Miscellaneous active electrical nonlinear devices – circuits – and – Specific identifiable device – circuit – or system – Unwanted signal suppression
Reexamination Certificate
2007-09-18
2007-09-18
Le, Dinh T. (Department: 2816)
Miscellaneous active electrical nonlinear devices, circuits, and
Specific identifiable device, circuit, or system
Unwanted signal suppression
C455S302000
Reexamination Certificate
active
11209914
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.
REFERENCES:
patent: 6211708 (2001-04-01), Klemmer
patent: 6226509 (2001-05-01), Mole et al.
patent: 6636085 (2003-10-01), Okazaki et al.
patent: 6750715 (2004-06-01), Allott et al.
patent: 6831497 (2004-12-01), Koh et al.
patent: 6993310 (2006-01-01), Magnusen et al.
Cao Kanyu Mark
Chao Chieh-Yuan
Fan Yiping
Li Hongyu
Le Dinh T.
Mediatek Inc.
Thomas Kayden Horstemeyer & Risley
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