登录查看更多内容

How can you design a CMOS circuit with the best layout?

由人工智能和领英社区提供技术支持

CMOS circuits are widely used in digital electronics, but designing them requires careful attention to the layout of the transistors, wires, and other components. A good layout can improve the performance, reliability, and power efficiency of your circuit, while a bad layout can cause noise, cross-talk, parasitic effects, and errors. In this article, you will learn how to design a CMOS circuit with the best layout, following some basic principles and techniques.

此文章中的业界达人

由社区从 4 条内容中精选。了解更多

Pooja Kumawat

ASIC Engineer @ NVIDIA | Intel Corporation | NXP Semiconductors | IIT BHU
Presanna Govindaraj

1 Choose the right technology

The first step in designing a CMOS circuit is to choose the right technology for your application. There are different types of CMOS technologies, such as standard CMOS, low-power CMOS, high-speed CMOS, and so on. Each technology has its own advantages and disadvantages, depending on the trade-offs between speed, power, area, and cost. You should select the technology that matches your specifications and constraints, and use the corresponding design rules, libraries, and tools.

添加您的观点

Presanna Govindaraj
举报内容
Achieving an optimal CMOS circuit layout involves meticulous considerations. Begin by adhering to proper design rules, ensuring symmetry and balance in transistor placement. Implement well-thought-out power distribution and ground routing to minimize signal propagation delays and enhance overall performance. Employ efficient clock distribution strategies to mitigate skew and maintain synchronization. Utilize common centroid techniques for matched transistors, reducing process variations. Additionally, optimize interconnect lengths, minimize parasitic capacitance, and employ shielding techniques to enhance noise immunity, resulting in a robust CMOS circuit layout with superior performance and reliability.

已翻译

赞

2 Plan the topology

The next step is to plan the topology of your circuit, which means how you will arrange the transistors, inputs, outputs, and logic functions. A good topology can simplify the layout and reduce the complexity and size of your circuit. You should try to minimize the number of transistors, gates, and interconnections, and use standard cells and modules whenever possible. You should also consider the critical paths, the fan-out, and the load capacitance of your circuit, and optimize them for speed and power.

添加您的观点

3 Draw the schematic

The third step is to draw the schematic of your circuit, which is a graphical representation of the topology and the connections between the components. The schematic should be clear, accurate, and consistent with the design rules and the technology parameters. You should use symbols, labels, and annotations to identify the components and their functions, and use nets, buses, and ports to show the electrical connections. You should also verify the functionality and performance of your circuit by simulating the schematic with appropriate models and test vectors.

添加您的观点

Pooja Kumawat

ASIC Engineer @ NVIDIA | Intel Corporation | NXP Semiconductors | IIT BHU
举报内容
A schematic diagram uses standardized symbols and lines to represent the components of a process, device, object and their connectivity in a simplified way. Simulating a schematic is much faster and cheaper than building and testing a physical prototype, making it an efficient way to verify its functionality and identify potential issues. Schematics are designed to help designers, collaborators, and reviewers understand the overall logic and signal flow of a system.

已翻译

赞

加载更多内容

4 Generate the layout

The fourth step is to generate the layout of your circuit, which is a physical representation of the schematic and the placement of the components on the chip. The layout should follow the design rules and the technology constraints, and match the schematic in terms of functionality and connectivity. You can use automatic or manual methods to generate the layout, or a combination of both. You should use grids, layers, and masks to define the shapes and sizes of the transistors, wires, contacts, and vias, and use alignment marks, pads, and pins to facilitate the fabrication and testing of your circuit.

添加您的观点

Pooja Kumawat

ASIC Engineer @ NVIDIA | Intel Corporation | NXP Semiconductors | IIT BHU
举报内容
Layout Generation: Layout refers to the physical arrangement and interconnection of electronic components on a silicon chip. It is generated using inputs from: 1?? Foundry: To use specific technology 2?? Frontend designers: To take synthesized netlist for functionality 3?? Library vendors: To take timing/physical information of standard cells.

已翻译

赞

5 Check the layout

The fifth step is to check the layout of your circuit, which is a quality assurance process to ensure that the layout meets the specifications and the requirements. You should perform various checks on your layout, such as design rule check (DRC), layout versus schematic (LVS), parasitic extraction (PEX), and electrical rule check (ERC). These checks can identify and correct any errors, inconsistencies, or violations in your layout, and provide feedback on the performance and reliability of your circuit.

添加您的观点

6 Optimize the layout

The final step is to optimize the layout of your circuit, which is an improvement process to enhance the characteristics and the features of your circuit. You should perform various optimizations on your layout, such as area optimization, power optimization, timing optimization, and noise optimization. These optimizations can reduce the area, power, delay, and noise of your circuit, and increase the speed, efficiency, and robustness of your circuit. You should also consider the trade-offs and the impacts of these optimizations on your circuit, and balance them according to your goals and priorities.

添加您的观点

7 Here’s what else to consider

This is a space to share examples, stories, or insights that don’t fit into any of the previous sections. What else would you like to add?

添加您的观点

Electronic Engineering

+ 关注

给文章评分

我们借助人工智能创建了此文章。您认为这篇文章怎么样？

很棒不太好

举报此文章

查看全部

How can you design a CMOS circuit with the best layout?

1

2

3

4

5

6

7

1 Choose the right technology

2 Plan the topology

3 Draw the schematic

4 Generate the layout

5 Check the layout

6 Optimize the layout

7 Here’s what else to consider

Electronic Engineering

给文章评分

感谢您的反馈

更多Electronic Engineering相关文章

更多相关阅读内容

How can you design a CMOS circuit with the best layout?

1

2

3

4

5

6

7

1 Choose the right technology

2 Plan the topology

3 Draw the schematic

4 Generate the layout

5 Check the layout

6 Optimize the layout

7 Here’s what else to consider

Electronic Engineering

给文章评分

感谢您的反馈

查看其他技能