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:
Sep. 18, 2007
Filed:
Aug. 22, 2005
Kanyu Mark Cao, Cupertino, CA (US);
Yiping Fan, Fremont, CA (US);
Hongyu LI, Cupertino, CA (US);
Chieh-yuan Chao, Fremont, CA (US);
Kanyu Mark Cao, Cupertino, CA (US);
Yiping Fan, Fremont, CA (US);
Hongyu Li, Cupertino, CA (US);
Chieh-Yuan Chao, Fremont, CA (US);
Mediatek, Inc., Hsin-Chu, TW;
Abstract
The present invention provides methods and apparatuses for a polyphase filter, comprising: a first and second cascoded differential amplifiers configured to receive a first and second differential signals, the first cascoded differential amplifier having a first resistor coupled between current legs of the first cascoded differential amplifier and the second cascoded differential amplifier having a first capacitor coupled between current legs of the second cascoded differential amplifier; and a third and fourth cascoded differential amplifiers configured to receive said first and said second differential signals, the third cascoded differential amplifier having a second resistor coupled between current legs of the third cascoded differential amplifier and the fourth cascoded differential amplifier having a second capacitor coupled between current legs of the fourth cascoded differential amplifier; wherein the first and second cascoded differential amplifiers are configured to provide a first differential output in response to the first and second differential signals and the third and fourth cascoded differential amplifiers are configured to provide a second differential output in response to the first and second differential signals.