METHODS AND APPARATUS FOR A DIRECT CURRENT -DIRECT CURRENT CONVERTER COMPATIBLE WITH WIDE RANGE SYSTEM CLOCK FREQUENCY

A direct current (DC) to DC (DC-DC) converter includes a comparator setting a pulse width of a signal pulse, the pulse width corresponding to a voltage level of an output voltage of the DC-DC converter; a digital delay line (DDL) operatively coupled to the comparator, the DDL adjusting the pulse width of the signal pulse by linearly introducing delays to the signal pulse; a multiplexer operatively coupled to the DDL, the multiplexer selectively outputting a delayed version of the signal pulse; a phase detector operatively coupled to a system clock and the multiplexer, the phase detector generating a phase error between an output of the multiplexer and the system clock; and a logic control circuit operatively coupled to the multiplexer and the DDL, the logic control circuit adjusting the delay introduced to the signal pulse in accordance with the phase error.