US 12,261,568 B2
Controlled application of hysteresis in crystal oscillator circuits
Anand Kumar Sinha, Noida (IN); Siyaram Sahu, Bari Raisen (IN); Ateet Omer, Kanpur (IN); Vishwajit Babasaheb Bugade, Kolhapur (IN); Harish Eleendram, Tirupati (IN); and Nagaraju Sunkara, Guntur (IN)
Assigned to NXP USA, Inc., Austin, TX (US)
Filed by NXP USA, Inc., Austin, TX (US)
Filed on Nov. 14, 2023, as Appl. No. 18/509,047.
Claims priority of application No. 202311038562 (IN), filed on Jun. 5, 2023.
Prior Publication US 2024/0405721 A1, Dec. 5, 2024
Int. Cl. H03B 5/36 (2006.01); H03B 5/06 (2006.01); H03K 3/037 (2006.01)
CPC H03B 5/364 (2013.01) [H03B 5/06 (2013.01); H03K 3/0377 (2013.01)] 20 Claims
OG exemplary drawing
 
1. An Integrated Circuit (IC), comprising:
an inverter comparator coupled to a crystal oscillator, wherein the inverter comparator is configured to: (i) receive an input of the crystal oscillator, and (ii) output a clock signal; and
a hysteresis control circuit coupled to the inverter comparator, wherein the inverter comparator is configured to: (i) start up with hysteresis disabled, and (ii) enable hysteresis in response to a hysteresis enable signal provided by the hysteresis control circuit.