[问答]

是否有任何可用的模块可用作具有数字输出的峰值检测器

问答对人有帮助，内容完整，我也想知道答案 0 你好我不确定是否是提出这个问题的正确位置。我希望在ADC的模拟输入之前在模拟信号路径中实现自动增益控制器，这将有助于保护ADC免受更高电压的影响并使用ADC的全动态范围。基本上自动增益控制涉及峰值检测器，可变衰减器和可变增益放大器。如果峰值检测器检测到的电压高于阈值设置，则将包括衰减器。如果峰值检测器检测到的电压低于阈值设置，则将包括放大器。我想知道这是用FPGA实现的吗？如果是，是否有任何可用的模块可用作具有数字输出的峰值检测器。谢谢是adavnce 费萨尔以上来自于谷歌翻译以下为原文 Hi I am not sure whether it is the right place to ask this question. I wish to implement auto gain controller in the analog signal path before the ADC's analogue input , which will help to protect ADC from higher voltages and to use the full dynamic range of ADC. Bascially auto gain control involves a peak detector , variable attenuators and variable gain amplifiers. If the voltage detected by the peak detector is higher than the threshold setting , attenuator will be included. If the voltage detected by the peak detector islower than the threshold setting , amplifier will be included . I am wondering would this be impleneted using FPGA ? If yes , is there any module availabe which can be used as peak detector having digital output. Thanks is adavnce Faisal 0
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答案对人有帮助，有参考价值 0 当然，在数字逻辑（在FPGA中）实现这种类型的电路而不是在电路板上使用模拟峰值检测电路会更简单和更便宜。如果您的需求是合理的（带宽，准确度，精度），那么实现就像您描述的那样简单。如果您需要最后一点精度和带宽，那么您就打开了通往非常复杂和苛刻的反馈系统世界的大门。简单案例：检查ADC的下溢和上溢值，并偶尔将增益控制调整一定量。异国情调：持续过滤输入数据，与源信号的“弹道学”相关联，并应用不同程度的（滤波）增益控制调整。确保增益控制调整带宽不超过增益控制设备的带宽，否则将产生振荡（与任何其他反馈系统一样）。书籍是关于反馈系统理论和实践的。已经有关于峰值检测，信号滤波，重建，插值等的艺术和实践的章节。 - 鲍勃埃尔金德签名：新手的自述文件在这里：http：//forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369总结：1。阅读手册或用户指南。你读过手册了吗？你能找到手册吗？2。搜索论坛（并搜索网页）以寻找类似的主题。不要在多个论坛上发布相同的问题。不要在别人的主题上发布新主题或问题，开始新的主题！5。学生：复制代码与学习设计不同.6“它不起作用”不是一个可以回答的问题。提供有用的详细信息（请与网页，数据表链接）.7。您的代码中的评论不需要支付额外费用。我没有支付论坛帖子的费用。如果我写一篇好文章，那么我一无所获。以上来自于谷歌翻译以下为原文 Certainly it would be simpler and cheaper to implement this type of circuit in digital logic (in the FPGA) rather than using analogue peak detection circuitry on the circuit board. If your needs are reasonable (bandwidth, accuracy, precision), the implementation is as simple as you've described it. If you require every last bit of accuracy and bandwidth, then you have opened the door to the very complex and demanding world of feedback systems. Simple case: Check for underflow and overflow values from ADC, and occasionally adjust gain control by a fixed amount. Exotic case: Constantly filter incoming data, correlate with 'ballistics' of the source signal, and apply varying degrees of (filtered) gain control adjustments. Make sure the gain control adjustment bandwidth does not exceed the bandwidth of the gain control device, or oscillation will result (as in any other feedback system). Books have been written on feedback system theory and practice. Chapters have been written on the art and practice of peak detection, signal filtering, reconstruction, interpolation, etc. -- Bob Elkind SIGNATURE: README for newbies is here: http://forums.xilinx.com/t5/New-Users-Forum/README-first-Help-for-new-users/td-p/219369 Summary: 1. Read the manual or user guide. Have you read the manual? Can you find the manual? 2. Search the forums (and search the web) for similar topics. 3. Do not post the same question on multiple forums. 4. Do not post a new topic or question on someone else's thread, start a new thread! 5. Students: Copying code is not the same as learning to design. 6 "It does not work" is not a question which can be answered. Provide useful details (with webpage, datasheet links, please). 7. You are not charged extra fees for comments in your code. 8. I am not paid for forum posts. If I write a good post, then I have been good for nothing.

2019-6-6 11:34:00 评论举报张晓宁