Another way to generate analog signals is to use Waveform and Label equations. This is a little simpler than writing the Python code required when using the Waveform Equation Blocks of the previous section. However, once the waveform is generated you cannot edit it using the original equation. You will have to either edit each edge, or delete a section of the waveform and regenerate it.

In this example, we will use a Waveform Equation (not a block equation) to generate the blank waveform segments. Then use a State Label equation to insert the values onto the segments. We will be inserting an extra segment for each value change so that we can use it in the next section to render a "stepped" waveform even though we have not checked the Use Straight Edges checkbox.

Use a Waveform Equation to Generate the Valid segments:

Use a simple Label Equation to label the segments:

The Label Equation box accepts equations that generate state values for the signal's waveform segments. This example demonstrates the concatenation operator (the comma). The concatenation operator can also be combined with the decrement and increment label equations to create more complex patterns.

Create an Analog Signal:

Although the above analog signal appears to have ramps in it, it will look like a stepped waveform when exported to a digital simulator. To create ramps that export to a digital simulator, use the Ramp label equation as discussed later in this tutorial.