Dynamic Buffer Circuit for Semiconductor Clock Signal Propagation
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Solution Overview
Problem
Current semiconductor apparatuses face challenges in efficiently propagating clock signals with varying frequencies while optimizing power consumption, as existing buffers like CML and CMOS have limitations in handling high-frequency signals without loss and are inefficient in power usage.
Innovation Solution
A semiconductor apparatus is designed with a frequency detector and multiple frequency control signal generators that adjust the gain of a clock receiver and select appropriate clock paths based on frequency information, allowing for efficient propagation of clock signals at both high and low frequencies.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If CML buffer is used for high frequency clock signal propagation, then data communication rate is improved, but power consumption increases
Solution Approach 1:
The patent implements dynamic buffer selection that adapts to clock signal frequency. The system switches between CML buffers (for high frequency) and CMOS buffers (for low frequency) based on detected clock frequency, making the buffer configuration dynamic rather than static. This resolves the contradiction by optimizing both speed and power consumption according to operating conditions.
Solution Approach 2:
The patent changes the operational parameters of the buffer circuit based on clock frequency. By detecting the clock frequency and adjusting which buffer type is activated, the system optimizes the balance between data communication rate and power consumption. Different buffer types are selected based on frequency parameters to achieve optimal performance.
2Use of energy by moving object
If CMOS buffer is used for low frequency clock signal propagation, then power consumption is reduced, but signal transmission capability at high frequency deteriorates
Solution Approach 1:
The system dynamically selects buffer types based on detected clock frequency. When low frequency is detected, CMOS buffers are activated for power efficiency. When high frequency is detected, CML buffers are activated to ensure reliable signal transmission. This dynamic adaptation resolves the contradiction between power consumption and transmission capability.
Solution Approach 2:
The frequency detector acts as an intermediary that monitors clock frequency and controls the selection between different buffer types. This intermediary component enables the system to automatically choose the appropriate buffer (CMOS or CML) based on frequency conditions, ensuring both power efficiency and transmission reliability are maintained.
3Adaptability or versatility
If frequency-dependent buffer selection is implemented, then optimization of power consumption and signal propagation is improved, but device complexity increases
Solution Approach 1:
The clock path is segmented into multiple parallel paths, each containing buffers of different types (CML and CMOS). The frequency detector divides the single clock input into multiple clock signals that can be routed through different buffer segments based on frequency conditions. This segmentation allows independent optimization of each path while maintaining overall system functionality.
Solution Approach 2:
The buffer circuit is designed with multi-functionality, incorporating both CML and CMOS buffers within the same circuit architecture. This universal design allows the system to handle both high-frequency and low-frequency operations with a single integrated circuit, reducing the need for external components and simplifying the overall system despite the increased internal complexity.
Data Source
AI summary
A semiconductor apparatus includes a frequency control circuit and an internal clock generation circuit. The frequency control circuit generates a frequency information signal based on a command address signal, and generates a frequency control signal by comparing the frequency information signal with a frequency setting signal. The internal clock generation circuit generates an internal clock signal from a system clock signal based on the frequency control signal.