A LOW-POWER 13-BIT ANALOG FRONT END FOR MOBILE BATTERY MONITORING APPLICATIONS

摘要

A low-power AFE (analog front end) chip is designed and fabricated with a 13-bit resolution performance for mobile battery monitoring applications. The AFE mainly consists of the PGA (programmable gain amplifier) and ADC (analog-to-digital converter). Other functional blocks are also included such as protection flag sensors and self oscillator. The PGA provides wide-range gain values of 40dB in order to process voltage, current, and temperature of the battery. A modified ratio-independent MDAC (multiplying digital-to-analog converter) scheme is proposed in the algorithmic ADC. The chip is implemented in a 0.5-μm 2-poly 3-metal CMOS technology. Total power dissipation of the entire chip including all functional blocks is lmW for a single supply voltage higher than 4V.