US 12,009,826 B1
Phase noise suppression for reference oscillator
Nikolay Shtin, Morgan Hill, CA (US); Oleksandr Chenakin, Morgan Hill, CA (US); and Suresh P. Ojha, Morgan Hill, CA (US)
Assigned to Anritsu Company, Morgan Hill, CA (US)
Filed by Anritsu Company, Morgan Hill, CA (US)
Filed on Nov. 8, 2022, as Appl. No. 17/983,253.
Int. Cl. H03L 7/093 (2006.01); H03L 7/099 (2006.01)
CPC H03L 7/093 (2013.01) [H03L 7/099 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A phase-noise-suppression system comprising:
an input path comprising a first voltage-controlled phase shifter in series with a frequency multiplier, the input path having an input configured to couple to a signal source external to the phase-noise suppression system;
a frequency discriminator having an input coupled to an output of the input path;
a first amplifier path having an input coupled to an output of the frequency discriminator and an output coupled to a control input of the first voltage-controlled phase shifter; and
a second amplifier path having an input coupled to the output of the frequency discriminator and an output coupled to a control input of the frequency discriminator.