Cadence Inverter layout lambda based design

In summary, when creating a layout of a CMOS inverter in Cadence Virtuoso using 0.18um technology, the recommended contact size is 2Lambda x 2Lambda, which is 0.18um x 0.18um. However, it is possible that the LVS check may throw an error if the contact size is not 0.22um x 0.22um. This could be due to using a not-well-supported kit for an older process like 0.18um. It is suggested to increase the contact size to 0.22um x 0.22um for a clean layout.
  • #1
reddvoid
119
1
I am creating layout of cmos inverter in cadence virtuoso
using 0.18um technology. channel length is 2Lambda = 0.18um
I read that contact should be 2Lamda X 2Lambda
that is 0.18um X 0.18um right
but my LVS Check is throwing error telling that contact must be 0.22umX0.22um
whats might be the reason ?
 
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  • #2
It depends on the technology. For an older process like 0.18um the kit should be well debugged but maybe you're using a not-well-supported kit (since you're using the lambda rules.

Making a contact larger than minimum is never a problem so I advise you increase the size of the contact to 0.22umx0.2um to get a clean layout.
 

1. What is a Cadence Inverter layout lambda based design?

A Cadence Inverter layout lambda based design is a type of electronic circuit design that uses a specific unit of measurement, called lambda, to determine the physical dimensions of transistors and other components within the circuit. This design methodology is commonly used in the design of integrated circuits, allowing for precise and consistent sizing of components.

2. How does a Cadence Inverter layout lambda based design differ from other design methods?

Unlike other design methods that use relative measurements or arbitrary units, a Cadence Inverter layout lambda based design uses a fixed unit of measurement (lambda) to determine the size of components. This allows for more accurate and consistent designs, especially when working with small and complex circuits.

3. What are the benefits of using a Cadence Inverter layout lambda based design?

There are several benefits to using a Cadence Inverter layout lambda based design. First, it allows for precise and consistent sizing of components, which can improve the overall performance and reliability of the circuit. Additionally, using lambda-based design can reduce design time and increase design efficiency, as it eliminates the need for manual calculations and adjustments.

4. Are there any limitations to using a Cadence Inverter layout lambda based design?

While lambda-based design offers many benefits, there are some limitations to consider. This design methodology may be more complex and require specialized tools and software, making it less accessible for beginners. Additionally, lambda-based design may not be suitable for all types of circuits and may not be as flexible as other design methods.

5. What are some best practices for implementing a Cadence Inverter layout lambda based design?

To effectively utilize a Cadence Inverter layout lambda based design, it is important to follow certain best practices. This includes understanding the lambda values for different processes and technologies, using appropriate design rules and guidelines, and verifying the design through simulations and testing. It is also important to stay updated on industry standards and advancements in lambda-based design techniques.

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