A signal conditioning circuit, comprising: a segmented voltage threshold circuit, comprising X segmented voltage threshold sub-circuits, wherein the X segmented voltage threshold sub-circuits is configured to output X voltage threshold signals, and the X voltage threshold signals have different threshold values, and X is an integer greater than or equal to 1; a selection circuit, connected to the segmented voltage threshold circuit and configured to receive an input voltage signal and the X voltage threshold signals and output X+1 conduction signals, wherein each conduction signal of the X+1 conduction signals is output based on a comparison result between the input voltage signal and one of the X voltage threshold signals; and a segmented voltage conditioning circuit, comprising X+1 segmented voltage conditioning sub-circuits, wherein each of the X+1 segmented voltage conditioning sub-circuit is configured to condition the input voltage signal to output a corresponding output voltage signal based on a corresponding conduction signal of the X +1 conduction signals; wherein the segmented voltage conditioning circuit comprises a switching transistor and a proportional operational amplifier sub-circuit, the proportional operational amplifier sub-circuit is configured to amplify the input voltage signal in a preset proportion, wherein a gate of the switching transistor is connected to the selection circuit, a source of the switching transistor is connected to an input terminal of the proportional operational amplifier sub-circuit, and an output terminal of the proportional operational amplifier sub-circuit is configured to output a proportional amplified voltage signal. a segmented voltage threshold circuit, comprising X segmented voltage threshold sub-circuits, wherein the X segmented voltage threshold sub-circuits is configured to output X voltage threshold signals, and the X voltage threshold signals have different threshold values, and X is an integer greater than or equal to 1; a selection circuit, connected to the segmented voltage threshold circuit and configured to receive an input voltage signal and the X voltage threshold signals and output X+1 conduction signals, wherein each conduction signal of the X+1 conduction signals is output based on a comparison result between the input voltage signal and one of the X voltage threshold signals; and a segmented voltage conditioning circuit, comprising X+1 segmented voltage conditioning sub-circuits, wherein each of the X+1 segmented voltage conditioning sub-circuit is configured to condition the input voltage signal to output a corresponding output voltage signal based on a corresponding conduction signal of the X +1 conduction signals; wherein the segmented voltage conditioning circuit comprises a switching transistor and a proportional operational amplifier sub-circuit, the proportional operational amplifier sub-circuit is configured to amplify the input voltage signal in a preset proportion, wherein a gate of the switching transistor is connected to the selection circuit, a source of the switching transistor is connected to an input terminal of the proportional operational amplifier sub-circuit, and an output terminal of the proportional operational amplifier sub-circuit is configured to output a proportional amplified voltage signal.