Standard Cell Transistor Merging to Cut Layout Parasitics
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Solution Overview
Problem
Conventional standard cell layouts fail to consider layout parasitic resistance and parasitic capacitance during transistor placement, leading to reduced performance and increased power consumption in integrated circuits.
Innovation Solution
The creation of mega transistors by combining pairs of transistors in a common active region to form additional current paths, optimizing transistor placement and reducing layout parasitic resistance and capacitance.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional standard cell layout techniques are used, then the layout process is simple, but parasitic resistance and capacitance are not effectively reduced, leading to reduced circuit speed and increased power consumption
Solution Approach 1:
The patent merges multiple transistors into a single mega transistor structure by combining their drain terminals in a common active region. This consolidation reduces the number of separate transistor placements needed while creating additional current paths that lower parasitic resistance and capacitance, thereby improving circuit speed without proportionally increasing placement complexity
Solution Approach 2:
The patent introduces a new dimensional approach by stacking drain terminals vertically in a common active region rather than placing them horizontally adjacent to each other. This three-dimensional arrangement within the active region enables multiple current paths to coexist, reducing parasitic effects while maintaining compact layout
2Loss of energy
If conventional standard cell layout techniques are used, then the layout process is straightforward, but power consumption increases due to inadequate parasitic management
Solution Approach 1:
By combining multiple drain terminals into a shared common active region, the patent creates parallel current paths that reduce overall parasitic resistance. This merging strategy lowers the energy loss during signal transmission while the consolidated structure simplifies the overall placement complexity compared to managing multiple separate transistors
Solution Approach 2:
The patent converts the typically harmful parasitic resistance and capacitance into beneficial multiple current paths by strategically positioning drain terminals in a common active region. This transformation reduces the net parasitic effect and lowers power consumption while the structured approach keeps placement complexity manageable
3Object-affected harmful factors
If mega transistors are created by combining drain terminals in a common active region, then parasitic resistance and capacitance are reduced, but transistor placement complexity increases
Solution Approach 1:
The patent merges multiple drain terminals into a single common active region, which consolidates what would otherwise be separate placement operations. This merging reduces parasitic resistance and capacitance by creating shared current paths, while the unified structure actually simplifies placement complexity compared to managing multiple independent transistor instances
Solution Approach 2:
The common active region serves multiple functions simultaneously: it acts as the active region for multiple transistors, provides multiple current paths, and reduces parasitic effects. This multi-functionality allows a single placement structure to achieve several goals, offsetting the increased complexity with operational efficiency
4Area of stationary object
If mega transistors are created by combining drain terminals in a common active region, then cell area is minimized, but transistor placement complexity increases
Solution Approach 1:
The patent nests multiple drain terminals within a single common active region, creating a nested structure where multiple transistor elements are contained within one shared region. This nesting minimizes the total cell area by eliminating redundant active region structures, while the hierarchical organization manages placement complexity through a unified framework
Solution Approach 2:
By merging multiple drain terminals into a shared common active region, the patent consolidates the physical footprint required for multiple transistors. This combination reduces the total cell area by eliminating the need for separate active regions for each transistor, while the integrated structure simplifies the overall placement task
Data Source
AI summary
A system and method for transistor placement in a standard cell layout includes identifying a plurality of transistors in a circuit. A drain terminal of each of the plurality of transistors is connected to an output of the circuit. The system and method also include determining that a first transistor and a second transistor of the plurality of transistors satisfy a merging priority, combining an active region of the first transistor and the second transistor to form a mega transistor having a common active region, and replacing the first transistor and the second transistor in the standard cell layout of the circuit with the mega transistor. The common active region combines the active region of a first drain terminal of the first transistor and a second drain terminal of the second transistor.