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:
Feb. 14, 2012
Filed:
Jan. 20, 2011
Tsuyoshi Shiobara, Chitose, JP;
Tsuyoshi Shiobara, Chitose, JP;
Nihon Dempa Kogyo Co., Ltd, Tokyo, JP;
Abstract
Disclosed is a PLL oscillator circuit capable of examining an unlock state while being equipped with an auto retry function enabling automatic relock. In the PLL oscillator circuit, a MPU receives a lock detection signal from the PLL-IC that receives an external reference signal and an output signal from a VCXO and outputs a control voltage to the VCXO, sets data for unlock alarm test at the PLL-IC, the data turning a lock state into an unlock state, when determining an unlock state with the lock detection signal from the PLL-IC, outputs an unlock alarm output signal to the outside, determines whether the unlock state continues for a first time period, and when the unlock state continues for the first time period, executes retry to set data for relock at the PLL-IC.