Different Professional Amplifiers

Class D (digital audio power) Professional Amplifiers are a kind of input analog audio signal or PCM digital information converted into PWM (pulse width modulation) or PDM (pulse density modulation) pulse signal, and then controlled by PWM or PDM pulse signal High-power switching device on/off audio power amplifiers, also known as switching amplifiers.

Here is the content list:

• Class D Professional Amplifiers

• Advantages of Class D Professional Amplifiers

• The other two Professional Amplifiers

Class D Professional Amplifiers

Class D Professional Amplifiers have the outstanding advantage of high efficiency. The digital audio power amplifier also looks like a one-bit power digital-to-analog converter. The amplifier consists of an input signal processing circuit, a switching signal forming circuit, a high-power switching circuit (half-bridge and full-bridge) and a low-pass filter ( LC), and other four parts. It uses a very high-frequency switch circuit to amplify the audio signal.

Advantages of Class D Professional Amplifiers

1. It has a high efficiency, which can usually reach more than 85%;

2. The volume is small, which can save a lot of space compared with the analog amplifier circuit;

3. No crack noise connection;

4. Low distortion, good frequency response curve. There are few peripheral components, which is convenient for design and debugging.

Class A, B, and AB amplifiers are analog amplifiers, and Class D amplifiers are digital amplifiers. Class B and Class AB push-pull amplifiers have higher efficiency and less distortion than Class A amplifiers, and the power amplifier transistors consume less power and have better heat dissipation. However, the class B amplifier will produce alternating distortion due to poor switching characteristics or improper selection of circuit parameters during the transition process of the transistor on and off. The class D amplifier has high efficiency and low distortion, and the frequency response curve is good. Advantages of fewer peripheral components. Class AB amplifiers and class D amplifiers are the basic circuit forms of audio power amplifiers.

The other two Professional Amplifiers

Class AB amplifier:

The main characteristics of the class AB amplifier are: the conduction time of the transistor is slightly longer than half a cycle, and two push-pull tubes must be used to work. Crossover distortion can be avoided. Alternating distortion is large and can cancel even harmonic distortion. The efficiency is high, and the power consumption of the transistor is small.

Class C amplifier:

The main characteristic of Class C amplifiers is that the transistors are only active for a short period of each cycle of the input signal. When the circuit is working, a negative bias voltage is usually provided to the amplifier tube to ensure that the transistor will not work in a Class B state. Its collector load is not a resistor but an LC parallel resonant circuit, so the class C amplifier is also called a resonant amplifier circuit. The frequency selection function is achieved by adjusting the capacitance of the capacitor or the inductance of the inductor. The conversion efficiency of Class C Professional Amplifiers is extremely high, which can reach 98%. But because the load is a resonant circuit, the circuit often works in a high-frequency state, so the distortion is large, so Class C Professional Amplifiers are not suitable for audio power amplifiers. Instead, it is widely used in the radio community because of its selectable frequency characteristics, so it is usually used as an RF amplifier, tuning amplifier, and frequency multiplier.

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