US 12,088,303 B1
Self-calibrated phase tuning system
Lu Wang, Chapel Hill, NC (US); and Yu Song, San Diego, CA (US)
Assigned to QUALCOMM INCORPORATED, San Diego, CA (US)
Filed by QUALCOMM Incorporated, San Diego, CA (US)
Filed on Feb. 23, 2023, as Appl. No. 18/173,679.
Int. Cl. G06F 1/06 (2006.01); H03K 5/01 (2006.01); H03K 5/00 (2006.01)
CPC H03K 5/01 (2013.01) [G06F 1/06 (2013.01); H03K 2005/00019 (2013.01); H03K 2005/00286 (2013.01)] 30 Claims
OG exemplary drawing
 
1. A clock generation apparatus comprising:
a delay circuit configured to output a first signal that is a delayed version of an input signal;
a phase selection circuit configured to receive the input signal and one or more phase-shifted versions of the input signal and to output a second signal that is a phase-shifted version of the input signal; and
a phase measurement circuit coupled to the first signal and the second signal, the phase measurement circuit providing a first output that is coupled to a phase control input of the phase selection circuit, the phase measurement circuit further providing a second output that is coupled to a delay control input of the delay circuit.