Modulators – Frequency modulator – Including discrete semiconductor device
Reexamination Certificate
2007-12-10
2009-10-27
Mis, David (Department: 2817)
Modulators
Frequency modulator
Including discrete semiconductor device
C331S1170FE, C331S17700V, C331S185000, C331S186000
Reexamination Certificate
active
07609123
ABSTRACT:
Transistors M11and M12are cross-coupled to each other so as to form a negative resistance circuit. First and second variable capacitor sections10and20are connected in parallel with an inductor circuit so as to form a parallel resonant circuit. A first reference voltage Vref1and a control voltage VT1corresponding to a carrier wave component are fed to both terminals, respectively, of each of variable capacitors VC11and VC12included in the first variable capacitor section10.A second reference voltage Vref2and a control voltage VT2corresponding to a modulated wave component are fed to both terminals, respectively, of each of variable capacitors VC21and VC22included in the second variable capacitor section20.A DC control section30includes a resistance R31interposed between the second reference voltage Vref2and a common connection point of resistances R21and R22,and a capacitor C31for feeding only an AC component included in the modulated wave component to the common connection point of the resistances R21and R22.Thus, a DC voltage, on which the AC component included in the modulated wave component is superimposed, is changed from a certain DC bias to a DC bias of the second reference voltage Vref2.
REFERENCES:
patent: 4801898 (1989-01-01), Obayashi
patent: 5027429 (1991-06-01), Kojima
patent: 2005/0231296 (2005-10-01), Souetinov et al.
patent: 07-254818 (1995-10-01), None
patent: 2 005-253066 (2005-09-01), None
Takashi Oshima and Masaru Kokubo, “Simple Polar-Loop Transmitter For Dual-Mode Bluetooth”, Hitachi Ltd., Central Research Laboratory, pp. 3966-3969, 2005.
Mis David
Panasonic Corporation
Wenderoth , Lind & Ponack, L.L.P.
LandOfFree
Direct modulation type voltage-controlled oscillator using... does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Direct modulation type voltage-controlled oscillator using..., we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Direct modulation type voltage-controlled oscillator using... will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-4053962