Abstract
A charge pump internal power supply generation circuit for rail-to-rail operational amplifier is proposed, which combines a non-overlapping clock signal and a time-interleaved boost charge pump to achieve an internal power supply which is higher than the power supply voltage. A voltage follower is used to avoid glitch during time-interleaving switching. The charge pump internal power supply circuit is realized by 0.5μm CMOS process. The simulation results show that the internal power supply circuit of the charge pump can generate an internal power supply signal which is 1.8V higher than the power supply voltage. After applying this internal power supply to the PMOS input folded cascode operational amplifier, the operational amplifier achieves the rail-to-rail input, and the unity gain bandwidth and phase margin are stable.
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