Lund Univ., Sweden ; Nilsson, P.

A fully integrated digitally controlled phase-locked loop (PLL) used as a clock multiplying circuit is designed and fabricated. The PLL has no off-chip components and it is made from standard cells found in most digital standard cell libraries. The design is, therefore, portable between technologies as an IP block. Using a 0.35-μm standard CMOS process and a 3.0-V supply voltage, the PLL has a frequency range of 152 to 366 MHz and occupies an on-chip area of 0.07 mm2. In addition, the next version of this all-digital PLL is described in synthesizable VHDL code, which simplifies digital system simulation and change of process. A new time-to-digital converter with higher resolution is designed for the improved PLL. An improved digitally controlled oscillator is also suggested.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:39 ,  Issue: 5 )