Direct digital frequency synthesizer with phase error correction, method therefor, and receiver using same
Number of patents in Portfolio can not be more than 2000
United States of America Patent
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Feb 15, 2011
Grant Date -
May 29, 2008
app pub date -
May 26, 2006
filing date -
May 26, 2006
priority date (Note) -
Expired
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Abstract
A receiver (1000) includes a direct digital frequency synthesizer (DDFS) (700) and first (1040) and second (1042) mixers. The DDFS (700) has a first output for providing a first local oscillator signal, and a second output for providing a second local oscillator signal offset from a quadrature relationship with the first local oscillator signal by a phase offset. The first mixer (1040) has a first input for receiving a radio frequency (RF) signal, a second input for receiving the first local oscillator signal, and an output for providing an in-phase signal at another frequency. The second mixer (1042) has a first input for receiving the RF signal, a second input for receiving the second local oscillator signal, and an output for providing a quadrature signal at the other frequency. The DDFS (700) may be implemented using first (702) and second (704) memories storing portions of a sinusoidal waveform and extra memories (706, 708) supporting the phase offset.
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