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:
Oct. 16, 2007
Filed:
Mar. 15, 2006
Sung-pil Choi, Suwon-si, KR;
Do-youn Kim, Hwaseong-si, KR;
Jae-wook Kwon, Yongi-si, KR;
Abstract
An operational amplifier includes: a differential amplifier for differentially amplifying first and second differential input signals to generate first and second output signals through first and second nodes; a driver for driving an output node in response to the second output signal; and a drive current adjuster for adjusting a driving current of the driver in response to the first output signal. The drive current adjuster includes: a first transistor including a drain connected to the output node, a gate, and a source connected to a ground voltage; a second transistor including a gate connected to the first node, a drain, and a source connected to a source voltage; a third transistor including a drain connected to the drain of the second transistor, a source, and a gate connected to a first bias voltage; and a fourth transistor including a drain connected to the source of the third transistor, a source connected to the ground voltage, and a gate connected to a second bias voltage, wherein the gate of the first transistor is commonly connected to the drains of the second and third transistors.