Distance Imaging Timing Control With DLL Phase Synchronization
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Solution Overview
Problem
Conventional distance-measuring imaging devices face limitations in accurate distance measurement due to variations in light emission and exposure timing caused by environmental changes and long-term degradation, which existing digital circuit techniques cannot fully address.
Innovation Solution
The implementation of a distance-measuring imaging device that utilizes delay-locked loop (DLL) circuits for continuous analog feedback to reduce variations in light emission and exposure timing, incorporating multiple DLL circuits to determine and synchronize the phases of rising and falling edges of control signals for precise timing control.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Device complexity
If digital circuit techniques are used for timing control, then device complexity is reduced, but measurement precision deteriorates due to inability to fully address timing variations
Solution Approach 1:
The patent implements a delay-locked loop (DLL) circuit that continuously monitors and adjusts timing signals based on feedback from phase detectors. The DLL circuit compares the phase of reference clock signals with actual light emission and exposure timing signals, generating correction signals to compensate for timing variations caused by temperature changes and aging effects, thereby maintaining high measurement precision
Solution Approach 2:
The patent employs temperature compensation techniques that dynamically adjust timing parameters based on detected temperature changes. The system measures temperature variations and modifies clock signal frequencies or delay values accordingly to counteract thermal effects on timing accuracy, enabling stable distance measurement across different operating conditions
2Device complexity
If conventional timing control is used, then device simplicity is maintained, but reliability deteriorates due to timing variations from environmental changes and long-term degradation
Solution Approach 1:
The DLL circuit establishes a closed-loop feedback system where phase detectors continuously monitor timing deviations and feed correction signals back to delay elements. This feedback mechanism automatically compensates for environmental variations and aging effects, ensuring stable timing control and high reliability without requiring complex external calibration systems
Solution Approach 2:
The patent transforms static timing control into a dynamic adaptive system. The DLL circuit continuously adjusts delay values in real-time based on actual timing conditions, allowing the system to adapt to changing environmental parameters and long-term degradation, thereby maintaining reliable operation throughout the device lifecycle
Data Source
AI summary
A distance-measuring imaging device includes: a timing controller that outputs one or more timing signals; a light receiver that receives reflected light that is light emitted by a light source and reflected by a subject; a phase adjustment circuit that outputs at least one signal out of a light emission control signal and an exposure control signal, based on the one or more timing signals, the light emission control signal being used for causing the light source to emit light to the subject, the exposure control signal being used for causing the light receiver to start exposure. The phase adjustment circuit includes one or more DLL circuits each of which determines, for at least one of the one or more timing signals, at least one of a phase of a rising edge or a phase of a falling edge of the at least one signal.