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A Dither-Less All Digital PLL for Cellular Transmitters

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5 Author(s)

An all-digital frequency synthesizer for cellular transmitter is presented. Low phase-noise is achieved both in-band and out-of-band exploiting a 2-dimensional Vernier time-to-digital converter and a dither-less digitally controlled oscillator. These building blocks heavily rely on digital calibration techniques to precisely and efficiently implement two-point modulation and spur cancellation in the presence of implementation impairments. The presented prototype shows an in-band phase noise of -108 dBc/Hz, an out-of-band phase noise of -160 dBc/Hz @20 MHz and in-band fractional spurs below -50 dBc. These results are obtained for an output carrier of 1.8 GHz, a reference clock of 26 MHz, with a power consumption of 41.6 mW.

Published in:

Solid-State Circuits, IEEE Journal of  (Volume:47 ,  Issue: 8 )

Date of Publication:

Aug. 2012

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