发明名称 |
SEGMENTED SPECTRUM CLOCK GENERATOR APPARATUS AND METHOD FOR USING SAME |
摘要 |
A segmented spectrum clock generator (100) provides a signal (300) with a frequency response having multiple segments with a sharp rolloff of at least 10 dB on both sides of each individual segment's peak amplitude across the entire spectrum. A frequency synthesizer (preferably a phase locked loop) generates the output signal (154) by modulating the output frequency at a predetermined rate between a "lower bound" and an "upper bound" modulation frequency. To create and control a segmented spectrum profile, a different value is introduced to the feedback counter (138) to force the VCO (134) to emit a new frequency or phase. Programmable pre-divider (114, 136) and post-divider (142) circuits are used on both sides of the feedback counter (138). A microprocessor or logic state machine load values into registers (114, 140, 144) that program the dividers.
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申请公布号 |
WO0225806(A1) |
申请公布日期 |
2002.03.28 |
申请号 |
WO2001US29317 |
申请日期 |
2001.09.20 |
申请人 |
LEXMARK INTERNATIONAL, INC. |
发明人 |
HARDIN, KEITH, BRYAN;OGLESBEE, ROBERT, AARON |
分类号 |
G06F1/04;H03B23/00;H03L7/183;H03L7/197;H04L7/033;(IPC1-7):H03D3/24;H03L7/06 |
主分类号 |
G06F1/04 |
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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