Transferring RF Circuits - ADS/Cadence Allegro Integration Keysight EEsof EDA English Chinese (Simplified)

Transferring RF Circuits - ADS/Cadence Allegro IntegrationYouTube↗ IA↗(long shot)
Science & Technology 4.8K views 8 likes 2 dislikes 01 Aug 2014

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Hello, and welcome to this video demonstration showing how the design integration between the Agilent Advanced Design System and the Cadence Allegro PCB design environment can shorten design cycles and improve design quality for RF mixed signal designs.

大家好，欢迎您观看安捷伦先进设计系统（ADS）与 Cadence Allegro PCB 设计环境的设计集成演示视频。两个系统集成可以缩短射频混合信号设计的设计周期，同时提升设计质量。

In this video, you will hear Dan Evers of Agilent showing the design flow from an RF design perspective, and Gary Hind of Cadence from a PCB design perspective. Seamlessly moving the design between the two environments ensures that the RF design is faithfully incorporated

本段视频中，来自安捷伦的 Dan Evers 将从射频设计角度为您演示设计流程， Cadence 的 Gary Hind 将为您从 PCB 设计角度演示设计流程。在两个不同的环境中无缝移动设计可以确保射频设计忠实地与 PCB 集成，然后应用 ADS 方便地验证所有必要的修改。

into the PCB, and any required modifications can easily be validated in ADS. So, for this demonstration, we�re going to take a rather typical RF problem. This is a microstrip coupled line filter, with a bandpass centered around 11.5 GHz. And you�ll notice we�ve got here a schematic composed of parameterized transmission-line elements,

因此，本次演示我们将使用一个非常典型的射频问题，一个 11.5 GHz 中心频率带通微带耦合线滤波器。如视频所示，我们提供一个使用参数化传输线元件的原理图，

and a corresponding layout constructed from those same parameterized transmission line

以及由相同参数化传输线元件构建的对应版图。我们在测试台中进行了测试，并进行了仿真，结果显示

elements. We�ve got this in a testbench here, and we�ve simulated this, and we can

我们确实获得了需要的通带。

see that we really do have the passband where we want it. The goal, now, is to get this faithfully represented in Cadence, as part of a larger mixed signal

现在的目标是确保设计在 Cadence 中具有同样的性能，以组建更大的混合信号设计。因此，关键问题在于我们一次性导出原理图和版图，

design. And the crucial thing now is we export both the schematic and the layout, with these parameterized information, all in one shot. So we can do this from the Export menu in

同时包含参数化信息。使用 ADS 版图的 Export 菜单可以帮助我们完成实现该目标。

the ADS layout. File. Export. And this will send both the schematic and the layout and complete definitions. Hit the Export button. We�ll now pass this directory to the engineer completing the larger mixed signal design, in which this filter needs to be a part.

菜单 File -> Export 可以导出原理图和版图以及完整的定义。点击 Export 按键，我们将此目录传递给工程师，以完成更大的混合信号设计。混合信号设计中需要包括滤波器。现在我们已获得混合信号设计，并在其中应用 IFF 文件。

We have a mixed signal design that we are going to be using for the destination for the IFF file. As you can see from the design, it�s a predominantly digital design. There is some analog circuitry. And I also have a placeholder for an RF block. So, as we can see, the whole design in its entirety. We go back to the Project Manager.

您可以看到，设计主要为数字属性，包含部分模拟电路，而且预留了射频模块的位置。现在，整个设计已经完整。我们返回项目管理器。

I�ll say, �Import IFF,� and we�ll use RF/PCB and you can see the dialog opens. It asks me for the IFF file. And this is the coupled line filter that you saw earlier. Now we�ll import the schematic IFF file, so we�ll open this, and then we�ll say,

选择“Import IFF”，我们将使用 RF/PCB。对话框打开。对话框要求提供 IFF 文件，就是之前看到的耦合线滤波器。现在导入原理图 IFF 文件，我们打开文件，然后点击“Finish”。现在打开原理图工具，以便读取 IFF 文件。

�Finish.� I�ll now launch the schematic tool and this will be reading the IFF file, so if we go to the sheet that we showed you earlier and you can see this is where I need to place the design. I�m going to say, �Component,� and �Add.� And in the library I�ve got

如果您记得之前演示的版图，这就是我放置设计的位置。选择“Component”、 “Add”，然后打开库，找到滤波器。

the filter. We select the block and descend, and now you can see the schematic circuit of the RF design. Just to show what�s actually been transferred here, as well. If I select one of the ending components and do an �Attribute,� you can see that I�ve now got the RF parameters,

我们选择模块。现在您可以看到射频设计的电路原理图。为了演示设计的实际转移，我选择一个终止元件，并选中 “Attribute（属性）”，您可以看到我获取的射频参数，例如线长和线宽。实际上，对于该元件

which will give me things like the line length and the width. And actually, on this component,

您可以看到线长目前为 100 mils。

you can see the line length is currently 100 mils. And then I�ll just start Allegro PCB. So as you can see, there�s a large portion of digital circuitry. There�s the analog circuitry that we talked about earlier. We�re now ready to go to accept the RF elements. I�ll say, �Quick Place,� and you can

然后，我打开 Allegro PCB。您可以看到很大一部分的数字电路。前面曾提到，设计中包含部分模拟电路。我们现在将引入射频元件。选择“Quick Place（快速放置）”，您可以看到元件的列表，包括已放置元件、角度和部分需要放置的射频元件。

see a list of placed components, angles, and some RF elements that need to be placed. I�ll select, �Start.� Some elements have now been placed along the top of the design. If I window in, here you can see all the parameterized elements. I�m going to say, �Edit, Move.� Select all of these elements, and we�ll now actually move over to the area where we�d

选择“Start”，部分元件将放置于设计的上方。放大窗口，您可以看到所有参数化元件。选择“Edit, Move”。选中所有元件，然后在希望的位置放置元件。

like to place the components. So now we can see what the RF elements are actually connected onto this pin, or this capacitor, in the analog section. Within RF/PCB I can say, �Edit, Snap,� and I can now snap the rest of the circuitry

现在，我们看到射频元件与模拟电路元件的实际连接。例如一个射频元件与某个引脚连接，或某个电容连接。在 RF/PCB 中选择“Edit, Snap”，以连接电路剩余部分，并完成设计。如图所示，这是一个之前我们在 ADS 看到的耦合线滤波器。

to complete the design. And there we go. This is the coupled line filter that we saw earlier

滤波器与混合信号板连接。

in ADS connected into the mixed signal board. I do have one problem though. There are some mechanical pins that have been placed down here, and I�ve been told that these cannot be moved. So, unfortunately, the coupled line

我面临一个问题。此处放置了部分机械引脚，而且这些引脚不可移动。更糟糕的是，耦合线滤波器实际上会影响该区域。因此我需要进行部分改动。

filter actually violates this space, so I need to make some changes. What I�d like to do is to change this line to 500 mils. So now you can see it�s updated the length of that line and the circuit now needs to be updated and re-established connectivity. One click, and I�ve now moved the whole filter and it�s now connected on the changed

我将线长改为 500 mils，您可以看到更新后的线长，电路也需要更新，并重新建立连接。只需一次点击操作，我可以将整个滤波器移动，然后与改动后的线长连接。

line length.

我改动了射频电路，因此我必须向射频工程师说明。

I�ve made a change to the RF circuit so I need to be able to provide this back to the RF engineer. I�ll select OK, take the default directories, and notice I do have the choice now to export the stack up from Allegro as well. I can even map the Allegro layers to ADS layers. We say OK. Export is finished. I now hand that IFF file back over

我选择 OK，使用默认目录。注意，我可以选择从 Allegro 导出。我也可以选择将 Allegro 层映射到 ADS 层。点击 OK，完成导出。现在我可以将 IFF 文件交回给射频工程师。

to the RF designer. And it�s important now that we revalidate that circuit to make sure it still conforms to our initial specifications. So, to bring that layout from Cadence back into ADS we can simply open a blank ADS layout and we use File, Import, and we�ll chose the IFF

重新验证电路以确保电路符合初始技术规格十分重要。要将 Cadence 的版图导入 ADS，我们只需打开一个空白的 ADS 版图。然后选择“File”、 “Import”，并选择 IFF 选项。我们看到引导传输线比此前更长。

option. We can see that the leading transmission line heading into this is considerably longer than it was before. And the question is, does this hurt the response of our filter? We can, from this layout, generate an ADS schematic. We can copy the schematic back into our original testbench. So, our initial design will be ports 1 and 2, and the results, and the proposed

问题是，这是否会影响滤波器的响应？我们可以应用该版图生成一个 ADS 原理图。复制原理图到最初的测试台。我们最初的设计为端口 1 和端口 2，根据建议修改的设计，也就是我们获得的结果，

changes to that design will be ports 3 and 4. We�ll re-run the simulation. We�ll

为端口 3 和端口 4。再次运行仿真。返回数据显示。

go back to our Data Display here. Now, focusing first on the transmitted energy, we can see that we�re still essentially the same passband. Minor changes, but it�s still within our specification. Looking at the insertion loss, we can see some changes here, but again, this fits within our specification,

首先我们关注传输能量，我们发现通带基本保持不变。数值有小幅变化，但仍处于技术规格范围。接下来查看插入损耗，我们可以看到部分变动，但同样在技术规格许可范围内。如果超出技术规格要求，我们可以返回并进行调整，然后将设计返回 Cadence。

and if not, we can go back and make our adjustments and send the design back to Cadence again. Thank you for viewing this video about the integrated solution from Agilent and Cadence.

感谢您观看安捷伦和 Cadence 集成解决方案演示视频。您可以搜索其它视频，进一步了解设计流程。

There are also three other videos covering other aspects of the design flow, including the transfer of custom copper shapes, synchronizing packaged parts libraries, and transferring designs with packaged parts. We encourage you to watch these videos as well to get the complete picture of this integrated solution. And if you haven�t experienced ADS firsthand,

例如定制铜形状转移、同步封装部件库和包含封装部件的设计转移等。我们建议您观看上述及类似视频，以全面了解集成解决方案。如果您没有亲身体验过 ADS 的强大功能，您可以访问以下网址，申请免费的 ADS 试用许可证。

you can visit this URL to get a free ADS trial license.

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