Data Clock Duty-Ratio Control for Half-Rate ISI Reduction
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Solution Overview
Problem
Semiconductor systems face challenges in reducing inter-symbol interference (ISI) during data clock transmission, which affects the efficiency of data input and output operations, particularly in half-rate sections where the data clock frequency is set at half the full-speed frequency.
Innovation Solution
The semiconductor system employs a controller to adjust the duty ratio of the data clock according to the system rate in a half-rate section, generating a transmission data clock that is transmitted through a channel, and the receiving semiconductor device generates an internal data clock for data input and output operations based on the received data clock, with the option to adjust the duty ratio further based on duty adjustment signals.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Productivity
If the data clock frequency is set high to improve data input and output rates, then productivity is improved, but inter-symbol interference increases causing signal attenuation
Solution Approach 1:
The patent applies dynamics by making the data clock frequency adjustable rather than fixed. The system dynamically switches between full-speed mode (higher frequency for maximum productivity) and half-speed mode (lower frequency to reduce ISI) based on operating conditions, allowing optimal balance between data rate and signal integrity
Solution Approach 2:
The patent changes the frequency parameter of the data clock to resolve the contradiction. By operating at half the full speed in certain sections, the system reduces inter-symbol interference while maintaining acceptable data transmission performance, thus mitigating the harmful effect at the cost of reduced productivity in those sections
2Object-affected harmful factors
If the data clock frequency is reduced to minimize inter-symbol interference, then signal attenuation is reduced, but data input and output rates decrease
Solution Approach 1:
The patent segments the data transmission into different speed sections - full-speed sections for maximum throughput and half-speed sections for reduced ISI. This segmentation allows the system to optimize different portions of data transmission differently, achieving overall balance between productivity and signal quality
3Object-affected harmful factors
If the duty ratio of the data clock is adjusted to optimize transmission in half-rate sections, then signal attenuation due to inter-symbol interference is minimized, but device complexity increases
Solution Approach 1:
The patent changes the duty ratio parameter of the data clock specifically in half-rate sections to optimize signal transmission. By adjusting this temporal parameter rather than adding hardware components, the system reduces ISI effects while keeping the increase in device complexity minimal
Solution Approach 2:
The controller dynamically adjusts the duty ratio based on the operating section (half-rate vs full-rate), making the clock signal adaptable to different transmission conditions. This dynamic parameter adjustment resolves the contradiction by optimizing signal quality without requiring permanent structural modifications
Data Source
AI summary
A semiconductor system includes a controller, configured to: adjust a duty ratio of a data clock according to a system rate in a half rate section, generate a transmission data clock and, transmit the transmission data clock through a channel. The system also includes a semiconductor device configured to receive the transmission data clock through the channel as a reception data clock, and generate an internal data clock for a data input and output operation, based on the reception data clock.