Design of a Cascade Self-abiasing Bandgap Reference
Zhenhai Chen · Electronics & Packaging · 2010
A bandgap reference of low temperature coefficient,low-power and high PSRR is designed that is based on theory of bandgap reference for digital circuits whose power supply is 1.2V on a SoC chip,The Circuit structure consists of a proportional to absolute temperature(PTAT) current source and a complementary to absolute temperature(CTAT) current source,which adopts low-voltage cascode self-biasing structure to reduce the mirror mismatch and technology errors effect on the circuit.The schematic simulation is by the tools of Cadence Spectre with SMIC 0.13μm mixed-signal CMOS technology at power supply of 2.5V.The simulation results shows the output voltage is 1.2V,PSRR of low frequency is -86dB,PSRR of high frequency is -53dB,the temperature coefficient is 12×10-6/℃,the power dissipation is 0.57mW.The area of bandgap reference layout is 75 μ m×86 μ m.