Abstract: A booster is composed of a switching circuit outputting a clock signal and a charge pumping circuit boosting an input voltage to generate an output voltage in response to the clock signal. The switching circuit selects one from among frequencies as a frequency of the clock signal in response to the output voltage.

Abstract: A multi-phase clock generator for receiving an external clock signal through a PLL and for generating a plurality of internal clock signals differing in phase from each other. The multi-phase clock generator includes two large gates whose outputs are the two internal clock signals, and two latch circuits for controlling the logic gate outputs. The output from the PLL is fed forward to the logic gates so that the rise of one internal clock signal is separated from a prior fall of the other internal clock signal by a period related to the frequency of the PLL output.