US 12,451,876 B2
Asynchronous control of phase shift using an injection-locked-oscillator-based phase rotator
Yi-Chieh Huang, Zhubei (TW); Bo-Yu Chen, Taichung (TW); Po-Shuan Weng, Hsinchu (TW); and Ying Wei, San Jose, CA (US)
Assigned to NVIDIA Corporation, Santa Clara, CA (US)
Filed by NVIDIA Corporation, Santa Clara, CA (US)
Filed on Feb. 22, 2024, as Appl. No. 18/584,154.
Prior Publication US 2025/0274109 A1, Aug. 28, 2025
Int. Cl. H03K 5/01 (2006.01); H03K 19/20 (2006.01); H03K 5/00 (2006.01)
CPC H03K 5/01 (2013.01) [H03K 19/20 (2013.01); H03K 2005/00286 (2013.01)] 23 Claims
OG exemplary drawing
 
1. A circuit comprising:
a phase selector configured to generate an injection clock signal having an injection phase based on a present phase of a digitally controlled oscillator (DCO) clock signal generated within a phase-locking feedback loop;
an injection-locked oscillator (ILO) coupled to an output of the phase selector, wherein the ILO is to generate an ILO clock signal; and
logic coupled between an output of the ILO and the phase selector, the logic to, at each predetermined number of cycles of the DCO clock signal, cause the phase selector to output a phase shift in the injection clock signal that causes the ILO clock signal to comprise a rotated phase, relative to the injection phase.