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Posts Tagged ‘differential pair’

Reducing Analog Cell Layout Time with the Symbolic Editor

Thursday, December 1st, 2016

Hello again!

In the last blog post I profiled the use of Custom Compiler’s Symbolic Editor for rapid digital cell layout.

In this post, we will tackle analog cell layout and show some more of the Symbolic Editor features that enable analog layout engineers to complete their layout in minutes vs. hours.

As with the digital cell layout, engineers can take advantage of the Symbolic Editor’s ability to define multiple P and N row pairs, as shown in Figure 1.

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Figure 1. Multiple Row Pairs

The preview window shows how the layout will look when realized on the layout canvas. In this example, it is clear that in order to make the design more compact, the larger transistors need to be folded.

Folding the transistors is very easy using the Symbolic Editor. Options on the toolbar allow the designer to fold the transistor by specifying either the number of segments desired or by specifying a width threshold. Once the option is set, all the layout engineer has to do is simply select the appropriate devices and have them folded such that the transistors fit neatly in the rows. Figure 2 shows how the design looks before and after folding.

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Custom Compiler Layout Assistants (Part 1)

Wednesday, June 1st, 2016

As mentioned previously, on March 30th Silicon Valley was buzzing with excitement. Synopsys revealed Custom Compiler, a fresh approach to custom design that employs visually-assisted automation technologies to speed up common design tasks, reduce iterations and enable reuse at the SNUG Silicon Valley event. During this event, the R&D folks did a walkthrough of the technology ‘under-the-hood’ and showed the audience some cool layout assistants that leverage the graphical use model familiar to layout designers while eliminating the need to write complicated code and constraints. [Click here to view the videolog of the SNUG event.]

One of the layout assistants that was shown was the symbolic editor. This really is a must-have assistant when it comes to placing devices that need to be in a specific interdigitated pattern, like a differential pair. In the schematic, it is two symbols, but in the layout it could be hundreds of devices. The symbolic editor allows device placement to be edited in an easy and graphical manner and comes with a rich collection of predefined placement patterns. If you find a placement pattern you like, you can simply use it as-is and the symbolic editor will generate a correct-by-construction placement that you can instantiate in your layout. If you don’t find an exact match, you can easily use a pattern that is similar to what you need and rearrange the placement pattern graphically. No constraints to enter, no code to write and layout is done in minutes vs. hours.
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