This paper describes a LDO with low 1/f noise and wide bandwidth. With the help of chopping technology, the achievable output noise of LDO is 139nv/√Hz at 10Hz, 64.7nv/√Hz at 100Hz, and 36.3nv/√Hz at 1kHz under the worst corner. Since the 1/f noise corner is as low as Hertz level, it can be used to power the modules whose signal bandwidth is Hertz level. The LDO proposed in this paper also adds the current fast compensation mechanism (CFA) and the fast compensation current mechanism at the load end of the output regulator, which can not only achieve a very high SNR, but also improve the power supply suppression energy and fast power supply capacity. The CFA also splits the low frequency pole between the amplifier and the PMOS regulator into two higher frequency poles, which extends the LDO bandwidth and achieves a higher PSRR.