Invention Grant
US07889812B2 Direct digital frequency synthesizer with phase error correction, method therefor, and receiver using same
失效
具有相位误差校正的直接数字频率合成器,其方法和使用其的接收机
- Patent Title: Direct digital frequency synthesizer with phase error correction, method therefor, and receiver using same
- Patent Title (中): 具有相位误差校正的直接数字频率合成器,其方法和使用其的接收机
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Application No.: US11442195Application Date: 2006-05-26
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Publication No.: US07889812B2Publication Date: 2011-02-15
- Inventor: David S. Trager , Mitchell Reid
- Applicant: David S. Trager , Mitchell Reid
- Applicant Address: US TX Austin
- Assignee: Silicon Laboratories, Inc.
- Current Assignee: Silicon Laboratories, Inc.
- Current Assignee Address: US TX Austin
- Agency: Polansky & Associates, P.L.L.C.
- Agent Paul J. Polansky
- Main IPC: H03K9/00
- IPC: H03K9/00 ; H03D3/00 ; H03M1/66

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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