Telecommunications – Transmitter – Plural modulation
Reexamination Certificate
2007-11-07
2010-10-26
Trinh, Sonny (Department: 2618)
Telecommunications
Transmitter
Plural modulation
C455S042000, C455S126000
Reexamination Certificate
active
07822392
ABSTRACT:
Provided is a frequency modulation circuit for outputting a frequency-modulated signal with a high precision. A VCO13includes a first variable capacitor132having a predetermined capacitance change rate, and a second variable capacitor133having a greater capacitance change rate than that of the first variable capacitor132. When the frequency modulation circuit is applied in a narrowband modulation method, a switch15switches a connection path of an open loop such that an input terminal and the first variable capacitor132are connected. On the other hand, when the frequency modulation circuit is applied in a wideband modulation method, the switch15switches the connection path of the open loop such that the input terminal and the second variable capacitor133are connected.
REFERENCES:
patent: 6549078 (2003-04-01), Sridharan et al.
patent: 6973136 (2005-12-01), Kojima et al.
patent: 7120396 (2006-10-01), Wilson
patent: 7199677 (2007-04-01), Yoshikawa et al.
Panasonic Corporation
Trinh Sonny
Wenderoth , Lind & Ponack, L.L.P.
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