Wave transmission lines and networks – Coupling networks – Electromechanical filter
Reexamination Certificate
2006-04-18
2006-04-18
Wamsley, Patrick (Department: 2819)
Wave transmission lines and networks
Coupling networks
Electromechanical filter
C331S1170FE
Reexamination Certificate
active
07030718
ABSTRACT:
A tuning circuit for adjusting an oscillation frequency of an oscillator circuit. The tuning circuit comprises a film bulk acoustic wave resonator (FBAR) having a series resonance frequency and a parallel resonance frequency, and an inductor coupled in series or parallel with the film bulk acoustic wave resonator. The series connection of the inductor and FBAR decreases the series resonance frequency. The parallel connection of the inductor and the FBAR increases the parallel resonance frequency. The tuning circuit further comprises a varactor coupled in series or parallel with the inductor and the FBAR combination. The varactor tunes the oscillation frequency over the increased tuning range.
REFERENCES:
patent: 2596460 (1952-05-01), Arenberg
patent: 3735286 (1973-05-01), Vane
patent: 4550293 (1985-10-01), Driscoll
patent: 5185589 (1993-02-01), Krishnaswamy et al.
patent: 5291159 (1994-03-01), Vale
patent: 5789845 (1998-08-01), Wadaka et al.
patent: 5905418 (1999-05-01), Ehara et al.
patent: 6051907 (2000-04-01), Ylilammi
patent: 6081171 (2000-06-01), Ella
patent: 6262637 (2001-07-01), Bradley et al.
patent: 6323736 (2001-11-01), Jansson
patent: 6407649 (2002-06-01), Tikka et al.
patent: 6469586 (2002-10-01), Rogers et al.
patent: 6472954 (2002-10-01), Ruby et al.
patent: 6504443 (2003-01-01), Eguizabal
patent: 6710681 (2004-03-01), Figueredo et al.
patent: 6774746 (2004-08-01), Whatmore et al.
patent: 6838956 (2005-01-01), Bradley
patent: 6885260 (2005-04-01), Nishimura et al.
patent: 6924583 (2005-08-01), Lin et al.
patent: 6936837 (2005-08-01), Yamada et al.
National Semiconductor Corporation
Wamsley Patrick
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