Oscillators – Ring oscillators
Reexamination Certificate
2011-07-05
2011-07-05
Kinkead, Arnold (Department: 2817)
Oscillators
Ring oscillators
C331S045000, C331S17700V, C331S03600C, C455S260000
Reexamination Certificate
active
07973609
ABSTRACT:
A frequency synthesizer includes a digitally-controlled oscillator and an oscillation frequency control unit. The digitally-controlled oscillator includes a loop-shaped transmission line path having an odd number of parallel portions in each of which two conductors are arranged in parallel to each other with a space therebetween, and an odd number of intersection portions in each of which two conductors intersect spatially, an active circuit coupled between the two conductors, and a first variable capacitance unit and a second variable capacitance unit. The oscillation frequency control unit includes a ΣΔ modulation circuit for subjecting to ΣΔ modulation a first control signal for switching a high capacitance state and a low capacitance state of a first variable capacitance element included in the first variable capacitance unit.
REFERENCES:
patent: 5640112 (1997-06-01), Goto et al.
patent: 6556089 (2003-04-01), Wood
patent: 6734741 (2004-05-01), Staszewski et al.
patent: 2002/0033737 (2002-03-01), Staszewski et al.
patent: 2003/0006851 (2003-01-01), Wood
patent: 2002-033660 (2002-01-01), None
Adachi Hisashi
Ohara Atsushi
Uemura Shinichiro
Kinkead Arnold
McDermott Will & Emery LLP
Panasonic Corporation
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