A 0.8V, 37nW, 42ppm/°C sub-bandgap voltage reference with PSRR of −81dB and line sensitivity of 51ppm/V in 0.18um CMOS

This paper presents a low-power, high-PSRR sub-bandgap voltage reference that operates under 1V supply. In order to achieve low temperature coefficient (TC), a CTAT circuit with internal feedback and a two-transistor PTAT circuit are proposed. For improved line sensitivity (LS) and PSRR, a self supply-regulated feedback is employed. Implemented in 0.18μm CMOS, the proposed voltage reference achieves an average TC of 42ppm/°C, PSRR of -81dB and LS of 51ppm/V while consuming 37nW at 0.8V supply.