Telecommunications – Receiver or analog modulated signal frequency converter – Local control of receiver operation
Reexamination Certificate
2004-06-24
2008-11-25
Trinh, Sonny (Department: 2618)
Telecommunications
Receiver or analog modulated signal frequency converter
Local control of receiver operation
C455S255000, C455S147000
Reexamination Certificate
active
07457600
ABSTRACT:
VCO (voltage-controlled oscillator) device used for a radio unit such as a television broadcast receiver. A VCO device oscillating in a wide band of oscillation frequency and capable of realizing low power consumption is provided. VCO circuit group4oscillates signals of frequencies corresponding to control voltage Vt applied to frequency control voltage terminal8. LO signal selecting means3selects a required output signal from VCO circuit group4. PLL6frequency-divides local signal fvco selected by LO signal selecting means3, compares a phase thereof with a phase of a reference signal and outputs a signal converted from a phase difference. Loop filter7smoothes the output signal from PLL6, outputs control voltage Vt that is a frequency control voltage and outputs the local-signal selected by signal selecting means3to high frequency signal processing means1.
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Adachi Kenji
Fujii Takeshi
Iwaida Mineyuki
Ozeki Hiroaki
McDermott Will & Emery LLP
Panasonic Corporation
Trinh Sonny
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