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:
Dec. 30, 2008
Filed:
Feb. 01, 2006
Tae-hyoung Kim, Seongnam-si, KR;
Uk-rae Cho, Suwon-si, KR;
Tae-Hyoung Kim, Seongnam-si, KR;
Uk-Rae Cho, Suwon-si, KR;
Samsung Electronics Company, Ltd., Gyeonggi-Do, KR;
Abstract
Provided is an output impedance circuit, which has a constant output impedance regardless of a pad voltage, and an output buffer circuit including the output impedance circuit. The output impedance circuit includes an output stage and an impedance control stage. The output stage outputs a current corresponding to a DC bias voltage via an output terminal, and the impedance control stage controls the current flowing through the output stage in response to an output signal. The output stage includes a resistance component and a first MOS transistor. A first terminal of the resistance component is connected to the output terminal. A first terminal of the first MOS transistor is connected to a second terminal of the resistance component, a second terminal of the first MOS transistor is connected to a voltage source, and an input signal is input to a gate of the first MOS transistor.