US 12,381,566 B2
Cross-coupled timing synchronization platform
Menno Spijker, Richmond Hill (CA); Michael Rupert, Richmond Hill (CA); Veronique Allard, Richmond Hill (CA); and Ketsana Souksanh, Richmond Hill (CA)
Assigned to Renesas Electronics America Inc., Milpitas, CA (US)
Filed by Renesas Electronics America Inc., Milpitas, CA (US)
Filed on Dec. 27, 2023, as Appl. No. 18/396,825.
Prior Publication US 2025/0219645 A1, Jul. 3, 2025
Int. Cl. H03L 7/197 (2006.01); H03L 7/195 (2006.01)
CPC H03L 7/1976 (2013.01) [H03L 7/195 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A semiconductor device comprising:
a first timing channel formed by an analog phase lock loop (APLL), a first digital phase lock loop (DPLL) and a first summation module; and
a second timing channel formed by a fractional output divider (FOD), a second digital phase lock loop (DPLL) and a second summation module, wherein:
the first summation module is configured to:
apply at least one operand on one or more of:
a first fractional frequency offset signal being outputted by the first DPLL, wherein the first fractional frequency offset signal is based on a feedback fractional frequency offset signal and a feedback of a first clock signal being outputted by the APLL, and the feedback fractional frequency offset signal is variable; and
a second fractional frequency offset signal being outputted by the second DPLL; and
sum results of the application of the at least one operand by the first summation module to generate a first signal that controls a frequency of the first clock signal being outputted by the APLL; and
the second summation module is configured to:
apply the at least one operand on one or more of:
the first fractional frequency offset signal being outputted by the first DPLL; and
the second fractional frequency offset signal being outputted by the second DPLL; and
sum results of the application of the at least one operand by the second summation module to generate a second signal that controls a frequency of a second clock signal being outputted by the FOD.