专利名称：Signal generator发明人：Hiroaki Haruyama申请号：US09570294申请日：20000512公开号：US06625422B1公开日：20030923
专利附图：
摘要：A signal generator for generating a high frequency without using a VCO and aloop filter is disclosed. A digital signal tapped off from a digital synthesizer generating adigital signal corresponding to a desired frequency is converted into an analog signal bya D/A converter. This signal is deprived of its unwanted wave signal components by a
bandpass filter, and the analog signal thus obtained is used as an RF signal. A frequency-multiplied signal of an output signal of a reference signal generator generating thereference signal is supplied to a mixer as a local oscillation signal. The mixer mixes the RFsignal supplied thereto with the local oscillation signal to frequency-convert the signalsinto a high-frequency signal. The high-frequency signal is deprived of its out-of-bandnoises by a filter to provide a local oscillation signal for use in a communicationapparatus.
申请人：MATSUSHITA ELECTRIC INDUSTRIAL CO., LTD.
代理机构：RatnerPrestia
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