A CMOS subbandgap reference circuit with 1-v power supply voltage

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 /spl Delta/V/sub 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 standard 0.5-/spl mu/m CMOS process, and its size is 940 /spl mu/m/spl times/1160/spl mu/m. The temperature coefficient is 17 ppm from -40/spl deg/C to 125/spl deg/C after resistor trimming and the minimum power supply voltage is 0.95 V. The measured total current consumption is below 10 /spl mu/A and the measured output voltage is 0.631 V at room temperature.

[1]  J. Fellrath,et al.  CMOS analog integrated circuits based on weak inversion operations , 1977 .

[2]  J.E. Schroeder,et al.  Analog CMOS Building Blocks for Custom and Semicustom Applications , 1984, IEEE Journal of Solid-State Circuits.

[3]  Gerard C. M. Meijer.  Thermal sensors based on transistors , 1986 .

[4]  R. Castello,et al.  A Floating CMOS Bandgap Voltage Reference For Differential Applications , 1988, ESSCIRC '88: Fourteenth European Solid-State Circuits Conference.

[5]  Robert G. Meyer,et al.  Analysis and Design of Analog Integrated Circuits , 1993 .

[6]  R. Jacob Baker,et al.  CMOS Circuit Design, Layout, and Simulation , 1997 .

[7]  Anantha P. Chandrakasan,et al.  Low-Power CMOS Design , 1997 .

[8]  A.-J. Annema,et al.  Low-power bandgap references featuring DTMOSTs , 1999, Proceedings of the 24th European Solid-State Circuits Conference.

[9]  K. Sakui,et al.  A CMOS bandgap reference circuit with sub-1-V operation , 1999 .

[10]  C. Fiocchi,et al.  Curvature compensated BiCMOS bandgap with 1 V supply voltage , 2001, Proceedings of the 26th European Solid-State Circuits Conference.

[11]  G. Palumbo,et al.  A low-voltage low-power voltage reference based on subthreshold MOSFETs , 2003, IEEE J. Solid State Circuits.