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Creating Subcircuits in Multisim

In the previous article we analyze how the multi-page design can help us have a better organization of our circuit. Following the philosophy of "divide and conquer" continue studying the design blocks in Multisim, and this time we will learn to use subcircuits in our designs.

A subcircuit is a circuit in Multisim to reduce to a single block for a better organization of our schematic. Towards a programming analogy, a subcircuit is equivalent to a subroutine. Here is an example.

The following is an excerpt from a counter circuit:

As you can see, we have a clock generardor based on the 555 (enclosed in box) that connects to terminal 14 (CLK) of 74190N, here is more detail the clock signal generator :

To simplify our design in Multisim, we will convert the signal generator subcircuit clock, so be represented as a single block in the schematic. To do this first we select all the components that make up the clock signal generator:

Now select the menu Place>> Replace Subcircuit. Enter a name for the subcircuit:

We click OK and place the subcircuit on the workspace:

Ready, we have reduced generator clock signal to a single block: a subcircuit. In the window Design Tools can see the hierarchy of our design. We have the main circuit ( Counter ) and subcircuit clock. Note that the latter has an icon with an S, this indicates a subcircuit.

If necessary to view and / or modify the subcircuit, simply select the window Design Tools in Multisim to open it:

The subcircuits in Multisim are saved along with the main file so if you move the main file to another location, it automatically moves the subcircuit. The disadvantage is that the file size can be large, clear, depending on the complexity of design. Another aspect to consider is that a subcircuit can not be reused in other designs of Multisim. For this blocks are hierarchical, they talk in a later entry.

As always welcome comments and questions.

Greetings! Fernando

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Creating a Multi-page Design

As the complexity and size of an electronic design grows it becomes more necessary to have a better organized. We must always bear in mind that our diagram should be clear, easy to modify, and easy to read by others. To help with this challenge Multisim Design offers blocks, they are still the philosophy of "divide and conquer." The main idea is to split a large diagram in small plots easy to manage and update. There are three options in the Multisim design blocks, subcircuits, hierarchical blocks, and mult-ipágina design. In this last talk today.

As mentioned earlier, the idea of \u200b\u200bmulti-page design is to divide a large design and confused individual pages interconnected. As illustrated in the following figures, instead of having one large sheet, we can have our design on individual sheets:

To connect our circuit from one page to another using the off-page connectors , which are Multisim menu Place >> Connectors :

Here's how to make a multi-page design with a simple design. We will refer to the following circuit:

Let's split the previous circuit into two sections, A and B. The division was made at nodes 3 and 0:

Now let's add one more page to our design, and the page will post the section B. For this select Place >> Multi- page. Multisim will ask the name of this page, this case the name 2. Multisim will create a new page with the same status as the first. This can be corroborated in the window Design Tools:

leaf can change in just to click on them.

As next step go to page 1, select it and cut the circuit section B and paste it on page 2, so that now we have the Section A of the circuit on page Filter # 1 and Section B in Filter # 2 . To connect the two pages (and of course both nodes) we will use off-page connectors. Place selected >> Connectors>> Connector Outside P OAR. Place two of these connectors in the workplace:

Open the properties of the first connector (FueraPágina 1) and rename it to 3 (the node of interest.) Do the same with the connector FueraPágina 2, but in this case rename it to 0. Then connect the connectors to the respective owner nodes:

A hour we sheet Filter # 2 and repeat the same operation. Multisim will alert us that connectors with the same nodes ( 0 and 3) already exist, we will accept this change to connect 'virtual' between the two p OAR Circuit:

Ready! We now have a multi-page design. Off-page connectors virtual connections (or wireless) between the different sheets. We simulate the circuit and transfer to Ultiboard Multisim seamlessly as is our design as one.

Some notes before the end:

1. multi-page design is recommended when we have circuits that tend to be flat / horizontal.
2. All sheets of the circuit multi-page design are stored in one file.
3. saved file size tends to be large because it contains several pages.
4. can not reuse pages from a multi-page design in other circuits.

As always questions and comments are welcome.

soon,

Fernando