Reconfigurable Laser Pulse Circuit for Parasitic Delay Compensation
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Solution Overview
Problem
Time-of-flight-based measurement systems, such as 3D sensing and LIDAR, face challenges in generating optical pulses with short rise and fall times to improve measurement precision, as parasitic inductance and capacitance in electrical drive circuits increase pulse rise times, leading to non-rectangular pulse shapes.
Innovation Solution
An electrical drive circuit that charges inductive elements and generates a main electrical pulse, with a compensation pulse during a overlapping time interval, combining these pulses to drive an optical load and emit rectangular-shaped optical pulses, utilizing a capacitive element in series and controlled switches to minimize parasitic effects.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Speed
If conventional electrical drive circuits are used to drive optical loads, then the circuit structure is simple, but the pulse rise time is long due to parasitic inductance and capacitance
Solution Approach 1:
The drive circuit is divided into multiple independent modules: a main drive circuit that generates the primary current pulse, and a compensation circuit that generates a compensating current pulse. This segmentation allows each module to be optimized independently for its specific function, with the compensation circuit specifically designed to counteract parasitic effects and achieve fast rise times
Solution Approach 2:
A compensation circuit acts as an intermediary between the main drive circuit and the optical load. This intermediate stage generates a compensating current that counteracts the delayed current from the main drive circuit, effectively canceling out the parasitic inductance and capacitance effects and producing a rectangular pulse shape
2Measurement precision
If parasitic effects are not compensated, then the circuit operation is simple, but the pulse shape becomes non-rectangular and measurement precision deteriorates
Solution Approach 1:
The compensation circuit is designed to sense the delayed current effects from parasitic elements and generate a compensating signal in response. This feedback mechanism continuously counteracts the parasitic effects during pulse generation, ensuring rectangular pulse shapes and maintaining high measurement precision without requiring complex external calibration
Solution Approach 2:
The circuit dynamically adjusts current parameters by generating a compensating current pulse with specific amplitude and timing characteristics. The compensation circuit changes the current waveform parameters to counteract the parasitic effects, transforming the distorted pulse back into a rectangular shape suitable for precise time-of-flight measurements
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The solution enables the optical load to emit pulses with short rise times (less than 100 ps) and fall times (less than 500 ps), improving the precision and accuracy of time-of-flight measurements by compensating for parasitic delays, thus enhancing the performance of time-of-flight-based systems.
Implementation Method 1
charging, by an electrical drive circuit, one or more inductive elements... discharging, by the electrical drive circuit, after the charging, and for a second time interval, the one or more inductive elements to provide a compensation electrical pulse
Implementation Method 2
the electrical drive circuit includes a capacitive element in series between the one or more inductive elements and an optical load
Data Source
AI summary
An electrical drive circuit may charge one or more inductive elements, where the electrical drive circuit includes the one or more inductive elements and a capacitive element in series between the one or more inductive elements and the optical load, and where the electrical drive circuit is connected to one or more sources. The electrical drive circuit may generate, after the charging and for a first time interval, a main electrical pulse. The electrical drive circuit may discharge, after the charging and for a second time interval, the one or more inductive elements to provide a compensation electrical pulse, where at least a portion of the second time interval overlaps with the first time interval. The electrical drive circuit may combine the main electrical pulse and the compensation electrical pulse into a combined electrical pulse. The electrical drive circuit may provide the combined electrical pulse to the optical load.