Floating power rail generation circuit and generation method

The embodiment of the invention provides a floating power rail generation circuit and method, and the circuit comprises a bias circuit which is used for generating a bias current according to an external reference current, and determining a reference voltage in combination with a power supply, so as to provide the reference voltage to a first input end of a high-voltage amplifier; the high-voltage amplifier is used for generating a voltage amplification signal according to the bias voltage; the high-speed adjusting circuit is used for outputting the output end voltage of the floating power rail generating circuit according to the voltage amplification signal; the voltage division feedback circuit is used for performing voltage division processing on the acquired output end voltage to generate feedback voltage and feeding back the feedback voltage to the second input end of the high-voltage amplifier; the high-speed adjusting circuit is further used for self-adjusting the voltage of the output end so that the