A New Current-Mode Subthreshold, High-PSRR MOSFET-Only Bandgap Voltage Reference

A new CMOS MOSFET-only bandgap voltage reference that operates at low voltage, provides low power, and is insensitive to temperature changes, is presented in this paper. To save chip area and simplify the design, the circuit is implemented with subthreshold MOSFETs instead of bulky Bipolar junction transistors (BJT). The circuit, designed using 130 nm CMOS technology, generates a voltage reference of 593 mV and a temperature coefficient of 7S ppm in the range of-2 $0^{\circ}\mathrm{C}$ to $90^{\circ}\mathrm{C}$, without trimmings. Post-layout simulation results show that the circuit achieves a high power supply rejection ratio (PSRR) of -87dB at low frequencies. The proposed circuit draws a current of 3.7 $\mu$A from a 1.2 V power supply.