A rail-to-rail 1-volt CMOS opamp

A rail-to-rail 1-volt only, full-CMOS opamp is presented. The opamp has a complementary PMOS/bulk-driven input stage and a class AB output stage, which provide both input and output rail-to-rail operation. HSPICE simulations are performed using BSIM 3.3 models of a 0.8 /spl mu/m CMOS process. This opamp has a DC gain of 45.1 dB, unity-gain bandwidth of 1.7 MHz and phase margin of 63.4.