Four-Phase Clock Generator Layout for Lower Current and Delay
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Solution Overview
Problem
The layout of driver circuits for high-frequency and low-frequency clock signals in semiconductor devices like DRAMs leads to increased consumption current due to long clock lines, necessitating a method to optimize their placement.
Innovation Solution
A layout design for clock signal generation circuits in semiconductor devices that includes symmetrical placement of clock drivers and power supply switching circuits, minimizing the length of clock paths and ensuring stable power supply, thereby reducing consumption current and preventing signal delay.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Use of energy by moving object
If driver circuits for high-frequency and low-frequency clock signals are provided to reduce consumption current, then consumption current is reduced, but the layout becomes more complex and clock line length increases
Solution Approach 1:
The patent combines the high-frequency clock driver and low-frequency clock driver into a single integrated circuit structure. The first clock driver generates both high-frequency and low-frequency clock signals by switching operation modes, eliminating the need for separate driver circuits and reducing layout complexity while maintaining low consumption current characteristics.
Solution Approach 2:
The first clock driver is designed with multi-functionality to serve multiple purposes: it can operate in high-frequency mode for read operations and in low-frequency mode for write operations. This universal design allows a single circuit to replace what would traditionally require separate dedicated drivers, simplifying the overall layout.
2Length of stationary object
If driver circuits are provided to drive long clock lines, then clock signals can be delivered to remote locations, but the size of the driver circuit increases and consumption current increases
Solution Approach 1:
The clock driver employs dynamic operation mode switching to adapt its behavior based on the required clock line length and signal requirements. By transitioning between high-frequency and low-frequency modes, the circuit optimizes its performance for different clock line lengths without requiring a permanently oversized driver design, thus controlling consumption current.
Solution Approach 2:
The patent changes operational parameters (frequency, drive strength) of the clock driver based on the specific application requirements. When driving long clock lines, the circuit adjusts its operating parameters to maintain signal integrity while minimizing power consumption, rather than using a fixed high-power design that would continuously increase consumption current.
3Area of stationary object
If clock lines are made longer to reach remote circuitry, then more circuitry can be connected, but signal delay increases and manufacturing precision requirements increase
Solution Approach 1:
The clock driver incorporates feedback mechanisms that monitor the actual clock signal characteristics and adjust its operation accordingly. This feedback allows the circuit to compensate for delays introduced by longer clock lines, maintaining timing precision even as the circuit coverage area increases.
Solution Approach 2:
The patent implements preliminary clock signal conditioning and phase adjustment in the driver circuit before the signals travel through long clock lines. By preparing and pre-adjusting the clock signals at the source, the circuit compensates for potential delays and maintains timing precision throughout the extended clock distribution paths.
Data Source
AI summary
An example apparatus includes a clock driver circuit block having a first region on which a dividing circuit generating a divided clock signal is located, a second region on which a write clock driver outputting a write clock signal is located, a third region on which a first read clock driver outputting a first read clock signal having higher frequency is located, and a fourth region on which a second read clock driver outputting a second read clock signal having lower frequency is located. The distance between the first region and the third region is longer than the distance between the first region and the second region and shorter than the distance between the first region and the fourth region.