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.

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