Telecommunications – Receiver or analog modulated signal frequency converter – Noise or interference elimination
Reexamination Certificate
2007-03-13
2007-03-13
Urban, Edward F. (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Noise or interference elimination
C455S318000, C333S172000, C716S030000
Reexamination Certificate
active
10145443
ABSTRACT:
Disclosed are systems and methods which provide phase shifting of signals while minimizing signal attenuation associated with providing such phase shifting. Preferred embodiments provide a compact polyphase filter structure in which the geometry of the polyphase filter both minimizes parasitic capacitance and signal transmission paths therein. A polyphase filter of a preferred embodiment utilizes a radial pinwheel structure providing a geometry in which successive circuit components are disposed very near one another and in an orientation to accommodate very short connections therebetween. Embodiments may include the use of a buffer at the outputs of the polyphase filter circuit to reduce the amount of parasitics associated with the polyphase filter.
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Declaration of Pre-Filing Activity (attached as Exhibit “A”).
Fulbright & Jaworski LLP
Microtune ( Texas), L.P.
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