US 11,863,193 B2
Metastability correction for ring oscillator with embedded time to digital converter
Ryan Alexander Smith, Lucas, TX (US)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Jul. 29, 2021, as Appl. No. 17/389,240.
Prior Publication US 2023/0030425 A1, Feb. 2, 2023
Int. Cl. H03L 7/099 (2006.01); G04F 10/00 (2006.01); H03K 3/037 (2006.01); H03K 19/0175 (2006.01); H03M 7/16 (2006.01)
CPC H03L 7/0995 (2013.01) [G04F 10/005 (2013.01); H03K 3/037 (2013.01); H03K 19/017509 (2013.01); H03M 7/16 (2013.01); H03L 2207/50 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A system, comprising:
a phase locked loop comprising:
a set of inverters; and
a set of flops, wherein each flop of the set of flops is coupled to an output of a different inverter of the set of inverters; and
a decoder configured to:
receive a code from the set of flops, wherein the code represents a phase of the phase locked loop;
responsive to the code being invalid, decode the invalid code to a valid code; and
provide the valid code to a phase frequency detector.