Summary: 252 IEEE JOURNAL OF SOLID-STATE CIRCUITS, VOL. 39, NO. 1, JANUARY 2004
A CMOS Subbandgap Reference Circuit With 1-V Power Supply Voltage
J. Doyle, Senior Member, IEEE, Young Jun Lee, Student Member, IEEE, Yong-Bin Kim, Senior Member, IEEE,
H. Wilsch, Member, IEEE, and F. Lombardi, Senior Member, IEEE
Abstract--A CMOS subbandgap reference circuit with 1-V
supply voltage is described. To obtain subbandgap reference
voltages with a 1-V supply voltage, threshold voltage reduction
and subthreshold operation techniques are used. Large 1 BE
(100 mV) as well as a 90-dB operational amplifier are used to
circumvent the amplifier offset. A power-on-reset (POR) circuit is
used as startup. This circuit has been implemented using a stan-
dard 0.5- m CMOS process, and its size is 940 m 1160 m.
The temperature coefficient is 17 ppm from 40 C to 125 C
after resistor trimming and the minimum power supply voltage is
0.95 V. The measured total current consumption is below 10 A
and the measured output voltage is 0.631 V at room temperature.
Index Terms--CMOS, current source, power-on-reset (POR)
circuit, subbandgap reference voltage circuit, subthreshold
operation, stability, temperature sensitivity.