This paper proposes new architectures for envelope-tracking power supplies for base stations. (1) The proposed multiphase DC-DC converter circuit uses multiple switching circuits with hysteresis comparators (as well as a voltage follower circuit), each optimized for a different envelope frequency, to realize both high efficiency and wide bandwidth. (2) We also propose the one using interleaved PWM switching circuits. The operation of the circuits, and simulation results, are described.
This paper discusses the design and characteristics of power combining and power dividingcombining by meam of traveling-wave power dividerlcombmers using waveguides. First, the perfect power combining condition is given when the divider/combiner is used as a single power combiner. From the numerical analysis based on the equivalent circuit, it is shown that a highly efficient power combining is possible over a very broad frequency range. It is shown also that the degradation of the combining efficiency with respect to the deviation of the input amplitudes and phases from the designed values is small.For a power dividing-combining system using two identical power dividedcombiners, it is shown that a broadband characteristic can be obtained, the bandwidth increases with a number of branches, and the performance degradation by failure of one of the devices in the unit amplifiers can be kept minimum by appropriate choices of the device location. Further, the four-and sixway power dividing-combining experiment has been carried out at X-band. The validity of the theory was confirmed. In the six-way power dividingcombining, a broadband characteristic was realized as evidenced by the bandwidth of 2.87 GHz with a combining efficiency of more than -0.5 dB and of 3.90 GHz with a return loss of l e~~ than -20 dB.Tatsuhiro Shimura graduated in 1993 from the Department of Electrical and Electronic Engineering, Okayama University, where he received his M.S. degree in 1995. In 1995, he joined Sumitomo Electric Industries. He w e engaged in research 011 microwave power divider/combiner.
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