A 3 A sink/source G_m-driven CMOS low-dropout regulator（LDO）,specially designed for low input voltage and low cost,is presented by utilizing the structure of a current mirror G_m（transconductance）driving technique...A 3 A sink/source G_m-driven CMOS low-dropout regulator（LDO）,specially designed for low input voltage and low cost,is presented by utilizing the structure of a current mirror G_m（transconductance）driving technique,which provides high stability as well as a fast load transient response.The proposed LDO was fabricated by a 0.5μm standard CMOS process,and the die size is as small as 1.0 mm^2.The proposed LDO dissipates 220μA of quiescent current in no-load conditions and is able to deliver up to 3 A of load current.The measured results show that the output voltage can be resumed within 2μs with a less than 1mV overshoot and undershoot in the output current step from-1.8 to 1.8 A with a 0.1μs rising and falling time at three 10μF ceramic capacitors.展开更多
This paper presents a single-inductor-multiple-output(SIMO)buck/boost/buck-boost converter for wearable electronic devices.Aiming at high light-load efficiency and low ripple,the converter applies fully asynchronous b...This paper presents a single-inductor-multiple-output(SIMO)buck/boost/buck-boost converter for wearable electronic devices.Aiming at high light-load efficiency and low ripple,the converter applies fully asynchronous burst mode control.The circuit enters sleep mode intermittently during light loads,significantly reducing static power consumption.The peak inductor current is fixed,effectively limiting the maximum output ripple.The converter features three conversion modes:buck,boost,and auto-gain buck-boost.DC analysis is conducted to derive expressions for output ripple and maximum load in relation to the peak inductor current.AC stability analysis is performed with small signal perturbation and linearization methods,proving the stability of all three modes.Measured results indicate that the converter achieves a peak efficiency of 91.0%at an output power of 77.5 mW.The maximum output ripple is 27.0 mV,and the overshoot or undershoot during load transients is not observed.Compared with existing converters,it exhibits higher efficiency and lower ripple,along with a fast load transient response,offering a highly efficient power management solution for wearable devices.INDEX TERMS SIMO DC-DC converter,DCM-TM control,PFM,load transient response,stability.展开更多
This paper presents a 200 mA low-dropout （LDO） linear regulator using two modified techniques for frequency compensation. One technique is that the error amplifier uses a common source stage with variable load, whic...This paper presents a 200 mA low-dropout （LDO） linear regulator using two modified techniques for frequency compensation. One technique is that the error amplifier uses a common source stage with variable load, which is controlled by the output current, is served as the second stage for a stable frequency response. The other technique is that the LDO uses a pole-zero tracking compensation technique at the error amplifier to achieve a good frequency response. The proposed circuit was fabricated and tested in HJTC 0.18 μm CMOS technology. The designed LDO linear regulator works under the input voltage of 2.8-5 V and provides up to 200 mA load current for an output voltage of 1.8 V. The total error of the output voltage due to line and load variation is less than 0.015%. The LDO die area is 630 x 550 μm^2 and the quiescent current is 130 μA.展开更多
基金Project supported by the National Natural Science Foundation of China(No60876023)
文摘A 3 A sink/source G_m-driven CMOS low-dropout regulator（LDO）,specially designed for low input voltage and low cost,is presented by utilizing the structure of a current mirror G_m（transconductance）driving technique,which provides high stability as well as a fast load transient response.The proposed LDO was fabricated by a 0.5μm standard CMOS process,and the die size is as small as 1.0 mm^2.The proposed LDO dissipates 220μA of quiescent current in no-load conditions and is able to deliver up to 3 A of load current.The measured results show that the output voltage can be resumed within 2μs with a less than 1mV overshoot and undershoot in the output current step from-1.8 to 1.8 A with a 0.1μs rising and falling time at three 10μF ceramic capacitors.
基金supported in part by the National Natural Science Foundation of China under Grant 62434003Grant 92473109in part by Common Mode(GONGMO)Semiconductor Co.,Ltd.
文摘This paper presents a single-inductor-multiple-output(SIMO)buck/boost/buck-boost converter for wearable electronic devices.Aiming at high light-load efficiency and low ripple,the converter applies fully asynchronous burst mode control.The circuit enters sleep mode intermittently during light loads,significantly reducing static power consumption.The peak inductor current is fixed,effectively limiting the maximum output ripple.The converter features three conversion modes:buck,boost,and auto-gain buck-boost.DC analysis is conducted to derive expressions for output ripple and maximum load in relation to the peak inductor current.AC stability analysis is performed with small signal perturbation and linearization methods,proving the stability of all three modes.Measured results indicate that the converter achieves a peak efficiency of 91.0%at an output power of 77.5 mW.The maximum output ripple is 27.0 mV,and the overshoot or undershoot during load transients is not observed.Compared with existing converters,it exhibits higher efficiency and lower ripple,along with a fast load transient response,offering a highly efficient power management solution for wearable devices.INDEX TERMS SIMO DC-DC converter,DCM-TM control,PFM,load transient response,stability.
文摘This paper presents a 200 mA low-dropout （LDO） linear regulator using two modified techniques for frequency compensation. One technique is that the error amplifier uses a common source stage with variable load, which is controlled by the output current, is served as the second stage for a stable frequency response. The other technique is that the LDO uses a pole-zero tracking compensation technique at the error amplifier to achieve a good frequency response. The proposed circuit was fabricated and tested in HJTC 0.18 μm CMOS technology. The designed LDO linear regulator works under the input voltage of 2.8-5 V and provides up to 200 mA load current for an output voltage of 1.8 V. The total error of the output voltage due to line and load variation is less than 0.015%. The LDO die area is 630 x 550 μm^2 and the quiescent current is 130 μA.
