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

Citations Over TimeTop 16% of 2007 papers

Abstract

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, π], and saturates when the phase difference is in [π, 2π]. 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.

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