Based on UMC55nm process,this paper designs a LDO low voltage difference linear regulator which can be used in SoC.Since Capless LDO does not have μ F capacitance at the output,loop stability and transient response are affected.Based on these two points,current differentiator and capacitance multiplier technology are proposed to improve the stability and transient response of the loop.Finally,the feasibility of the design is verified by Cadence Spectre simulation.The simulation results show that the designed LDO can output 1.1V stably under the power supply voltage of 1.2V.Under the condition of switching light and heavy load,the circuit output overshoot voltage is 24.2mV,undershoot voltage is 21 mV,and recovery time are less than 3μs.
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