发明名称 |
Composite direct digital synthesizer |
摘要 |
A low-power digital frequency synthesizer combining direct digital frequency synthesis techniques with serrodyne frequency translation principles to produce a wideband frequency response with high spectral purity. A conventional direct digital synthesizer is used to generate a high-resolution analog carrier signal from a low-speed digital clock signal. The carrier signal is phase modulated by a low-resolution signal generated from a high-speed digital clock signal. The modularity signal is a higher frequency signal than the carrier signal. The phase modulation is accomplished by exact decoded attenuators. The spectral purity of the resulting high-resolution output signal is unobtainable by conventional direct digital synthesizers, while providing significant power savings.
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申请公布号 |
US5303412(A) |
申请公布日期 |
1994.04.12 |
申请号 |
US19920851481 |
申请日期 |
1992.03.13 |
申请人 |
MASSACHUSETTS INSTITUTE OF TECHNOLOGY |
发明人 |
KUSHNER, LAWRENCE J. |
分类号 |
G06J1/00;H03C1/52;H03C3/40;H04L27/12;H04L27/20;(IPC1-7):H03D7/16 |
主分类号 |
G06J1/00 |
代理机构 |
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代理人 |
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主权项 |
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地址 |
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