发明名称 |
High performance delta sigma ADC using a feedback NRZ sin DAC |
摘要 |
A continuous time delta-sigma analog to digital converter is disclosed. A summing junction receives an input analog signal to be digitized and a feedback signal. A loop filter receives the combined signals from the summing junction, and a course analog to digital converter converts the combined signal to a multi-bit digital number. A sin DAC provides a feedback signal to the summing junction, by reconverting the multi-bit digital signal to an analog signal. The sin DAC produces a linear output signal having a reduced phase jitter, resulting in a lower noise floor for the multi-digital signal. The sin DAC may be an NRZ sin DAC which avoids stringent linearity requirements on the summing junction.
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申请公布号 |
US6462687(B1) |
申请公布日期 |
2002.10.08 |
申请号 |
US20010824566 |
申请日期 |
2001.04.03 |
申请人 |
INTERNATIONAL BUSINESS MACHINES CORPORATIOM |
发明人 |
ESHRAGHI ARIA;GANTI RAMKISHORE;GAO WEINAN |
分类号 |
H03M3/04;(IPC1-7):H03M3/00;H03M7/12 |
主分类号 |
H03M3/04 |
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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