Variable bandwidth tunable silicon duplexer

Details Variable bandwidth tunable silicon duplexer Variable bandwidth tunable silicon duplexer

2007-08-25

2010-11-02

Pascal, Robert (Department: 2817)

Wave transmission lines and networks

Plural channel systems

Having branched circuits

C333S126000, C333S129000

Reexamination Certificate

active

07825745

ABSTRACT:
A tunable duplexer using voltage-controlled varactors is presented. The center frequency, the pass band, and the stop band are each tunable to meet system requirements. A calibration circuit driving digital to analog converters produces the necessary voltages used in the resonant circuits. The tunable duplexer can be fabricated on a single silicon chip. On-chip transformers can be used to reduce the voltage level of signals in the filters to improve the linearity of the duplexer.

REFERENCES:
patent: 5029294 (1991-07-01), Kim
patent: 5786763 (1998-07-01), Canipe
patent: 6111482 (2000-08-01), Atokawa
patent: 7212789 (2007-05-01), Kuffner
patent: 7479846 (2009-01-01), Inoue et al.
patent: 2008/0231537 (2008-09-01), Rofougaran et al.

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