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:
May. 26, 2009
Filed:
Apr. 24, 2007
Jung-hoon OH, Seoul, KR;
Jung-Hoon Oh, Seoul, KR;
Abstract
A fast locking phase locked loop includes a first phase frequency detector (PFD), a second PFD, a lock detector, an up-signal output unit, a down-signal output unit, a selective charge pump, a loop filter, and a voltage-controlled oscillator (VCO). The first PFD outputs a first up-signal and a first down-signal. The second PFD outputs a second up-signal and a second down-signal. The lock detector outputs an inverted lock signal. The selective charge pump outputs a pumping current. The loop filter generates a control voltage in response to the pumping current. The VCO generates the external clock signal having a frequency determined in accordance with the control voltage. The PLL has a faster locking time because the PFDs included in the PLL are capable of detecting a phase difference in a missing edge.