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:
Aug. 28, 2007
Filed:
Dec. 04, 2003
Tung-ming Su, Kao-Hsiung Hsien, TW;
Tung-Ming Su, Kao-Hsiung Hsien, TW;
Realtek Semiconductor Corp., HsinChu, TW;
Abstract
A first local oscillator operating at a first frequency provides a first reference signal and a second reference signal. The second reference signal is the first reference signal phase shifted by 90 degrees. A first harmonic mixer has inputs coupled to a received RF signal, the first reference signal, and the second reference signal. A band-pass filter is coupled to an output of the first harmonic mixer. A second local oscillator operates at a second frequency and provides a third, a fourth, a fifth, and a sixth reference signal, which are phase shifted by 0 degrees, 45 degrees, 90 degrees, and 135 degrees, respectively. A second harmonic mixer has inputs coupled to an output of the band-pass filter, the third reference signal, and the fifth reference signal. A third harmonic mixer has inputs coupled to the output of the band-pass filter, the fourth reference signal, and the sixth reference signal.