Details

Autor(en) / Beteiligte

• Vercesi, L.
• Fanori, L.
• De Bernardinis, F.
• Liscidini, A.
• Castello, R.

Titel

A dither-less all digital PLL for cellular transmitters

Ist Teil von

• 2011 IEEE Custom Integrated Circuits Conference (CICC), 2011, p.1-8

Ort / Verlag

IEEE

Erscheinungsjahr

2011

Quelle

IEEE Electronic Library Online

Beschreibungen/Notizen

• Frequency synthesizer for cellular transmitters demands low phase-noise both in-band and out-of-band. The first is necessary to implement wideband modulations (e.g. WCDMA), while the second to satisfy the challenging emission mask of GSM. Moreover a low level of fractional spurs must be ensured. The paper describes the first dither-less ADPLL capable to satisfy all these requirements. These results are achieved exploiting a highly linear 2-dimension Vernier TDC and a very fine frequency resolution DCO. Both building blocks heavily rely on digital calibration techniques to precisely and efficiently implement two-point modulation and spur cancellation in the presence of many implementation impairments.