Sigma-Delta ADC for Image Sensor in Virtual and Augmented Reality Camera to Medical Training

This article presents a continuous time lowpass sigma-delta ADC for wide field of view (FOV) image sensor with a chain of integrators and with capacitive feedforward summation (CICFF) plus circuit which is an ideal function for implementation in low power applications. The summation of feedforward signals is achieved by capacitors plus, without the essential thing of any extra active components which can be used in virtual reality (VR) and augmented reality (AR) camera. The quantizer uses a comparator which can achieve high linearity easily. The chip was implemented in 1.8 V supply voltage which works as a part of CMOS active-pixel image sensor with global shutter and high dynamic range (HDR) operation. The proposed idea can support medical training.