CMOS Comparator Driving Circuit for High-Speed LED Signals
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Solution Overview
Problem
Current LED driver ICs rely on single-ended or differential signal transmission, which limits signal transmission speed, requiring doubling of signal lines for differential signals.
Innovation Solution
A driving device comprising a complementary metal-oxide-semiconductor (CMOS) circuit and comparator that outputs power or pull-down signals and compares them with a reference signal to generate a driving signal, enhancing signal transmission speed without increasing the number of signal lines.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If differential signal transmission is used to improve signal transmission speed, then the transmission speed is improved, but the number of signal lines needs to be doubled
Solution Approach 1:
The patent segments the signal transmission function by using a single-ended signal line in combination with a reference voltage to achieve differential signal effects. The CMOS circuit divides the signal into power signal and pull-down signal components, allowing high-speed transmission without requiring separate differential pairs for each signal, thus avoiding doubling the signal line count.
Solution Approach 2:
The single-ended signal line is given multiple functions: it carries the primary signal while the complementary reference voltage provides the differential comparison function. This multi-functionality allows the system to achieve differential transmission benefits using the same physical signal line, eliminating the need for additional dedicated differential lines.
2Quantity of substance
If single-ended signal transmission is used to reduce the number of signal lines, then the number of signal lines is reduced, but the transmission speed is limited
Solution Approach 1:
The patent introduces a reference voltage as an intermediary element that mediates between the single-ended signal line and the differential comparison requirement. The comparator uses this reference voltage to create differential signal levels, enabling high-speed transmission characteristics without requiring a physical differential signal line pair.
Solution Approach 2:
The patent changes the voltage parameter characteristics by using dynamic reference voltages that switch between different levels (VDD and VSS) based on the input signal state. This parameter transformation allows the single-ended signal to convey differential information, achieving high-speed transmission equivalent to differential signaling while maintaining single-line topology.
Data Source
AI summary
A driving device comprises a first complementary metal-oxygen-semiconductor circuit and a first comparator. The first complementary metal-oxygen-semiconductor circuit is configured for outputting a power signal or a pull-down signal according to the first input signal. The first comparator comprises a first non-inverting input terminal and a first inverting input terminal. The first non-inverting input terminal is coupled to the first complementary metal-oxygen-semiconductor circuit, and is configured to receive the power signal or the pull-down signal. The first inverting input terminal is configured for receiving a first reference signal, and the first comparator is configured to compare one of the power signal and the pull-down signal and the first reference signal to provide a first driving signal.