怎么设置蓝牙模块的AT模式？
2021-10-15 07:03
目前在自学cadence软件，在制作热风焊盘的时候，跟着书本上的步骤，设置参数，为什么点OK生成时，不显示图形？报错显示no element found
2017-07-27 10:35
所有，我有一个由聚酰亚胺制成的柔性电路（er = 3.3到3.5），我想用ADS2011布局确认单端微带线和差分偶数/奇数模式走线的阻抗。我已将Gerber文件加载到工具中，我可以设置多个端口。我的目标是在存在交叉阴影平面（非实心）的情况下提取单端/差分阻抗。柔性电路在动态环境中使用，并且它不能是实心平面参考，因为它会使其疲劳，并最终随着时间的推移而失效（裂纹迹线等）。我想调整走线和交叉影线参数以达到90欧姆差分阻抗和50欧姆单端。我将在两种情况下分解问题 - 差分和单端。我想为差分设置一个案例，并为偶数和奇数模式提取迹线的阻抗。我相信这在ADS中是小菜一碟，我只是不知道如何设置它。我知道我可以转换阻抗Z11 = 50 *（1 + S（1,1））/（1-S（1,1））。从这里我如何得到奇数和偶数模式？如何对交叉影线进行参数化，以便我可以改变一些参数并查看阻抗变化？我真的很感激任何帮助。我挖了我的旧书，我重新找到偶数= Z11 / 2 odd = 2 * Z11的阻抗。但是，我只需要知道我需要在跟踪上放置多少个端口。对于差分情况，我想这是一个双端口测量，但是地面参考怎么样？我会把以下端口P1，P2分别对一端进行差分对。 P3，P4到另一端，地面怎么样？它只是P5吗？然后我将其导出到原理图，并添加地面，因为我无法在布局中添加地面？任何帮助将不胜感激。这是我通过实验和FCC测试得到的经典案例，但我没有模拟模型来预测这一点而不需要迭代flex。谢谢rjrodrig 以上来自于谷歌翻译 以下为原文All, I have a Flex circuit made out of Polyimide (er =3.3 to 3.5), I want to confirm the impedance of single ended microstrip and differential even/odd mode traces using ADS2011 Layout.I have loaded the Gerber files into the tool, and I can setup multiple ports.My goal is to extract the single ended/diff impedance in the presence of a cross-hatched plane (not solid).The flex circuit is used in a dynamic environment, and it cannot be a solid plane reference as it will fatigue it, and eventually fail over time (cracked traces etc).I want to adjust the traces, and cross-hatch parameters to hit 90 ohms differential impedance, and 50 ohms single ended. I will split the problem in two cases -- the differential and single ended.I want to setup a case for the differential, and extract the impedance of the traces for even and odd mode.I am sure this is a piece of cake in ADS, I just don't know how to set it up.I know I can convert the impedance Z11 = 50*(1+S(1,1))/(1-S(1,1)).From here how do I get odd and even mode?How do I parametrize the cross hatch so I can vary the some parameters and look at the impedance changes? I would really appreciate it any help.I have dug up my old books and I recapped the impedance for even=Z11/2 odd=2*Z11.However, I just need to know how many ports I need to put on my traces. For the differential case, I imagine this is a two port measurement, but what about the ground reference?I would put the following ports P1,P2 to diff pair one end. P3,P4 to the other end, what about ground? Is it just P5?Do I then export this to schematic, and add ground since I can't add ground in Layout? Any help would be greatly appreciated.This is a classical case I have gotten around experimentally and through FCC testing, but I don't have a simulation model to predict this without iterating the flex. Thanks rjrodrig
2019-01-08 15:24
0 引言在雷达射频接收系统中，对系统性能指标的要求越来越高，其中低噪声放大器是影响着整个接收系统的噪声指标的重要因素。与普通的放大器相比，低噪声放大器作用比较突出，一方面可以减少系统的杂波干扰，提高系统的灵敏度；另一方面可以放大系统的射频信号，保证系统正常工作。因此，低噪声放大器的性能制约着整个接收系统的性能，对整个接收系统性能的提高起了决定性的作用。因此，研制宽频带、高性能、更低噪声的放大器，已经成为微波技术中发展的核心之一。本文介绍的新型宽带低噪声放大器就是在当前工程技术发展需求的前提下，从放大器本身的特性出发，采用薄膜混合集成电路和先进的共晶微组装工艺，应用平衡式放大电路，精心研制而成的。
2019-07-09 06:08
