Abstract: A method includes generating a gain transition signal in response to any one of an average value of a feedback signal, a slope of the feedback signal, a slope of an input signal of the power converter, a maximum value of the input signal, and a minimum value of the input signal, and generating a first gain control signal and a second gain control signal in response to the gain transition signal. A gain transition controller includes a transition signal generator generating the gain transition signal and a gain control signal generator generating the first gain control signal and the second gain control signal in response to the gain transition signal.

Abstract: A method includes generating a gain transition signal in response to any one of an average value of a feedback signal, a slope of the feedback signal, a slope of an input signal of the power converter, a maximum value of the input signal, and a minimum value of the input signal, and generating a first gain control signal and a second gain control signal in response to the gain transition signal. A gain transition controller includes a transition signal generator generating the gain transition signal and a gain control signal generator generating the first gain control signal and the second gain control signal in response to the gain transition signal.

Abstract: A method includes generating a first gain control signal and a second gain control signal in response to a gain transition signal indicating a transition of a power converter from a first gain mode to a second gain mode. The method further includes causing the power converter to enter the first gain mode in response to the first gain control signal, and causing the power converter to enter the second gain mode in response to the second gain control signal. A circuit includes a gain transition controller generating a first gain control signal and a second gain control signal in response to a gain transition signal, and a gain control circuit causing the power converter to enter the first gain mode in response to the first gain control signal and causing the power converter to enter the second gain mode in response to the second gain control signal.

Abstract: A method includes generating a first gain control signal and a second gain control signal in response to a gain transition signal indicating a transition of a power converter from a first gain mode to a second gain mode. The method further includes causing the power converter to enter the first gain mode in response to the first gain control signal, and causing the power converter to enter the second gain mode in response to the second gain control signal. A circuit includes a gain transition controller generating a first gain control signal and a second gain control signal in response to a gain transition signal, and a gain control circuit causing the power converter to enter the first gain mode in response to the first gain control signal and causing the power converter to enter the second gain mode in response to the second gain control signal.

Abstract: An exemplary embodiment of the present invention generates a plurality of clock signals having a frequency according to an output voltage, a plurality of low clock signals of which frequencies are half of frequencies of the plurality of clock signals, and a phase signal corresponding to the output voltage by subtracting an average phase error from a count signal sampled by being synchronized with a reference clock signal from the count result of a first clock signal having the earliest phase among the plurality of clock signals. The average phase error is generated according to a comparison result of a first low clock signal corresponding to the first clock signal and each of other low clock signals among the plurality of low clock signals by being synchronized with the reference clock signal.

Abstract: An equalizer, group delay compensation circuit for the equalizer and method of compensating for group delay may improve group delay characteristics in the equalizer. The equalizer circuit may include a first low pass filter configured to filter a received input signal to output a filtered input signal, and a gain control circuit connected to an output terminal of the first low pass filter, and configured to modulate a gain of a transfer function for the equalizer. The equalizer may include a group delay compensation circuit connected to the output terminal of the first low pass filter and configured to compensate for a group delay of the input signal, and a second low pass filter connected to the output terminal of the first low pass filter.

Abstract: A wobble signal for an optical storage device is generated by adjusting a center frequency (?0) of a band pass filter based on an expected frequency of the wobble signal and/or an estimated position of a pick-up apparatus and filtering an input signal corresponding to the wobble signal from the pick-up apparatus with the adjusted band pass filter to provide the wobble signal. Adjusting the center frequency (?0) of the band pass filter may also be based on a measured phase change of the band pass filter. Systems for generating a wobble signal, wobble signal detection circuits and optical storage devices are also provided.

Abstract: A wobble signal for an optical storage device is generated by adjusting a center frequency (?0) of a band pass filter based on an expected frequency of the wobble signal and/or an estimated position of a pick-up apparatus and filtering an input signal corresponding to the wobble signal from the pick-up apparatus with the adjusted band pass filter to provide the wobble signal. Adjusting the center frequency (?0) of the band pass filter may also be based on a measured phase change of the band pass filter. Systems for generating a wobble signal, wobble signal detection circuits and optical storage devices are also provided.

Abstract: An equalizer, group delay compensation circuit for the equalizer and method of compensating for group delay may improve group delay characteristics in the equalizer. The equalizer circuit may include a first low pass filter configured to filter a received input signal to output a filtered input signal, and a gain control circuit connected to an output terminal of the first low pass filter, and configured to modulate a gain of a transfer function for the equalizer. The equalizer may include a group delay compensation circuit connected to the output terminal of the first low pass filter and configured to compensate for a group delay of the input signal, and a second low pass filter connected to the output terminal of the first low pass filter.

Abstract: A DC offset compensation circuit, and method thereof are capable of reducing the settling time of an output signal through fast compensation of a DC offset of the output signal although a DC voltage of an input signal varies in a closed loop operational amplifier. The DC offset compensation circuit of a closed loop operational amplifier includes a first closed loop operational amplifier and a second closed loop operational amplifier. The first closed loop operational amplifier amplifies an input signal based on a compensation voltage. The second closed loop operational amplifier amplifies a signal output from the first closed loop operational amplifier based on a reference voltage to generate a final output signal.

Abstract: A DC offset compensation circuit, and method thereof are capable of reducing the settling time of an output signal through fast compensation of a DC offset of the output signal although a DC voltage of an input signal varies in a closed loop operational amplifier. The DC offset compensation circuit of a closed loop operational amplifier includes a first closed loop operational amplifier and a second closed loop operational amplifier. The first closed loop operational amplifier amplifies an input signal based on a compensation voltage. The second closed loop operational amplifier amplifies a signal output from the first closed loop operational amplifier based on a reference voltage to generate a final output signal.