A Novel Low Temperature Coefficient Band-gap Reference without Resistors

摘要

This paper describes a new band-gap reference (BGR) without resistors that can be fabricated in a 0.35μm digital CMOS technology. The proposed circuit uses differential amplifier to reduce the current mirror errors dependent on the supply voltage and temperature, so as to produce a temperature insensitive gain applied to the proportional to absolute temperature (PTAT) term in the reference. The simulation results with Spice indicate that the proposed BGR circuit has a higher power supply rejection ratio (PSRR) and low temperature coefficient (TC). The fluctuation of the output reference voltage is less than 9 mV when the power voltage changes from 2.4V to 5.0V and the output voltage of the new circuit has a maximum variation of ± 5.5 mV in larger range from -25 to 125°C.