US 11,855,649 B2
Spur cancellation for spur measurement
Timothy A. Monk, Hudson, NH (US); and Rajesh Thirugnanam, Nashua, NH (US)
Assigned to Skyworks Solutions, Inc., Irvine, CA (US)
Filed by Skyworks Solutions, Inc., Irvine, CA (US)
Filed on Aug. 11, 2021, as Appl. No. 17/399,981.
Application 17/399,981 is a continuation of application No. 16/018,598, filed on Jun. 26, 2018, granted, now 11,095,295.
Prior Publication US 2022/0077863 A1, Mar. 10, 2022
This patent is subject to a terminal disclaimer.
Int. Cl. H03L 7/093 (2006.01); G01R 29/26 (2006.01); G04F 10/00 (2006.01); G01R 31/317 (2006.01)
CPC H03L 7/093 (2013.01) [G01R 29/26 (2013.01); G01R 31/31727 (2013.01); G04F 10/005 (2013.01)] 15 Claims
OG exemplary drawing
 
1. A method of determining a presence of a spurious tone in a signal, the method comprising:
receiving an indication of a first frequency corresponding to a spurious tone to be measured in a first signal;
generating a second signal in a phase-locked loop based on the first signal and a feedback signal;
determining a presence of the spurious tone in the second signal based on scale factors of a spur cancellation signal;
determining a first magnitude of the spurious tone in the second signal based on the scale factors of the spur cancellation signal; and
dividing the first magnitude of the spurious tone in the second signal, which was determined based on the scale factors of the spur cancellation signal, by a plurality of gain factors to determine a second magnitude of the spurious tone in the first signal.