The Research On Key Power Supply Technology In CMOS Radio Frequency Integrated Circuits

With the development of electronic science and technology,mobile electronic devices have gain popularity with people in this regard.In recent years,with the wearable electronic industry continued to heat up,the electronic system has been developed toward miniaturization and integration.As a very basic building block of electronic system,power management unit has attracted plenty of attention.And also,with the increasing demand for the miniaturization of portable electronic devices,the on-chip power management technology has gradually become a research hotspot both at home and abroad.In this paper,a detailed and in-depth study of on-chip linear regulator has been developed,aiming at improving the loop stability and the transient performance of regulators.The introduction of several innovative circuit technologies to optimize the loop stability and the transient performance of linear regulators is also provided.These technologies are central to the achievement of a stable transient-enhanced on-chip linear regulator.To begin with,the basic working principle of linear regulator and several common topologies are introduced,followed with the performance comparison of these topologies.Then,according to the topology chosen in this paper,a brief analysis of the sub-modules used in this topology is provided,including the bandgap voltage reference,the error amplifier and the pass element.Several key specifications for linear regulator including the dropout voltage,power consumption,linear regulation,load regulation,noise and power supply ripple rejection are discussed in detail.This paper also analyzed the regulation loop stability and the transient performance of on-chip linear regulator,introduced several optimized circuit structures.At last,with the optimized circuit structures this paper mentioned,a low-dropout voltage regulator is designed and implemented in 65 nm CMOS technology.The measurement results show that the regulator this paper designed can achieve good loop stability and excellent transient performance in the range of any load condition.The input voltage of this regulator ranges from 2.0V to 3.0V,and the output is fixed at 1.8V.Under heavy load condition,the dropout voltage can be as small as 200 m V.The minimum load current requirement for this regulator is 100 uA,and the output voltage spike is less than 80 mV under the full load range step change.With the minimum load current,the ground current of this regulator can be smaller than 40 uA at room temperature.At the same time,the regulator also has excellent line regulation and load regulation,as well as superior low-frequency power supply ripple rejection ratio.