For automotive camera applications involving digital image sensor supply various design elements. In rain, snow, fog, and other difficult driving conditions, high levels of image quality is essential. Car driver when reversing the degree of dependence on technology is much higher than visual inspection. If a low-noise analog power rail demand, efficiency and size and other major design elements can not be optimized, then the operation in good weather conditions may not be a good solution for harsh weather conditions.
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Design Elements
For automotive camera applications involving digital image sensor supply various design elements. Image quality is an important indicator of whether the application can be profitable class. In rain, snow, fog, and other difficult driving conditions, high levels of image quality is essential. Car driver when reversing the degree of dependence on technology is much higher than visual inspection. If a low-noise analog power rail demand, efficiency and size and other major design elements can not be optimized, then the operation in good weather conditions may not be a good solution for harsh weather conditions.
Advanced Driver Assistance Systems
For example, AptinaAR0132 is a universal sensor with 1.2 million pixels and and 720p60 resolution, support for high dynamic range imaging for automotive advanced driver assistance systems (ADAS) and the surrounding view / parking assist camera applications. Where the kernel (VDD) and I / O section (VDD_IO) require 1.8V voltage, analog part (VAA, VAA_PIX and VDD_PLL) require 2.8V voltage. Obviously, the analog portion of the chip is more easily affected by power line noise. Many designs use a low dropout regulator (LDO) will be downconverted all power from the 5V input rail.
Design goals
The overall objective is to provide a practical embodiment of the power supply system for AR0132AT image sensor, it successfully integrated into automotive applications and packages. Although the details of the other sensors and systems may be different, but the principles discussed in this paper have general applicability.
Size of the image sensor is very important because it must be incorporated into 25 mm cube in which the overall efficiency and good thermal management make high demands. Despite having a low noise LDO output, but its power consumption is high, will the image sensor heating, resulting in adverse effects, so the 25 mm cube in the work is not satisfactory.
Power switching power supply solutions is much lower, but with higher output ripple and noise in nature. In implementing the switching power supply solutions that require additional attention to its image sensor analog input noise power supply rail (ripple) sensitivity.
Design Process
Is designed for image sensor capable of efficient power supply system, it is necessary to know the sensor sensitivity level and switching power supply ripple output in order to take appropriate steps to ripple design on the sensor supply rail drops below the threshold degradation.
