Introduction to ADS Layout and Getting Started (22)

In this section, Introduction to ADS Layout and Getting Started ; let’s learn about Layout (layout, all components of the circuit are placed in specific locations on the chip, and these components are connected with wiring to realize the circuit function. It is a key step from the logical design (schematic diagram ) of the circuit to the physical implementation).

This section is just a simple introductory tutorial, and we will carry out specific design later.

Let’s create a new workspace and name it “MyFirstLayout_wrk”:

Click “Create Workspace” and select . Then click in the toolbar or select “File – New – Layout” to create a Layout. We can see that “Place ground symbol instances when grounding a net (Deprecated)” is selected by default. At this time, ground symbol instances will be automatically placed when connecting the ground wire. . If we check “Calculate all flight wires between grounds”, the flying wires between all grounds will be calculated. Then click “Create Layout”.

We can see some default page layouts, including toolbars, component libraries, search boxes, etc. We can select “Options – Preferences” to design the page according to our preferences.

If we want to use our personal settings in subsequent designs, we can save them and read them later (.prf file).

We can right-click in the blank area of ​​​​the toolbar and add “Navigator” and “Layers” to the left side of the window. In the Navigator window, we can see all the Net information, and in the Layer window we can adjust the visibility of each layer for better observation, and we can also see the specific definition of each layer in the process library.

On the right side of the page, there is a Property window, in which you can view the properties of the drawn content and all information related to it.

For example, if we want to put some components in the Layout, we can first select “TLines – Microstrip” in the LibraryPalettes, and then select (microstrip line model, a commonly used planar transmission line used to transmit high-frequency signals on printed circuit boards (PCBs) or integrated circuits (ICs)), and we can modify its properties. For example, we can set W to 0.2 mm and L to 6 mm.

Then we can place 5 components side by side. Double-clicking a component can adjust its properties:

At this point, from a typical RF perspective, the layout looks just like the low-pass filter built previously, with the thin lines representing the inductors in series and the thick lines representing the capacitors in parallel.