hence the rectangular wave output signal of the comparator cmp causes the block minp to drive the upper driver udrv the and lower driver ldrv to turn on off the transistors m 2 and m 1 respectively as a result of the switching action of the transistors m 1 and m 2 a rectangular wave is generated at the node x that is an amplified version of the rectangular wave generated at the output of the comparator cmp in an embodiment if the supply voltage vcc is at 22 volts the rectangular wave at the node x transitions between 22 volts and 0 volts e g the rectangular wave u201c bangs u201d between 22 volts and 0 volts next the rectangular wave at the node x is filtered by the inductor ls the capacitor cs and the resistor rs more specifically because the current through the inductor ls and the voltage across the capacitor cs do not change instantaneously these components at the load 13 provide a filter that u201c smooths u201d the rectangular wave coming from the node x as a result an analog output signal is provided to the loudspeaker 12 that is an inverted amplified version of the input signal if an inverting configuration such as that shown in fig1 is used the analog output signal is not inverted e g is in phase if the non inverting configuration such as that shown in fig2 is used the above described operation of the system 10 can be thought of as an u201c analog adaptive modulation u201d aam implementation of a class d power amplifier aam allows implementation of a simple signal processing block on the same.