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Analog Amplifiers There Are The Following Shortcomings

Analog Amplifiers There are the following shortcomings

I global audio and video digital wave and people on the audio and video energy saving and environmental protection requirements, forcing people to research and development as soon as possible efficient, energy saving, digital audio power amplifier. Traditional audio power amplifier work, directly on the analog signal amplification, the work must work in the linear amplification zone, power dissipation is large, although the use of push-pull output, reducing the power device to withstand the power, but in the larger power In the case of power devices still constitute a great threat, power output is limited. In addition, the analog power amplifier also has the following shortcomings: ⒈ circuit is complex, high cost. Often need to design complex compensation circuit and over-current, over-voltage, overheating and other protection circuits, larger, complex circuit. ⒉ low efficiency, the output power can not do a lot. D-type switching audio power amplifier is based on the PWM mode: the audio signal and sampling frequency comparison, after natural sampling, the pulse width and audio signal amplitude is proportional to the proportion of changes in the PWM wave, and then through the drive circuit, added to the power MOS gate , Control the power device switch, to achieve amplification, the amplified PWM signal into the filter, then restore the audio signal. Class D power amplifier work in the switch state, the theoretical efficiency of up to 100%, the actual use of up to 80% or more. For high-inductance loudspeakers, the design of the circuit, you can save the low-pass filter (LPF), which can greatly save the volume and cost. And have a higher degree of fidelity, which, in the foreign 5V Class D audio power amplifier has been used, such as: TEXAS company TPA2002D2. In recent years, the international stepped up on the Class D audio power amplifier research and development, and made some progress, several well-known research institutions and companies have experimentally provided to the market Class D audio power amplifier evaluation module and technology. This technology immediately after the advent of its efficient, energy saving, digital significant features, caused by scientific research, teaching, electronics industry, the business community of particular concern. In the near future, Class D audio power amplifiers will replace traditional analog audio power amplifiers. The global wave of digital audio and video and the people of audio and video energy saving and environmental protection requirements, forcing people to study and develop as soon as possible efficient, energy saving, digital audio power amplifier. It should have the high efficiency, easy to connect with other digital devices.

Audio power amplifier is a technology has been quite mature areas, for decades, people have made unremitting efforts, both from the line technology or components, and even the ideological understanding have made considerable progress. Looking back on the development of power amplifiers, it may be a fun thing for our broadcasters. 1.2.1 Early Transistor Amplifier The advancement of semiconductor technology has made the transistor amplifier a big step forward. Since the transistor, people began to use it to create power amplifier.