The overload capacity of digital power amplifier circuit is much higher than that of analog power amplifier. Analog power amplifier circuits are divided into Class A, Class B or Class AB power amplifier circuits, and the power amplifier tube works in the linear region during normal operation; After overload, the power amplifier tube works in the saturation region, resulting in harmonic distortion, doubled distortion and rapid deterioration of sound quality. However, digital power amplifier is always in saturation region and cutoff region during power amplification. As long as the power amplifier tube is not damaged, the distortion will not increase rapidly.
2. Overload distortion is different.
Because the digital power amplifier adopts switching amplifier circuit, the efficiency is extremely high, which can reach 75%~90% (the efficiency of analog power amplifier is only 30%~50%), and it basically does not generate heat when working. Therefore, it has no static current consumption of analog power amplifier, almost all the energy is reserved for audio output, and there is no analog amplification and negative feedback before and after, so it has better "dynamic" characteristics, good transient response and strong "explosive feeling".
Extended data:
The main advantage of analog signal is its accurate resolution. Ideally, it has infinite resolution. Compared with digital signals, analog signals have higher information density. Because there is no quantization error, the real value of natural physical quantity can be described as close as possible. Another advantage of analog signal is that when the same effect is achieved, analog signal processing is simpler than digital signal processing. Analog signal processing can be directly realized by analog circuit components (such as operational amplifiers), while digital signal processing often involves complex algorithms and even requires special digital signal processors.
It is easier to understand that digital signals are converted into analog signals. In fact, digital-to-analog conversion can be regarded as decoding digital signals. Digital-to-analog conversion is to convert the input binary numbers into corresponding analog quantities according to their actual weights, and then add the corresponding analog quantities of each number, and the total analog quantity obtained is proportional to the input digital quantity, thus realizing the conversion from digital signals to analog signals.