US 12,425,032 B1
Ring voltage controlled oscillator-based phase locked loop with dual charge pump architecture
Prakash Kumar Lenka, Orissa (IN); Sumit Gupta, Madhya Pradesh (IN); Vinod Kumar, Uttar Pradesh (IN); Jitendra Kumar Yadav, Bhopal (IN); Virvasav Sinha, Bengaluru (IN); and Rajashekhar Krishnamurthy Rao, Bangalore (IN)
Assigned to Cadence Design Systems Inc., San Jose, CA (US)
Filed by Cadence Design Systems, Inc., San Jose, CA (US)
Filed on Sep. 27, 2023, as Appl. No. 18/475,676.
Int. Cl. H03L 7/099 (2006.01); H03L 7/089 (2006.01)
CPC H03L 7/0995 (2013.01) [H03L 7/0891 (2013.01)] 18 Claims
OG exemplary drawing
 
1. A ring voltage-controlled oscillator based phase locked loop circuit comprising:
an integral path including a plurality of resistors and a plurality of transistors configured to correct low frequency variations;
a proportional path in electrical communication with the integral path, the proportional path including a plurality of transistors and a source degeneration circuit, wherein the source degeneration circuit includes a programmable resistor; and
a decoupling capacitor located at a ring voltage-controlled oscillator node in electrical communication with the proportional path, wherein the source degeneration circuit operates to cancel any effect from the ring voltage-controlled oscillator node.