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:
Apr. 23, 2013
Filed:
Jul. 13, 2010
Seong-heon Jeong, Seongnam, KR;
Myung-woon Hwang, Seongnam, KR;
Seong-Heon Jeong, Seongnam, KR;
Myung-Woon Hwang, Seongnam, KR;
FCI Inc., Gyeonggi-Do, KR;
Abstract
The present invention relates to a direct current (DC) offset suppression circuit to suppress DC offsets occurring when a communication circuit where a complex filter is adopted performs self-mixing. The DC offset is suppressed by a DC feedback circuit adopted by a filter which is substituted for a complex filter in the communication circuit. But, the DC offset cannot be suppressed when a complex filter is used in the communication circuit. It is because phase changes of the complex filter cause output signal fed back to the input of the complex filter to generate phase differences. The present invention includes a phase compensation unit and a DC feedback unit. The phase compensation unit compensates a change in frequency between input and output of the complex filter for phase compensation. The DC feedback unit inverses and feeds back the compensated phase to an input of the complex filter.