and some say it's the dithering from Intel chips - could it be it? Thanks, Janno
2018-11-13 11:25
已经破解了NCO这个IP核，如图：但是生成的时候一直卡在这里：并且设置参数的时候无论怎样修改参数，生成的波形实际频率都显示为1Hz,如图：
2017-03-23 19:33
`module dithering( input clk, input key_in, output regkey ); wire key_rising; wire key_falling
2020-04-10 15:00
本文在Simulink软件平台仿真LUTs技术实现NCOs时，累加器步长、累加器控制字等参数对NCOs性能的影响。重点讨论NCOs的频谱纯度问题，即如何抑制杂波分量，影响频谱纯度的因素以及如何提高无杂散动态范围（SpuriousFree Dynamic Range，SFDR）。
2021-05-06 06:35
Hai，是否可以选择折叠波形，在INFINIIVISION 2000x系列示波器中，如果没有请告诉我，哪种类型的仪器可以有？ 以上来自于谷歌翻译 以下为原文Hai, Is there is option to fold waveform , in INFINIIVISION 2000x series oscilloscope , if not plz tell me , which type of instrument can have?
2019-02-28 10:53
求大佬分享一款具备超低Iq和低EMI的DC/DC稳压器ARG81800
2021-06-15 08:43
你好，我已将DDS芯片的输出连接到我的Artix-7 FPGA引脚，用作频率为F0的时钟。我也限制了这个时钟（按照F0），并在FPGA中使用输入缓冲器。然后将该时钟连接到MMCM ip内核的输入，该内核生成两个输出时钟（F0,2F0）。我已将MMCM的复位引脚连接到0。我看到当我启动我的系统时，10次中的9次正常启动，但是一旦它以MMCM的LOCK引脚永远不会变高的方式启动，我必须执行电源循环来重启系统，之后再次运作。在MMCM中，我已经配置了时钟频率（F0,2F0），使得它们呈现一般值，但实际值可以有高达10 MHz的变化.....任何人都可以解释为什么有时锁会永远丢失......提前致谢。以上来自于谷歌翻译以下为原文Hello, I have connected the output of a DDS chip to my Artix-7 FPGA pin, to be used as a clock of frequency F0. I have also constrained this clock (as per F0), and use input buffers in the FPGA. This clock is then connected to the input of an MMCM ip core, which generated two output clocks (F0, 2F0). I have connected the reset pin of the MMCM to 0. I see that when i start my system, 9 out of 10 times it starts normally, but once it starts in such a way that the LOCK pin of the MMCM never goes high, and i have to perform a power cycle to restart the system, after which it works again. In the MMCM, I have configured the clock frequencies (F0, 2F0) such that they assume a general value, but the actual values can have variations upto 10 MHz..... Could anybody explain why it happens sometimes that the lock is lost forever... Thanks in advance.
2019-04-23 08:53
嗨，我正试图解决最后几个遗留问题与我的设计，我有几个问题：1。我在呼吸压力模拟输入和比较器使用的一些参考电压之间得到了许多模拟交叉耦合。如果我尝试使用不同的模拟输入，那么设计将无法路由。你有什么建议或建议，如何解决这个问题？2。模拟多路复用器的当前限值是多少？我想用一个放电电阻器代替其他DAC，这样我就可以释放它来增加分辨率。三。我试图使用抖动模块来增加DAC分辨率，但是我正在运行共享总线问题（见之前从未得到回复的帖子），有没有办法做到这一点？谢谢，-迈克 以上来自于百度翻译 以下为原文Hi, I'm trying to fix the last few remaining problems with my design, and I have a few questions: 1.I'm getting a lot of analog cross-coupling between the breath pressure analog input and some of the reference voltages used by the comparators.If I try to use a different analog input , then the design will fail to route.Do you have any advice or suggestions on how to fix this? 2.What is the current limit of the analog multiplexors?I was thinking to use a discharge resistor instead of the other DAC so I can free it up to increase the resolution. 3.I was trying to use the dither module to increase the DAC resolution, but I was running into the shared bus problem (see previous post that never got answered), is there a way to do this? Thanks, -Mike
2019-03-19 07:53
我们可以做什么测试线性（INL）的12位SAR ADC与正弦信号源，只有10位DAC？简单地说，如何提高10位DAC源的线性性能？赞赏你的评论谢谢 以上来自于百度翻译 以下为原文What can we do to test linearity (INL) of 12bit SAR ADC with sinusoidal signal source which has only 10bit DAC ? Simply put how can i increase linearity performance of 10bit DAC source? Appriciate your comments Thanks
2019-07-05 06:00
我们使用IQ16进行计算，但是我们需要8位输出。所以，我们正在改变比特，但是我们正在丢失LSB部分。是否可以将16位数据转换为8位数据而不丢失位。 以上来自于百度翻译 以下为原文 We are using IQ16 for calculations but we want 8 bit output. so,we are shifting the bits but we are loosing LSB part. is it possible to convert 16 bit data to 8 bit data without loosing bits.
2019-03-06 08:15
