A Sub-1 V, 26 $mu$W, Low-Output-Impedance CMOS Bandgap Reference With a Low Dropout or Source Follower Mode

摘要

We present a low-power bandgap reference (BGR), functional from sub-1 V to 5 V supply voltage with either a low dropout (LDO) regulator or source follower (SF) output stage, denoted as the LDO or SF mode, in a 0.5-$mu$m standard digital CMOS process with $V_{tn}approx$ 0.6 V and $vert V_{tp}vert approx$ 0.7 V at 27 $^{circ}$C. Both modes operate at sub-1 V under zero load with a power consumption of around 26 $mu$W. At 1 V (1.1 V) supply, the LDO (SF) mode provides an output current up to 1.1 mA (0.35 mA), a load regulation of ${pm}$8.5 mV/mA (${pm}$33 mV/mA) with approximately 10 $mu$ s transient, a line regulation of ${pm}$4.2 mV/V ( ${pm}{hbox {50}} mu$V/V), and a temperature compensated reference voltage of 0.228 V (0.235 V) with a temperature coefficient around 34 ppm/$^{circ}$ C from ${-}{hbox {20}}, ^{circ}$C to 120 $^{circ}$C. At 1.5 V supply, the LDO (SF) mode can further drive up to 9.6 mA (3.2 mA) before the reference voltage falls to 90% of its nominal value. Such low-supply-voltage and high-current-driving BGR in standard digital CMOS processes is highly useful in portable and switching a-n-npplications.