Abstract: A new frequency compensation technique for low-power,area-efficient multistage amplifiers is introduced.Using nested active capacitors,our scheme achieves better bandwidth-to-power and slew-rate-to-power performances than previous works.Implemented in standard 0.35μm CMOS technology,our three-stage amplifier achieves 105dB DC gain,3.3M GBW,68° phase margin,and 2.56V/μs average slew rate under a 150pF capacitive load.All of these are realized with only 40μW power consumption under a 2V power supply,with very small compensation capacitors.

Key words: multistage amplifier, frequency compensation, low power