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Fast frequency acquisition phase-frequency detector with zero blind zone in PLL

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3 Author(s)
Hu, W. ; Univ. Town of Shenzhen, Shenzhen ; Chunglen, L. ; Wang, X.

A simple phase-frequency detector (PFD) is described. This circuit only has 16 transistors. This PFD has linear range when the phase difference is in [0, pi], and saturates when the phase difference is in [pi, 2pi]. It completely eliminates the blind zone, speeds up the acquisition process and improves the maximum operating frequency of the PFD. Both simulation and post-simulation with HSPICE confirm these advantages.

Published in:

Electronics Letters  (Volume:43 ,  Issue: 19 )