An apparatus and method for generating a plurality of output signals that can be used for driving a corresponding plurality of charge pumps from a signal oscillating between a first and second logic state. The apparatus includes a plurality of shift register stages coupled in series, where the shift register stages shift a latched logic state in response to the oscillating signal. Further included in the apparatus is a duty cycle correcting circuit coupled to the output terminals of the shift register stages which generates each of the output signals that can be used to drive a charge pump based on the latched logic state of two of the shift register stages.
Duty cycle correcting circuits having a gain adjusting circuit that selects one of a plurality of gains of the duty cycle correcting circuit based on a frequency of an input signal. An output circuit outputs a duty cycle corrected output signal based on the input signal and the selected one of the plurality of gains. The input signal may be an input clock signal and the output signal may be a corrected clock signal. Methods are also provided.
