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High Power Audio Amplifier

    In recent years, the audio amplifier device quietly came to the Hi-Fi field. Some people call it the revolution of the audio amplifier, hoping to give a few stagnant sound industry to bring vitality. The so-called "digital amplifier" should be to let the audio signal in the form of pure digital from the beginning of the input to the speaker before the release of the last level. The basic circuit is the Class D amplifier. Class D amplifier Class D amplifier is actually a switching amplifier, the switching frequency up to 100kHz or more. The input is a digital audio signal input directly from a digital signal source such as a CD player, a DVD player, a DVD Audio or an SACD disc drive, and a DTV digital TV, rather than a music analog signal processed by ADC analog-to-digital conversion or DAC digital-to-analog conversion The
    The typical implementation process is as follows: first by the oscillator modulation DC power to produce a reference square wave signal, the operating frequency can follow the input signal changes, set to tens to hundreds of kilohertz; pulse width with the input signal size Variety. It is also possible to set up a sawtooth signal generator with a frequency that is doubling the reference square wave signal and synchronizing it. The sawtooth signal is used to compare the input signal that needs to be amplified and constantly changing. When the sawtooth wave differs from the input signal, a phase shift signal coincides with its instantaneous amplitude. And then outputs a polarity-selected pulse width modulation signal (PWM signal) by a switch circuit which is logically controlled by the reference signal and the phase shift signal. PWM signal through the transistor amplification and high-speed rectification, and then through the low-pass filter filter high-frequency components, smooth processing to return to the audio signal feed speaker playback.
   The biggest advantage of this circuit is the power consumption is minimal. Because it is usually resistant to secondary breakdown, switching efficiency is extremely high field effect transistor, running almost no loss, the efficiency of up to 90% (ordinary Class A or Class AB amplifier efficiency is only 50%). Efficient means low power consumption, low heat requirements, resulting in mass production of integrated circuits. Another advantage is that the distortion is small. We all know that in order to increase the frequency response width and prevent signal saturation distortion, almost all amplifiers need to use the feedback circuit, but the feedback generated by the delay effect is the original sound reproduction distortion.
    As the audio amplifier conversion time is very fast, the delay effect is negligible, the error is only one-sixth of the traditional analog amplifier, so the output control better, especially the transient response is more accurate and true, especially for explosive requirements High bass amplifier. It should be noted that the early digital amplifier still use analog circuits to deal with digital signals, although the efficiency is improved, but the high fidelity effect is poor and radio frequency interference. The real digital amplifier should use digital logic circuit, with advanced digital processing technology to compensate for high-speed transistor conduction, caused by the distortion. Class-T amplifiers Some companies have avoided this name in order to be different from the earlier Class D amplifiers.

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