System and method for controlling variations of switching frequency

A system for providing a pseudorandom signal, the system comprising:

• a shift register configured to receive a first input signal and a second input signal and generate a digital signal, the shift register including m flip-flops, m being a positive integer;
• a processing device configured to receive a plurality of signals and generate the first input signal, the plurality of signals representing data stored in a plurality of flip-flops respectively, the plurality of flip-flops being selected from the m flip-flops;
• a digital-to-analog converter configured to receive the digital signal and generate an analog signal associated with a signal strength;
• wherein:
• the digital signal represents at least an N-bit datum, N being a positive integer;
• the N-bit datum corresponds to N flip-flops, the N flip-flops being selected from the m flip-flops.

A method for providing frequency control to a power converter, the method comprising:

• generating a digital signal, the digital signal associated with at least an N-bit datum, N being a positive integer;
• receiving the digital signal;
• processing information associated with the digital signal;
• generating a first control signal based on at least information associated with the digital signal, the first control signal being an analog signal;
• receiving the first control signal;
• processing information associated with the first control signal;
• generating at least a first output signal related to a frequency based on at least information associated with the first control signal;
• wherein the N-bit datum represents a pseudorandom number.

A method for providing a pseudorandom signal, the method comprising:

• receiving a plurality of signals from a shift register;
• processing information associated with the plurality of signals;
• generating a first input signal based on at least information associated with the plurality of signals;
• receiving the first input signal and a second input signal by the shift register;
• processing information associated with the first input signal and the second input signal;
• generating a digital signal based on at least information associated with the first input signal and the second input signal by an M-sequence process;
• processing information associated with the digital signal;
• generating an analog signal related to a signal strength based on at least information associated with the digital signal;
• wherein:
• the digital signal represents at least an N-bit datum, N being a positive integer;
• the N-bit datum represents a pseudorandom number.