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嗨队,
什么是最大频率可以截止的LPF -我的设计涉及拐角频率大约500千赫。&; C1、C2、C3、C4的值如何影响相同?哪一个应该是一个充满噪音(高度不可预测)的脉冲,它会急剧上升但逐渐消失。(巴特沃思/切比雪夫/ 2或4极) 谢谢。 以上来自于百度翻译 以下为原文 Hi Team, What is the max. frequency that can be cutoff by a LPF - My design involves a corner freq. around 500 KHz. && How does values of C1, C2, C3, C4 affect the same ? Which one should be preferred for a noise ridden (highly unpredictabe) pulse which rises sharply but fades off way too gradually ! (Butterworth/Chebyshev/2 or 4 pole) Thanks. |
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11个回答
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Ramanathan
“不要梦想它,是它”(岩石恐怖)或者更确切地说:只需在你的设计上放置一个LPF,然后右键点击它,然后在即将到来的窗口中选择向导来自动为你设置所有的CS。 快乐过滤 鲍勃 以上来自于百度翻译 以下为原文 Ramanathan, "Don't dream it, be it" (Rocky Horror) or rather do it: Just place an LPF on your design, then right-click on it and select the wizard in the upcoming window to have automatically set all the Cs for you. Happy filtering Bob |
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据我所知,最好的(唯一)消除噪声的方法是对样品进行平均。您的质疑过滤器的特性在这里是HTTP//E.WiKiTo.Org/Wiki/Engic过滤器。
鲍勃 以上来自于百度翻译 以下为原文 As far as I know, the best (only) way to get rid of noise is to average the samples. The characteristics for your questioned filters are here http://en.wikipedia.org/wiki/Electronic_filter Bob |
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播放过滤器显示:
过采样应为约10,以给出可接受的结果。 在500千赫截止频率。将导致5MHz采样频率。 将产生一个20MHz的时钟频率(4倍采样频率),超过了8MHz的绝对允许最大值(我只能使用6MHz)。 看起来在PSoC1上很难执行。 鲍勃 以上来自于百度翻译 以下为原文 Playing around with the Filter shows: Oversampling should be about 10 to give acceptable results. at 500kHz cut-off frequ. would result in 5MHz sampling frequency. Would result in a clock frequency of 20MHz (4 times sample frequ.) which is more than the listed absolute allowable maximum of 8MHz.(I could only manage to use 6MHz) Seemingly that will be difficult to perform on a PSoC1 Bob |
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平均是信号噪声抑制的一种方法,并且具有
快速递减返回。 一些基本的过滤材料-CyPress PSOC SC块滤波的局限性是,对于大信号,转换速率受限。 图17。最大信号与频率的关系,模拟列输出缓冲器的转换速率为0.65伏/秒。对于高功率的操作,这会导致比滤波器本身更低的最大信号限制。 此外,您的问题与极点/零点精度需要过采样。所以需要500千赫 为了超过SAMPELD 10或更大的有意义的响应精度,PSoC 1只是没有能力。 注意另一种方法是基于固定增益,如PGA,但对于大信号BW 500 kHz的滤波器。 可能是一个推动,你必须看看GBW的PHGA的增益需要做一个2极低通滤波器。 注意引诱可能是使用星载MAC,它的速度做IIR 2极滤波器不足。 问候,Dana。 以上来自于百度翻译 以下为原文 Averaging is but one method of signal noise suppression, and has rapidly diminishing returns.en.wikipedia.org/wiki/Signal_averaging Some basic filter stuff - www.cypress.com/ Limitation of filtering with PSOC SC blocks is, for large signal, slew rate limited. Figure 17. Maximum Signal vs Frequency The slew rate of the analog column output buffer is 0.65 V/µsec. For operation at high power, this results in a lower maximum signal limit than the filter itself. Further you have issue with pole/zero accuracy need to oversample. So 500 Khz would need to be oversampeld by 10 or greater for meaningful response accuracy, PSOC 1 just not capable. Note an alternative is to do a filter based on fixed gain, like PGA, but 500 Khz for large signal BW may be a push, you have to look at GBW of PHGA for the gain needed to do a 2 pole LPF. Note tempting might be to use onboard MAC, buts its speed to do a IIR 2 pole filter inadequate. Regards, Dana. |
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用PGA在固定增益滤波器中的应用作简单介绍
在GBW过低。 问候,Dana。 以上来自于百度翻译 以下为原文 Scratch my comments on using PGA in fixed gain filter, it is simply too low in GBW. Regards, Dana. |
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如果你看这个移动平均滤波器和lt;20分贝的抑制。
n=16。 HTTP://PtoMe.EcS.Belkel.Edu/Ecs20/Wea12/FrqRealServ.HTML 问候,Dana。 以上来自于百度翻译 以下为原文 If you look at this the moving average filter < 20 db in suppression. n = 16. http://ptolemy.eecs.berkeley.edu/eecs20/week12/freqResponseRA.html Regards, Dana. |
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安定时间
www. FrqDeV.com/GuID/Apple 问候,Dana。 以上来自于百度翻译 以下为原文 For settling times - www.freqdev.com/guide/analog.html Regards, Dana. |
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鲍伯和Dana
我正在研究它。我的闪烁探测器的脉冲(模拟:700秒的持续时间,具有急剧上升和逐渐下降)的动态范围为0—400毫伏(来自VSS)和。但是当它被馈送到一个LPF(它的引用为AGND(2.5V))时,我没有观察到这样的“LPF O/P”。 我尝试放大,但PGA(GAAI-8)不能像预期的那样放大。我不知道为什么![输入脉冲转换速率不是问题- 60mV/μs]。 无论如何,把LPF的参考给VSS?(如果可以做到这一点,LPF可以直接应用/不放大) 皇家音乐学院 以上来自于百度翻译 以下为原文 Bob & Dana, I'm working on it. My scintillation detector's pulses (analog : 700µs in duration having a sharp rise & a gradual descent) have a dynamic range of 0 - 400mV (from Vss) & are ridden with high-freq noise . But when it is fed to a LPF (which has its reference as AGND(2.5V)), I observe nothing as such @ the LPF's o/p. I tried amplifying but PGA (gain-8) couldnt amplify as expected. I didnt know why! [input pulse slew rate was not a problem- 60mV/µs]. Anyway to bring the LPF's reference to Vss ? (if this can be done, LPF can be applied directly with/without amplification) RAM |
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你能提供一个完整的V、T比例因子的屏幕截图吗?
地面基准? 也许是一个项目档案。 问候,Dana。 以上来自于百度翻译 以下为原文 Can you provide a screen capture of pulse complete with V, T scale factors, and ground reference ? Maybe a project archive as well. Regards, Dana. |
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我会肯定的。但请想一个办法,不管怎样,把LPF提到VSS。
谢谢你 以上来自于百度翻译 以下为原文 I'll send for sure. But pls think of a way to do this - Anyway to bring the LPF's reference to Vss ? Thank you - RAM |
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查看TRM过滤器绑定到AGND,依次由REF MUX在全局资源中设置。
我看不到VSS的任何选择。 从数据表 该滤波器具有可编程增益。滤波器在AGND上偏置,在全局资源中选择,并且增益被引用到该级别。 极性选择输出相对于输入的极性。选择反转设置输出以反转相对于AGND的信号。当增益设置大于1时,增益与AGND相关。当增益设置为1并且极性设置为非反相时,信号不被引用到AGND。该参数仅适用于使用A输入的拓扑结构。 问候,Dana。 以上来自于百度翻译 以下为原文 Looking at TRM filter is tied to AGND, in turn set by ref mux in global resources. I do not see any choice for Vss. From datasheet - The filter has programmable gain. The filter is biased at AGND, selected in the Global Resources, and the gain is referred to this level. Polarity This selects the polarity of the output with respect to the input. Select Inverting to set the output to invert the signal relative to AGND. When Gain is set greater than 1.0, the gain is relative to AGND. When Gain is set to 1.0 and Polarity is set to Non-Inverting, the signal is not referenced to AGND. The parameter applies only to topologies using the A-input. Regards, Dana. |
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