System and method of altering a PWM carrier power spectrum

A circuit comprising:

• a plurality of superframe structures, each of the plurality of superframe structures including an input to receive a pulse width modulated (PWM) signal and including an output, each of the plurality of superframe structures configured to selectively apply a modulation operation to the PWM signal according to one of a plurality of superframe patterns to produce a superframed PWM signal;
• a switch including a plurality of inputs coupled to the outputs of the plurality of superframe structures, a control input, and a switch output;
• and
• a control circuit coupled to the control input and configured to control the switch to selectively provide the superframed PWM signal of one of the outputs of the plurality of superframe structures to the switch output as a modulated PWM signal.

A system comprising:

• a pulse edge controller comprising:
• a first input for receiving a pulse width modulated (PWM) signal;
• a second input for receiving a duty cycle complement of the PWM signal;
• a control input;
• a first output;
• a second output;
• and
• logic circuitry coupled to the control input and configurable to selectively apply a modulation operation to the PWM signal and the duty cycle complement of the PWM signal to produce modulated PWM output signals at the first and second outputs in response to a superframe pattern received at the control input;
• and
• a control circuit coupled to the control input and adapted to apply the superframe pattern selectively to the control input to control operation of the logic circuitry.