US 12,431,908 B2
Electronic devices having wireless transceivers with reference clock selection
Thomas Mayer, Linz (AT); Christian Wicpalek, Puchenau (AT); Juergen Koechl, Linz (AT); and Jongmin Park, San Diego, CA (US)
Assigned to Apple Inc., Cupertino, CA (US)
Filed by Apple Inc., Cupertino, CA (US)
Filed on May 4, 2023, as Appl. No. 18/312,393.
Prior Publication US 2024/0372555 A1, Nov. 7, 2024
Int. Cl. H03L 7/093 (2006.01); H03L 7/099 (2006.01); H04B 1/30 (2006.01)
CPC H03L 7/093 (2013.01) [H03L 7/0996 (2013.01); H04B 1/30 (2013.01); H04B 2001/307 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An electronic device comprising:
an antenna;
a first mixer communicatively coupled to the antenna and configured to convert a signal between a first frequency and a second frequency based on a first clock signal;
a second mixer communicatively coupled between the first mixer and the antenna and configured to convert the signal between the second frequency and a third frequency based on a second clock signal at a higher frequency than the first clock signal;
a reference oscillator;
a first phase-locked loop (PLL) having an input coupled to an output of the reference oscillator;
a second PLL having an input coupled to an output of the first PLL and configured to generate the second clock signal;
a third PLL configured to generate the first clock signal; and
a switch having a first terminal coupled to the output of the reference oscillator, a second terminal coupled to the output of the first PLL, and a third terminal coupled to an input of the third PLL.