Fine tuning of switching frequency for minimal distortion high frequency PWM systems

Summary form only given, as follows. A new method for evaluating and minimizing in-band and out-of-band spurious intermodulation, in a naturally sampled PWM, is introduced and theorized. The proposed fine tuning method is based on solution of a set of linear inequalities, which are a function of RF and switching frequencies. The equations can be solved through linear programming techniques. A prototype class-D amplifier has been designed, realized and tested in 65 nm CMOS, which verifies the theoretical findings.