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A stabilization technique for phase-locked frequency synthesizers

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2 Author(s)
Tai-Cheng Lee ; Dept. of Electr. Eng., Univ. of California, Los Angeles, CA, USA ; Razavi, B.

A stabilization technique is presented that relaxes the tradeoff between the settling speed and the magnitude of output sidebands in phase-locked frequency synthesizers. The method introduces a zero in the open-loop transfer function through the use of a discrete-time delay cell, obviating the need for resistors in the loop filter. A 2.4-GHz CMOS frequency synthesizer employing the technique settles in approximately 60 μs with 1-MHz channel spacing while exhibiting a sideband magnitude of -58.7 dBc. Designed for Bluetooth applications and fabricated in a 0.25-μm digital CMOS technology, the synthesizer achieves a phase noise of -112 dBc/Hz at 1-MHz offset and consumes 20 mW from a 2.5-V supply.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:38 ,  Issue: 6 )

Date of Publication:

June 2003

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