发明公开
EP0658008A2 Sigma-delta analog-to-digital converter (ADC) with feedback compensation and method therefor
失效
Sigma-Delta Analog-Digitalwandler（ADC）mitRückkopplungskompensationundzugehörigesVerfahren。
- 专利标题： Sigma-delta analog-to-digital converter (ADC) with feedback compensation and method therefor
- 专利标题（中）： Sigma-Delta Analog-Digitalwandler（ADC）mitRückkopplungskompensationundzugehörigesVerfahren。
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申请号： EP94118912.8申请日： 1994-12-01
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公开(公告)号： EP0658008A2公开(公告)日： 1995-06-14
- 发明人: Seaberg, Eric C.
- 申请人： MOTOROLA, INC.
- 申请人地址： 1303 East Algonquin Road Schaumburg, IL 60196 US
- 专利权人： MOTOROLA, INC.
- 当前专利权人： MOTOROLA, INC.
- 当前专利权人地址： 1303 East Algonquin Road Schaumburg, IL 60196 US
- 代理机构： Hudson, Peter David
- 优先权： US165683 19931213
- 主分类号： H03M3/02
- IPC分类号： H03M3/02
摘要：
A sigma-delta analog-to-digital converter (ADC) (80) includes first (81) and second (82) integrators, a quantizer (83) connected to an output of the second integrator (82), and a feedback circuit (84) connected to the output of the quantizer (83). In order to avoid the effects of delays through actual circuit elements, the feedback circuit (84) keeps the feedback signal to the first integrator (81) in a high-impedance state until the quantizer (83) resolves the output of the second integrator (82). Thus, the first integrator (81) avoids temporarily summing a possibly incorrect feedback signal. In addition, the feedback circuit (84) also keeps the first integrator (81) from integrating a sum of an input signal and the feedback signal until the feedback signal is driven to its correct state in response to the output of the quantizer (83). To accomplish these results, the feedback circuit (84) includes a compensation circuit (151) for continually determining when the quantizer (83) resolves.
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