A Low-Power Self-Startup Bandgap Circuit for Energy Efficient Applications

Abstract

Recently, most of researchers focus on low-power design for monitoring, and controlling different smart platforms. Generating reference voltages for power conditioning of these systems is one of the main design challenges of these systems. Therefore, bandgap reference (BGR) is required for providing a temperature, and supply independent reference voltage. This paper presents a CMOS lowvoltageself-startup BGR circuit with improved power supply rejection ratio (PSRR). The proposed self-startup BGR circuit is based on the relation of a proportional to absolute temperature (PTAT), and complementary to absolute temperature (CTAT) references. A low-power BGR is implemented in 0.13 µm CMOS technology. The implemented BGR generates a reference voltage of 0.8 V, and consumes 9.5 µA form 3.3 V battery. Moreover, it achieves a high PSRR of 76 dB at 1KHz, while the temperature coefficient is 20 ppm/℃.