Apparatus, system, and method of a digitally-controlled frequency multiplier

A device comprising:

• a frequency generator configured to generate a first frequency signal having a first frequency;
• a digitally-controlled frequency multiplier, controllable according to a digital control input, the digitally-controlled frequency multiplier configured to generate a second frequency signal having a second frequency, the digitally-controlled frequency multiplier configured to generate the second frequency signal by multiplying the first frequency of the first frequency signal, the digitally-controlled frequency multiplier comprising:
• a phase generator configured to generate a plurality of phase-shifted signal groups corresponding to a respective plurality of first phase-shifts applied to the first frequency signal, wherein a phase-shifted signal group corresponding to a first phase-shift of the plurality of first phase-shifts comprises a plurality of phase-shifted signals based on a respective plurality of second phase-shifts;
• a plurality of Digital Clock Multipliers (DCMs) controllable according to the digital control input to generate a respective plurality of frequency-multiplied signals based on the plurality of phase-shifted signal groups, wherein a frequency of the frequency-multiplied signals is based on a product of the first frequency and a count of the plurality of second phase-shifts;
• and
• a combiner to generate the second frequency signal based on a combination of the plurality of frequency-multiplied signals;
• and
• a Radio Frequency (RF) chain configured to process an RF signal based on the second frequency signal.

A method of generating an output frequency signal having an output frequency by multiplying an input frequency of an input frequency signal, the method comprising:

• generating a plurality of phase-shifted signal groups corresponding to a respective plurality of first phase-shifts applied to the input frequency signal, wherein a phase-shifted signal group corresponding to a first phase-shift of the plurality of first phase-shifts comprises a plurality of phase-shifted signals based on a respective plurality of second phase-shifts;
• generating a plurality of frequency-multiplied signals based on the plurality of phase-shifted signal groups, respectively, wherein a frequency of the frequency-multiplied signals is based on a product of the input frequency and a count of the plurality of second phase-shifts;
• and
• generating the output frequency signal based on a combination of the plurality of frequency-multiplied signals.