D-klasa radi na taj nacin sto je celokupni signal cifrovan. T.J, ili ga ima ili ga nema. Dakle prilicno digitalni rad ako mene neko pita. E sad nema tu klasicne konverzije signala ad/da. Princip je prilicno slican digitalnom ali je u sustini pulsni signal a ne digitalni u pravom smislu reci.
Evo i objasnjenja ko razume engleski.
A class-D amplifier or switching amplifier is an electronic amplifier where all power devices (usually MOSFETs) are operated as binary switches. They are either fully on or fully off. Ideally, zero time is spent transitioning between those two states.
Output stages such as those used in pulse generators are examples of class D amplifiers. However, the term mostly applies to power amplifiers intended to reproduce signals with a bandwidth well below the switching frequency.
The term "class D" is sometimes misunderstood as meaning a "digital" amplifier. While some class D amps may indeed be controlled by digital circuits or include digital signal processing devices, the power stage deals with voltage and current as a function of time. The smallest amount of noise, timing uncertainty, voltage ripple or any other non-ideality immediately results in an irreversible change of the output signal. The same errors will only lead to incorrect results when they become so large that a signal representing a digit is distorted beyond recognition. Up to that point, non-idealities have no impact on the transmitted signal. The difference between digital and analogue signals is that digital signals are subsequently interpreted as numbers whereas in analogue signals the exact waveform matters.[
|