PSoC比较器有多好

你有正弦、正方形或三角形的脉冲吗？



     以下为原文
  Do you a sine, square, or triangle shaped pulse?

输入是我的正弦波……我很抱歉提供有关传入信号的信息……它不是5VPP……而是以大约10V的毫伏在2.5V直流的顺序。



     以下为原文
   The incoming is my sine wave........I am sorry about providing info about the incoming signal.....its not 5Vpp......but in the order of few10s of  milli volts around 2.5v dc.

您可能需要使用比较器启用滞后和去抖动。然而，你也可以通过TH信号过滤器去除噪音。



     以下为原文
    
    You may need to use the comparator with Hysteresis enabled and with debouncing as well. However you can also have th signal thru filters to remove the noise.

我的唯一设计（到目前为止）与比较器相当好，但我有一个4V的P P方波进来。为了获得最好的结果，我运行到一个专用运算放大器输入，并缓冲信号与最快的运算放大器设置。然后，它通过比较器运行，具有良好的VREF（而不是电源分流电阻）。它是岩石固体，但我的波是亚10kHz。事实上，现在我记得我有另一种设计，运行在1 V的P P正弦波，上述方法工作正常。
如果信号是几毫伏，它可能值得放大你的信号吗？运算放大器的偏移是2毫伏，比较器迟滞是在10毫伏的顺序。PGA的内置（虽然观看3dB截止），或使用外部复位器和运算放大器。
我真的很差计算的东西，所以一般我去的建设和测试方法，我想这可能是为什么我喜欢PSoC，因为它真的就像一个电路板，但所有在一个IC。



     以下为原文
   My only design (so far) with the comparator was quite good, but I had a 4V p-p square wave coming in. To get the best results I ran it into one of the dedicated op amp inputs, and buffered the signal with the fastest op amp setting. Then it ran it through the comparator, with the good Vref (not the power supply split resistor). It was rock solid, but my wave was sub 10KHz.. Actually, now I recall I have another design that operates on a 1 v p-p sinve wave and the above approach worked just fine.
    If the signal is a few mV it might be worth it to amplify your signal? The opamp offset is 2 mV, and comparator hysteresis is on the order of 10 mV. PGA's are built in (though watch the 3db cutoff), or use external resitor and an opamp.
    I am really bad at calculating things, so generally I go for the build and test approach, I think that may be why I like PSoC, since its really just like a breadboard, but all inside one IC..

也取决于噪音水平。你可以考虑一个简单的
RC LP滤波器在输入信号路径中取出快速L和C瞬变
可能超过使用的歇斯底里水平。这样做的另一种方法是
使用运算放大器作为比较器，并将其功率电平设置为低电平，因此
它的转换率和BW将作为LP滤波器过渡。
只是一些选择。
问候，Dana。



     以下为原文
  Depends on the nosie level as well. You might consider a simple
    RC LP filter in the input signal path to take out fast L and C transients that
    might exceed hysterisis levels used. Another way of doing this is
    to use an OpAmp as a comparator, and set its power level low, hence
    its slew rate and BW will act as a LP filter to transients.
     
    Just some options.
     
    Regards, Dana.

另外一个评论。OpAmp有一个补偿帽
限制全功率BW（VS小信号BW）的关键是什么。思考另一
方式，它就像一个LP滤波器，以大瞬态，以及它的小SigANL BW
影响。比较器通常没有补偿帽。
问候，Dana。



     以下为原文
  One additional comment. An OpAmp has a compensation cap in it, thats
    what is key in limiting full power BW (vs small signal BW). Thinking another
    way, it acts like a LP filter to large transients, as well as its small siganl BW
    effects. A comparator has typically no compensation cap in it.
     
    Regards, Dana.

我的信号是40K信号。由于滞后是10mV，我想我可以忍受噪音破坏我的信号……
PGA可以作为一个很好的低通滤波器。随着增益的增加，截止值下降……但是每十年的衰减是20dB，所以我的40K的谐波即使在没有高增益的情况下也能很容易地爬行……



     以下为原文
   My signals are 40k signals. Since the hysteresis is of 10mv, i think i can sustain with the noise corrupting my signals......
    PGA can act as a good low pass filter...as gain increases the cutoff comes down....But the falloff is 20db per decade so the harmonics of my 40k can easily creep in even though not having high gain......