Patent ID: 7839126

Claim:
A signal converting apparatus comprising: a swing range converting unit configured to compare an error signal varying across a first swing range with a first reference voltage, and convert the error signal to an adjusted error signal varying across a second swing range in accordance with the comparison of the error signal and the first reference voltage; an oscillator configured to generate a periodic oscillation signal varying approximately across the second swing range; a comparator configured to receive and compare the adjusted error signal and the oscillation signal, and generate a pulse-width modulated signal in accordance with the comparison; a low pass filter having an input terminal and an output terminal; a switching unit configured to control the supply of a direct current (DC) power voltage to the input terminal of the low pass filter in response to the pulse-width modulated signal; a voltage divider connected between the output terminal of the low pass filter and ground and configured to provide a divided voltage output; an error amplifier configured to receive the divided voltage output and a second reference voltage, amplify a voltage difference between the divided voltage output and the second reference voltage, and generate the error signal; and a reference voltage generation unit configured to generate the first reference voltage and the second reference voltage, wherein the first swing range is greater than the second swing range, and the second swing range is defined between the first reference voltage and the second reference voltage.