Dynamic equalization and fast settling based wide operating voltage range 93 dB PSRR PTAT current reference

摘要

This paper presents a novel PTAT current reference with fast settling behavior and high PSRR in UMC 110 nm technology. In addition to a classic voltage-clamp operational amplifier for forming Delta V-BE/R, a novel extra operational amplifier with functions of current dynamic equalization and automatic active fast start-up and shutoff is introduced to enhance the settling behavior and current matching accuracy. Results have shown that more than 93 dB PSRR across the temperature range of -40-85 degrees C is achieved. The complete design consumes a total current of 22.03 mu A from a 2.5 V power supply with only 20% in auxiliary circuits, and correct and seamless transition from off state to steady state is realized.