Integrated PM/FM modulator using direct digital frequency synthesis and method therefor
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United States of America Patent
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May 29, 2007
Grant Date -
Mar 1, 2007
app pub date -
Aug 23, 2005
filing date -
Aug 23, 2005
priority date (Note) -
Expired
status (Latency Note)
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Abstract
A PM/FM modulator (100) includes an analog-to-digital converter (110) having an input terminal for receiving an analog input signal, and an output terminal, and a direct digital frequency synthesizer (120) having an input terminal coupled to the output terminal of the analog-to-digital converter, and an output terminal for providing a modulated output signal. In one form, an FM stereo modulator (200) includes a digital stereo modulator (210) and a direct digital frequency synthesizer (250). The digital stereo modulator (210) has a first input terminal for receiving a right analog input signal, a second input terminal for receiving a left analog input signal, and an output terminal for providing a digital signal having a stereo spectrum. The direct digital frequency synthesizer (250) has an input terminal coupled to the output terminal of the digital stereo modulator (210), and an output terminal for providing a modulated output signal.
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