The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Sep. 13, 2011
Filed:
Jan. 28, 2010
Hector Sanchez, Cedar Park, TX (US);
Gayathri A. Bhagavatheeswaran, Austin, TX (US);
Xinghai Tang, Cedar Park, TX (US);
Hector Sanchez, Cedar Park, TX (US);
Gayathri A. Bhagavatheeswaran, Austin, TX (US);
Xinghai Tang, Cedar Park, TX (US);
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A method for a phase-locked loop (PLL) in an integrated circuit, wherein the PLL comprises a voltage-controlled oscillator (VCO). The method includes, in a training mode: (1) setting a control voltage of the VCO at a first voltage level; (2) increasing the control voltage of the VCO from the first voltage level to a second voltage level, until a loss of the feedback signal is detected; and (3) storing an indicator value corresponding to the second voltage level of the control voltage of the VCO. The method further includes, in a normal mode: (1) monitoring a voltage level of the control voltage of the VCO by generating a monitored indicator value corresponding to the voltage level of the control voltage of the VCO; and (2) asserting the loss of feedback signal based on a comparison of the monitored indicator value and the indicator value.