In a Class-D amplifier design an accurate triangle wave signal is required to
achieve the pulse width signals. The generation of the triangle wave can be done
with the use of simple circuits which consist of a square wave generator and an
integrator which integrates the square wave to a triangle wave. Most of these
circuits consist of comparators and op-amps that can handle the required frequency
and not exceed their respective slew rates. More in-depth explanation on the
chosen circuit for the triangle wave generator is in the design part of the report. The
frequency of the triangle wave must be at least three times the switching frequency.
Having the triangle wave frequency at least two or three times greater will minimize
distortion from harmonics [3]. The output filters cutoff frequency plays an important
role in choosing the triangle wave frequency due to harmonic distortion that is
generated from the switching of the amplifier.
b) Pulse