By Topic

A 7.1mW 10GHz all-digital frequency synthesizer with dynamically reconfigurable digital loop filter in 90nm CMOS

Sign In

Cookies must be enabled to login.After enabling cookies , please use refresh or reload or ctrl+f5 on the browser for the login options.

Formats Non-Member Member
$33 $13
Learn how you can qualify for the best price for this item!
Become an IEEE Member or Subscribe to
IEEE Xplore for exclusive pricing!
close button

puzzle piece

IEEE membership options for an individual and IEEE Xplore subscriptions for an organization offer the most affordable access to essential journal articles, conference papers, standards, eBooks, and eLearning courses.

Learn more about:

IEEE membership

IEEE Xplore subscriptions

2 Author(s)
Song-Yu Yang ; Nat. Chiao Tung Univ., Hsinchu, Taiwan ; Wei-Zen Chen

ADPLL frequency synthesizers have recently drawn significant research attention as the technology paradigm shifts into the nanometer CMOS arena. They circumvent several design issues that conventional charge-pump-based PLLs encounter, including capacitor leakage, current mismatch, and limited dynamic range. Furthermore, they benefit from replacing the bulky passive loop filter by a more cost-effective and flexible digital filter. The architecture of the presented ADPLL is composed of a dual-mode PFD, a PI digital loop filter composed of programmable integral (alpha) and proportional (beta) paths, a locking process monitor (LPM), an LC-based DCO, a divide-by-4 prescaler, and two phase accumulators PAC1 and PAC2. The PAC1 accumulates quarter of the frequency multiplication factor (N/4) while PAC2 accumulates the prescaler output phase. The phase difference (PhiE) between fREF and fOUT/N is then resolved by a subtractor. The dual-mode PFD is operated in the linear mode during frequency acquisition, and is turned into binary mode during the phase tracking process.

Published in:

Solid-State Circuits Conference - Digest of Technical Papers, 2009. ISSCC 2009. IEEE International

Date of Conference:

8-12 Feb. 2009