Design of SAR ADC to Light Charging for Optical Sensors Applications

Abstract

The proposed successive approximation register (SAR) analog-to-digital converter (ADC) for integrates optical sensor. The heart rate sensor including SAR ADC and OPVs are presented. To reduce DAC switching energy, a hybrid resistor-capacitor DAC is applied. The optimal design used charging near infrared laser driven (NIRLD) with thin Fresnel and OPVs light with VCSEL. The charging near infrared laser driven (NIRLD) with thin Fresnel might be a promising OPVs light power supplier and low consumption, asynchronous control logic to drive the ADC is used. A pre-amplifier-based comparator circuit is built to reduce the kickback noise from the dynamic latch designs for optical sensor applications.