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. 27, 2007
Filed:
Dec. 07, 2004
Kyung Whan Kim, Seoul, KR;
Kyung Whan Kim, Seoul, KR;
Hynix Semiconductor Inc., Kyoungki-do, KR;
Abstract
An oscillator operates with a variable driving voltage to produce an oscillation signal of a predetermined period in a semiconductor device. The oscillator has a plurality of logic devices connected to each other in a form of a ring. The oscillator includes a voltage generating circuit for generating first and second driving voltages which are selectively applied to the logic devices. The selective application of the first or second driving voltage to the logic devices affects the period of the oscillation signal produced. The first driving voltage is applied to the logic devices for normal operations when the oscillation signal period is tested to substantially equal the predetermined period. The second driving voltage is applied to the logic devices for normal operations when the oscillation signal period is tested to be different from the predetermined period. The second driving voltage is adjusted by changing the resistance ratio of at least two resistors in the circuit.