Patent ID: 6861830

Claim:
A method of improving transient noise of a switching DC-to-DC converter including a plurality of power supply channels connected in parallel between a DC voltage source and ground for converting the DC voltage source into a plurality of DC output voltages which are separate from each other, the method comprising: generating a first oscillating signal having a first period, in which during each period of the first period the first oscillating signal presents a peak, a valley, a rising portion gradually increasing from the valley toward the peak, and a falling portion gradually decreasing from the peak toward the valley; inputting the first oscillating signal to a first power supply channel of the plurality of power supply channels such that at least one switching transition of the first power supply channel occurs during one selected from a group consisting of the rising portion and the falling portion; generating a second oscillating signal having a second period, in which during each period of the second period the second oscillating signal presents an instantly transiting edge which simultaneously occurs with one selected from a group consisting of the peak and the valley; and inputting the second oscillating signal to a second power supply channel of the plurality of power supply channels such that at least one switching transition of the second power supply channel simultaneously occurs with the instantly transiting edge, whereby: the at least one switching transition of the first power supply channel occurs separately in a time domain from the at least one switching transition of the second power supply channel.