Dynamic Bias Current Scaling in Image Sensor Analog Circuits

The patent implements dynamic bias current scaling that adjusts the bias current level according to the operational mode. During still image capture, higher bias current maintains optimal signal processing performance, while during video recording or lower-performance modes, the bias current is reduced to decrease power consumption while maintaining adequate performance for the application.

The patent applies different bias current levels to different operational modes and potentially different circuit blocks within the analog signal processing chain. This allows each circuit to operate with the minimum necessary current for its specific function and operating condition, optimizing the balance between performance and power consumption locally rather than uniformly across the entire system.

The patent employs dynamic bias current scaling that responds to operational mode changes. The bias current is reduced only when the operating mode permits (such as during video recording or lower-resolution modes), while maintaining higher current levels during still image capture when maximum performance is required. This dynamic adaptation ensures power savings without permanently compromising signal processing capability.

The patent implements periodic or mode-based adjustment of bias current levels, switching between high and low current states according to the operational requirements. This allows the system to alternate between power-efficient operation and high-performance operation based on the current task, achieving overall power reduction while maintaining necessary capability when needed.