Modulators – Frequency modulator – Plural modulation
Reexamination Certificate
2011-05-03
2011-05-03
Chang, Joseph (Department: 2817)
Modulators
Frequency modulator
Plural modulation
C381S003000, C381S014000, C455S066100
Reexamination Certificate
active
07936228
ABSTRACT:
An input signal is input via a first resistor to an inverting input terminal of an operational amplifier. A second resistor is provided on a feedback path between an output terminal and the inverting input terminal of the operational amplifier. A control voltage Vcnt output from the operational amplifier is input to a VCO. A frequency divider frequency-divides an output signal Sout of the VCO. A phase comparator compares an output signal from the frequency divider with a reference clock signal and outputs a voltage according to a phase difference. A loop filter removes a high-frequency component of an output voltage Vcp of the phase comparator and outputs the voltage to a non-inverting input terminal of the operational amplifier.
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Komori Hirofumi
Sagara Takeshi
Cantor & Colburn LLP
Chang Joseph
Rohm & Co., Ltd.
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