Spread Spectrum Clock Generator for LCD EMI and Bus Congestion
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Solution Overview
Problem
As liquid crystal displays (LCDs) with increased resolution and data input bits lead to increased bus lines, data traffic jams and electromagnetic interference, existing signal processing methods like RSDS and LVDS are insufficient in addressing these issues effectively.
Innovation Solution
A spread spectrum clock generator that includes an oscillation circuit, phase lock loop, and control circuit to receive and process spread spectrum clock signals, generating a second clock signal with a new modulation rate and frequency, and controlling the phase lock loop to align the average frequency of the second clock signal with the first, thereby minimizing electromagnetic interference.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Measurement precision
If the resolution of liquid crystal displays increases and the number of data input bits increases, then the display quality improves, but the number of bus lines increases causing data traffic jams and electromagnetic interference
Solution Approach 1:
The patent applies spread spectrum clock generation technology that modulates the clock signal frequency over a wide range, changing the frequency parameters of the clock signal to distribute electromagnetic energy across a broader spectrum, thereby reducing peak electromagnetic interference while maintaining display resolution
Solution Approach 2:
The patent converts the harmful concentrated electromagnetic interference from traditional clock signals into a beneficial distributed spectrum signal, where the spread spectrum technique transforms narrowband interference into wideband low-level interference, reducing data traffic jams and electromagnetic interference effects
2Quantity of substance
If the number of bus lines increases to support higher resolution displays, then data transmission capacity improves, but data traffic jams and electromagnetic interference worsen
Solution Approach 1:
The patent changes the temporal parameters of clock signals by implementing spread spectrum modulation, which varies the clock frequency dynamically to distribute data transmission across different time intervals, thereby reducing bus line congestion and electromagnetic interference without reducing data transmission capacity
Data Source
AI summary
Spread spectrum clock generators and electronic devices including the same are provided. An electronic device may include a memory and a first circuit block configured to output a first spread spectrum clock signal and a first address for accessing the memory. The electronic device may include a second circuit block configured to operate in response to a second spread spectrum clock signal, and configured to output a second address for accessing the memory. The electronic device may include a spread spectrum clock signal generator configured to receive the first spread spectrum clock signal to generate the second spread spectrum clock signal. The memory may be configured to compare the first and second addresses to each other to output a clock generator control signal corresponding to a difference between the first and second addresses.