A 30 ? W CMOS bandgap reference featuring a 1.56mA output driving current and a Miller-effect startup circuit ?
We present a pure CMOS bandgap voltage reference with a low quiescent current and high output current driving capability. The circuit sources a driving current of up to 1.5mA with the reference voltage kept above 98.5% of its designated 1.2V, and up to 6mA before the voltage drops to 90%. The circuit achieves a very low supply current of 13 ? A , a low power of 30 ? W , a line regulation of  2.5 mV / V and a load regulation of  7 mV / mA . The reference is implemented in a 1 ? m pure CMOS process with V tn ? | V tp | ? 0.7 V at 25 ? C using substrate pnp. A startup circuit, which shuts down itself after a controlled delay using Miller effect, is also introduced. By utilizing the body effect of the input transistors, the turn-on threshold of the startup circuit is raised to about 1V, making it a perfect match for the reference architecture. Silicon measurements are in good agreement with simulations.
cmos bandgap reference startup circuit low power low voltage delay circuit