Image Sensing Circuit With Duty Cycle Feedback for Depth Correction

A duty cycle correction circuit is introduced as an intermediary component between the light driver and pixel driver. This circuit receives a first cycle signal for light emission and a second cycle signal for depth measurement, compares their duty cycles, and generates a corrected control signal to eliminate duty cycle inconsistencies. The intermediary circuit acts as a mediator that reconciles the timing mismatch between light emission and depth measurement operations.

The duty cycle correction circuit implements a feedback mechanism by continuously monitoring the duty cycles of the first and second cycle signals, comparing them, and adjusting the control signal accordingly. The circuit uses the depth information from the image sensor and the timing characteristics of the cycle signals to generate corrective feedback that eliminates measurement errors caused by duty cycle mismatches.

The duty cycle correction circuit is segmented into distinct functional modules: a delay circuit that generates time-shifted versions of the cycle signals, a logic circuit that performs Boolean operations on the delayed signals, and a selection circuit that chooses the appropriate corrected signal. This segmentation allows each module to be optimized independently and simplifies the manufacturing process by breaking down the complex correction function into manageable, standardized circuit blocks.

The correction circuit employs dynamic elements including adjustable delay lines and selectable logic operations that can be configured based on the specific duty cycle mismatch conditions. The circuit adapts its behavior dynamically by selecting different delay amounts and logic operations to match the actual timing characteristics of the light driver and pixel driver, making the system reliable across varying operating conditions while maintaining a relatively simple fixed hardware structure.