Nokia Corporation

Nokia Technologies Oy

Tapio Ilmari Rapinoja

Liangge Xu

Saska J Lindfors

Kari Stadius

Jussi Ryynanen

Risto H S Kaunisto

In some example embodiments, there may be provided an apparatus. The apparatus may include a delay line including a plurality of cells; and tuning circuitry coupled to the delay line and configured to generate a first output and a second output to tune the delay of the delay line, wherein the first output tunes in aggregate the plurality of cells of the delay line, and wherein the second output tunes each of the plurality of cells separately. Related methods, systems, and articles of manufacture are also disclosed.

All-digital delay-locked loop tuning method with randomized LSB-tuning

Described is an apparatus that includes a frequency source and a plurality of time domain direct digital synthesizers each having an input connected to an output of the frequency source and an output providing an output frequency signal. A particular time domain direct digital synthesizer includes a sigma-delta modulator that functions as a second order multi-stage noise shaping sigma-delta modulator. In one exemplary embodiment sigma-delta modulator outputs provide a unitary-weighted word used to switch certain unit capacitors that comprise part of a delay modulator to produce a time-varying delay having a time-averaged value that directly corresponds to a binary value appearing on a plurality of phase accumulator outputs.

Frequency synthesizer having a plurality of independent output tones

A method includes generating a plurality of reference phases of a reference signal and selecting a sub-phase from each of the plurality of reference phases to form a set of selected sub-phases. In the method selecting operates in response to synchronized outputs of a multi-phase phase accumulator that operates synchronously in accordance with one of the sub-phases of the set of sub-phases, and where the outputs of the multi-phase phase accumulator may be synchronized using at least one additional sub-phase.

Growing community of inventors

Kerava, Finland

Tapio Ilmari Rapinoja