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Fast frequency acquisition phase-frequency detectors for Gsamples/s phase-locked loops
Mansuri, M.; Liu, D.; Yang, C.-K.K.;
Solid-State Circuits, IEEE Journal of
Volume 37,
Issue 10,
Oct. 2002
Page(s):1331
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1334
Abstract:
This paper describes two techniques for designing phase-frequency detectors (PFDs) with higher operating frequencies [periods of less than 8× the delay of a fan-out-4 inverter (FO-4)] and faster frequency acquisition. Prototypes designed in 0.25-μm CMOS process exhibit operating frequencies of 1.25 GHz [=1/(8·FO-4)] and 1.5 GHz [=1/(6.7·FO-4)] for two techniques, respectively, whereas a conventional PFD operates at <1 GHz [=1/(10·FO-4)]. The two proposed PFDs achieve a capture range of 1.7× and 1.4× the conventional design, respectively.
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