Title:
DYNAMIC ADJUSTMENT OF A RESPONSE CHARACTERISTIC OF A PHASE-LOCKED LOOP DIGITAL FILTER
Document Type and Number:
WIPO Patent Application WO/2017/218085
Kind Code:
A3
Abstract:
An example phase-locked loop (PLL) includes a digital filter, an oscillator, and a time-to-digital converter (TDC). The digital filter is configured to sample at a discrete time that is responsive to a reference clock signal received at the digital filter. The oscillator is coupled to the digital filter and configured to generate an output signal of the PLL. The TDC is coupled to the oscillator to determine a phase difference between the output signal and the reference clock signal. The TDC also provides a time signal to the digital filter that is based on the phase difference and is representative of an instantaneous rate of operation of the PLL. The digital filter is further configured to adjust a response characteristic of the digital filter according to the time signal.
Inventors:
WIKLUND MAGNUS OLOV (US)
LOPELLI EMANUELE (US)
WANG CHARLES (US)
MOFIDI MAHBOD (US)
LOPELLI EMANUELE (US)
WANG CHARLES (US)
MOFIDI MAHBOD (US)
Application Number:
PCT/US2017/030769
Publication Date:
April 05, 2018
Filing Date:
May 03, 2017
Export Citation:
Assignee:
QUALCOMM INC (US)
International Classes:
H03L7/093; H03C3/09; H03L7/085; H03L7/091; H04L7/00; H04L7/033
Foreign References:
| US20160020775A1 | 2016-01-21 | |||
| US20060140322A1 | 2006-06-29 | |||
| US20060038710A1 | 2006-02-23 |
Other References:
MUHAMMAD FAISAL ET AL: "An automatically placed-and-routed ADPLL for the medradio band using PWM to enhance DCO resolution", RADIO FREQUENCY INTEGRATED CIRCUITS SYMPOSIUM (RFIC), 2013 IEEE, IEEE, 2 June 2013 (2013-06-02), pages 115 - 118, XP032443919, ISBN: 978-1-4673-6059-3, DOI: 10.1109/RFIC.2013.6569537
Attorney, Agent or Firm:
CICCOZZI, John L. et al. (US)
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