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:
Jun. 24, 2014
Filed:
May. 15, 2013
Samaksh Sinha, Singapore, SG;
Niti Gupta, Noida, IN;
Sunny Gupta, Noida, IN;
Freescale Semiconductor, Inc., Austin, TX (US);
Abstract
A system for generating a clock signal includes a phase-locked loop (PLL) and a voltage storage circuit. The PLL includes a voltage-controlled oscillator (VCO) that generates a clock signal based on a control voltage. The voltage storage circuit includes a unity-gain amplifier (UGA) and first, second and third switches. The first switch connects an input terminal of the UGA and an input of the VCO to sample the control voltage before the PLL transitions from RUN mode to STOP mode. The second switch connects the input and output terminals of the UGA to store the sampled control voltage when the PLL is in STOP mode. The third switch connects the output terminal of the UGA to the input terminal of a low pass filter (LPF) to provide the stored control voltage to the LPF when the PLL transitions from the STOP mode to the RUN mode.