Level Shifter Timing Compensation for Duty Cycle Skew
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Solution Overview
Problem
In semiconductor systems, the increasing operating speed leads to signals with higher frequencies and smaller amplitudes, causing distortion in duty ratio and phase skew when transmitted or received through typical transmission circuits or level shifters.
Innovation Solution
A transmission and reception system is designed with a transmission circuit that outputs a transmission signal with a complementary duty cycle offset to the reception circuit, which includes multiple driver circuits and level shifters with different duty cycle offsets to adjust and shift the voltage level of the signal effectively.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If a typical level shifter is used to change voltage level, then voltage level conversion is achieved, but duty cycle distortion and phase skew occur
Solution Approach 1:
The patent changes the operating parameters of the level shifter by introducing a control signal that adjusts the switching timing of the transmission and reception circuits. This parameter adjustment compensates for the duty cycle distortion and phase skew that occur during voltage level conversion, thereby maintaining signal integrity while achieving voltage level change.
Solution Approach 2:
The patent implements a feedback mechanism where the duty cycle offset detected in the reception circuit is used to adjust the transmission circuit's operation. By monitoring the duty cycle distortion and phase skew effects, the system dynamically adjusts the control signal to minimize these distortions, ensuring accurate duty cycle maintenance during voltage level conversion.
2Speed
If operating speed is improved, then signal frequency increases, but duty cycle distortion and phase skew worsen
Solution Approach 1:
The patent introduces dynamic control to the level shifter operation by using a control signal that adapts to the operating conditions. This dynamic adjustment allows the system to maintain signal accuracy even at higher operating speeds by compensating for the increased duty cycle distortion and phase skew that occur at higher frequencies.
Solution Approach 2:
The patent changes the timing parameters of the switching circuits based on the operating speed. By adjusting the switching timing and duration dynamically, the system compensates for the duty cycle distortion and phase skew that worsen with increased operating speed, thereby maintaining signal accuracy across different speed conditions.
Data Source
AI summary
A transmission and reception system includes a transmission circuit and a reception circuit. The transmission circuit is configured to generate a transmission signal based on an input signal. The reception circuit is configured to generate an output signal based on the transmission signal. The transmission circuit is configured to provide a duty cycle offset which is complementary with a duty cycle offset of the reception circuit.