Multi-Mode Clock Driver With Impedance Matching for Low Jitter
Find Innovative SolutionsGenerate Solutions
Solution Overview
Problem
Electronic systems face challenges in generating multiple clock signals with different frequencies and logic standards, requiring additional circuitry and often resulting in poor impedance matching, which leads to signal reflections and errors in high-frequency operations.
Innovation Solution
A multi-mode driver circuit that can selectively output clock signals compliant with various logic standards, including LVDS, PECL, LVPECL, CMOS, and HSTL, while minimizing additional circuit area and optimizing impedance matching to reduce jitter and signal distortion.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If multiple separate clock generators are used to produce clock signals for different logic standards, then compatibility with various logic standards (LVDS, PECL, LVPECL, CMOS) is achieved, but device complexity and circuit area increase significantly
Solution Approach 1:
The patent implements a universal clock driver circuit that can operate in multiple modes (LVDS, PECL, LVPECL, CMOS) by selectively enabling different output stages through control signals. The circuit uses a single master clock input and generates multiple logic standard outputs through mode selection, eliminating the need for separate dedicated generators for each logic standard while maintaining full compatibility across all standards.
2Adaptability or versatility
If additional circuitry is added to generate varied clock signals for different tasks, then adaptability to different logic standards is improved, but the number of circuit components and device complexity increase
Solution Approach 1:
The patent merges multiple clock generation functions into a single integrated driver circuit. The circuit combines mode selection logic, multiple output stages, and control mechanisms into one unified structure that can generate LVDS, PECL, LVPECL, and CMOS clock signals from a single master clock input, thereby reducing the total number of separate circuit components needed.
Solution Approach 2:
The circuit employs dynamic mode selection through control signals that enable or disable specific output stages based on the required logic standard. This dynamic reconfiguration allows the same hardware circuit to adapt its behavior and output characteristics in real-time without requiring separate static circuits for each mode.
3Ease of manufacture
If conventional clock distribution networks are used, then simplicity of implementation is maintained, but impedance matching deteriorates leading to signal reflections and errors in high-frequency operations
Solution Approach 1:
The patent implements mode-specific output stages tailored to the impedance requirements of each logic standard. Each output stage (LVDS, PECL, LVPECL, CMOS) is designed with specific impedance characteristics matched to its corresponding logic standard, ensuring optimal signal quality and minimizing reflections for high-frequency operations while maintaining overall circuit simplicity.
Data Source
AI summary
Apparatus and methods for providing multi-mode clock signals are disclosed. In some embodiments, a multi-mode driver configured to receive a first clock signal, and to selectively output a different clock signal in response to one or more signals from a controller is provided. The driver can include an H-bridge circuit without substantial increases in the size of the design area. Advantageously, lower jitter and improved impedance matching can be accomplished.