Poly-phase filter

Details Poly-phase filter Poly-phase filter

2007-10-17

2010-12-28

Phu, Sanh D (Department: 2618)

Telecommunications

Receiver or analog modulated signal frequency converter

Noise or interference elimination

C455S285000, C455S140000, C455S197200, C455S302000, C455S306000, C329S339000

Reexamination Certificate

active

07860478

ABSTRACT:
Provided is a poly-phase filter capable of removing an image frequency of a terrestrial digital multimedia broadcasting (T-DMB) receiver in a low intermediate frequency (IF) structure applied to a mobile communication terminal and a receiver having the poly-phase filter. The poly-phase filter includes: a calibration control block for generating first and second filter characteristic control signals which determine electrical characteristics of the filter in response to a control signal including instructions for changing the characteristics of the poly-phase filter and holding the changed values; and a poly-phase filter block for performing filtering on a plurality of input signals having different phases from each other in response to the first and second filter characteristic control signals. Accordingly, the poly-phase filter has advantages of having constant electrical characteristics regardless of changes in a manufacturing process and temperature and a high-performance image rejection function.

REFERENCES:
patent: 7084678 (2006-08-01), van Zeijl
patent: 7405613 (2008-07-01), De Ruijter
patent: 7426377 (2008-09-01), Tanaka et al.
patent: 2002/0168952 (2002-11-01), Vishakhadatta et al.
patent: 2006/0178125 (2006-08-01), Chae et al.
patent: 2008/0132191 (2008-06-01), Quinlan et al.

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