Pulse or digital communications – Transceivers – Modems
Reexamination Certificate
2011-07-05
2011-07-05
Fan, Chieh M (Department: 2611)
Pulse or digital communications
Transceivers
Modems
C375S243000, C375S316000, C375S295000, C327S101000, C327S113000, C327S115000, C327S116000, C327S124000, C327S117000
Reexamination Certificate
active
07974333
ABSTRACT:
A semiconductor apparatus includes a signal source7that outputs a signal of predetermined frequency, a frequency divider15that receives the output signal of the signal source and is capable of switching the output signal to two or more frequency division ratios, a delta-sigma modulator16that controls the frequency division ratio of the frequency divider, and a bandpass filter17that receives an output of the frequency divider. The frequency of the input signal of the frequency divider is divided by the frequency division ratio controlled by the delta-sigma modulator, and quantization noise appearing in the output of the frequency divider generated by the delta-sigma modulator is attenuated with the bandpass filter. The semiconductor apparatus easily can convert a signal output by a single signal source to a signal of predetermined frequency and supply a plurality of signals of predetermined frequency using a simple configuration with reduced chip size.
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Fan Chieh M
Hamre Schumann Mueller & Larson P.C.
Lee Siu M
Panasonic Corporation
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