Highly efficient supply modulator for mobile communication systems

Supply modulator;DC-DC;Dithering;Random modulation

Kim, Eung Jung ; Electrical and Computer Engineering

University:Georgia Institute of Technology

Department:Electrical and Computer Engineering

关键词: Supply modulator;    DC-DC;    Dithering;    Random modulation;   

Others  :  https://smartech.gatech.edu/bitstream/1853/41058/1/kim_eungjung_201108_phd.pdf

美国|英语

来源: SMARTech Repository

【 摘 要 】

Switching frequency modulation techniques, an inductor current sensing circuit for fast switching converter, and a dual converter are proposed, and the simulation results and experimental results are drawn. The experimental results for monotonic and pseudo-random modulation techniques show that the switching noise peak was effectively reduced as much as -19 dBc. The inductor current sensing circuit accurately tracks the output current of the switching converter that switches up to 30MHz. This current sensing circuit is used to drive the slow converter in the dual converter. The dual converter consists ofa fast converter and a slow converter. The fast converter provides only the high frequency conponents in the output current, and the slow converter provides the majority portion of the output current with a higher efficiency. Therefore, the dual converter can have a fast transient response without sacrificing its efficiency. All chips are fabricated in a standard CMOS 0.18um process.