模拟IC设计技巧：Cadence Virtuoso Schematic电路原理图编辑

Cadence Virtuoso Schematic: Advanced Editing Techniques in Analog IC Design

Introduction

The design and manipulation of analog integrated circuits (ICs) in Cadence Virtuoso, a renowned highspeed digital and analog circuit simulation and design software, demand a deep understanding of both the tool's capabilities and efficient use of keyboard shortcuts and mouse operations. This paper aims to delve into advanced editing techniques for creating and managing schematic diagrams within the Virtuoso environment, focusing on essential tools that significantly enhance design efficiency and accuracy.




Mouse Operations

Single Click: Utilized for selecting a single component or confirming an action. Pressing the left mouse button once selects the component at the point of click, facilitating its isolation for detailed manipulation or execution of specific commands.

Mouse Drag: A longer press of the left mouse button enables the selection of multiple components within a region. This feature is particularly useful for selecting entire groups of components requiring similar processing or modification.

Double Click: Engages a contextsensitive editing mode or selects a component, dependent on the current focus. This action is pivotal for diving deeper into componentlevel modifications without having to navigate through the component libraries manually.

Right Click: Activates extended options and operations tailored for selected components or areas, offering customization beyond the standard interface.

Scroll Wheel: Allows for fine control over the visual layout of the schematic by enabling zooming in and out, facilitating both macro and micro view adjustments without switching between external tools or modes.

Keyboard Shortcuts

The Cadence Virtuoso Ribbon menu provides a strong integration between visual and keyboardbased commands, ensuring flexibility and customization. Selecting and executing common actions are mirrored by corresponding快捷键, making the design process more efficient:

Display [and] [f]: `f` key functionally adjusts the view size, ensuring the schematic optimally occupies the display space without manual resizing or adjusting the scale.

Zoom to Selection (o): The `o` key automatically adjusts the zoom, scaling the schematic to precisely match the selected component or area, ensuring meticulous detail and control over complex circuits.

High Brightness Net Display: Utilizing `display dimming` in conjunction with the `i` key effectively highlights connections, enabling a clearer visualization of circuit operation and facilitating the identification of complex nets within sophisticated analog IC designs.

Circuit Element Creation and Management

The creation and management of circuit elements in Cadence Virtuoso is streamlined through its intuitive interface and a rich set of shortcuts:

Adding Components: By pressing `i`, directly creates a component from the library, where you can instantly populate the circuit diagram with readytouse elements. Optionally, the software provides for the automatic creation of lines connecting the component's pins, enhancing efficiency during initial circuit layout.

Assignment and Editing: The `q` key proves invaluable for editing properties like labeling, color, and weight of a selected component, enabling rapid adjustments without leaving the design workflow. The `apply to` option further simplifies the process, applying changes to multiple components simultaneously, enhancing uniformity throughout the circuit.

Hierarchical Construction: Strategically employing pin and net names ensures that connections are correctly managed, simplifying the circuit's layout and aiding in the identification of redundant or unnecessary links within the schematic.

Advanced Editing and Customization

The toolkit in Cadence Virtuoso encompasses numerous features designed to facilitate advanced editing and customization tailored to the designer's needs:

Selective Object Handling: Tools like `Shift` + dragging components perform nondestructive moves that respect existing connections, facilitating refined layout adjustments without the need for manual tracing or disconnection of pins. Similarly, `Ctrl` + `Shift` offers a combination to clone component instances with the new connection state, accelerating the design of equivalent circuit configurations.

Completion and Propagation: Employing `Ctrl + D` for deselecting components allows better control over the drawing area, while selecting connected nets with `Ctrl + Mouse Wheel` provides exceptionally fast navigation across the schematic, streamlining error checking and verification.

Conclusion

Mastering Cadence Virtuoso's advanced editing capabilities significantly enhances the analog IC design process, enabling designers to create scalable, maintainable, and errorfree circuits. The combination of powerful mouse interactions and streamlined keyboard shortcuts empowers users to realize complex analog design visions with speed and precision, fostering innovation in the semiconductor industry. Through diligent practice and the application of these techniques, designers can significantly boost their productivity and achieve excellence in circuit design and realization with Cadence Virtuoso.

Acknowledgment

Additional insights and content can be accessed through the official Cadence resources and supplementary materials provided on the [WithB](https://weixin.qq.com/) platform, encouraging further exploration and engagement with the analog design community.