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Posts Tagged ‘planar CMOS’

Rapid Custom Digital Cell Layout with the Symbolic Editor

Thursday, November 3rd, 2016

In the ‘Custom Compiler Layout Assistants (Part 1)’ blog post, I profiled the use of the symbolic editor and how it makes placing devices that need to be in a specific interdigitated pattern (for example, a differential pair) very easy. With no constraints to enter and no code to write, layout is done in minutes vs. hours.

However, there is a lot more to the symbolic editor than the ability to simplify interdigitation. One good example is the ability to define multiple P and N row pairs and then symbolically chain and fold the transistors such that you get them to fit neatly in the rows. This is a key feature that allows you to not only control the aspect ratio of the design, but to very rapidly create a custom digital cell layout, as shown in Figure 1.

SED_Multi_2_croppped

Figure 1. Multiple Row Pairs

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What’s Really Needed for FinFET Layout (Part 1)

Tuesday, May 10th, 2016

Over the last series of blogs we have looked at which tools the layout engineer has available to him/her to help deal with the complexity of doing layout with FinFETs. Even though there are tools that help, the fact is there is still a productivity hit when comparing the time it takes to do a FinFET-based layout vs. a planar CMOS layout. When I asked my layout colleagues “How much longer does it take to do a FinFET-based design vs. planar CMOS?”, they said it takes 2-3X longer.

So, if we are to recoup layout productivity when doing a FinFET-based design, which areas should we focus on? Well, let’s start at the very beginning, which, according to Julie Andrews in The Sound of Music, is a very good place to start. The task of generating the devices and placing them such that they meet all the design rules and will produce a robust working design is about 30% of the layout time. So if we can speed up this task then we will gain back some of the productivity we lost due to the complexity of the FinFET process.
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