US 12,136,926 B2
Two point frequency search based PLL control
Animesh Paul, Bangalore (IN)
Assigned to TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed by TEXAS INSTRUMENTS INCORPORATED, Dallas, TX (US)
Filed on Nov. 22, 2022, as Appl. No. 17/992,701.
Claims priority of provisional application 63/418,339, filed on Oct. 21, 2022.
Prior Publication US 2024/0137028 A1, Apr. 25, 2024
Int. Cl. H03L 7/087 (2006.01); H03L 7/093 (2006.01); H03L 7/099 (2006.01)
CPC H03L 7/087 (2013.01) [H03L 7/093 (2013.01); H03L 7/0991 (2013.01)] 20 Claims
OG exemplary drawing
 
1. A phase-locked loop (PLL) circuit, comprising:
an oscillator configured to provide a clock signal;
a frequency search circuit configured to:
measure a first frequency of the clock signal, the first frequency associated with a first code;
measure a second frequency of the clock signal, the second frequency associated with a second code;
determine, based on the first frequency, the second frequency, the first code, and the second code, a slope value;
determine a third code based on the slope value and a target frequency; and
provide the third code to the oscillator; and
an analog control loop configured to control the oscillator to cause a frequency of the clock signal to converge to the target frequency.