In the modern popularization of sound,People's level of living, cultural practices, music, accomplishment and appreciate the different tastes,On the same electrical specifications of the audio equipment arrive at different evaluations。So, high-efficiency audio power amplifier, it should be listening to electrical targets and actual indicators of balance and unity。
Audio amplifier has a history of about a century,Audio amplifier has a history of about a century。However, until now,It is continuously updated,Development, and advance。Mainly because the human auditory sense of the importance of various kind of,Is also the most basic kind of 。In order to meet its needs ,The audio amplifier must be improved continuously 。
Into the 21st century ,A variety of portable electronic equipment, electronic devices has become an important trend 。From the cell phone as a communications tool ,To the device as a MP3 music player ,Has become available in almost all portable electronic devices 。There will be one after another popular portable TV,Portable DVD , etc 。All of these portable electronic devices, a common denominator is that all audio output ,That is, needs to have an audio amplifier ;Another feature is that they are battery-powered ,All wish to have a longer life 。It is in this context of demand ,Class D amplifiers have been developed out of,Its greatest feature is that it can maintain a minimum of distortion case of the highest efficiency 。
High-frequency amplifier audio power amplifier is an important component of the device 。Its main task is to enlarge high-frequency signals to reach the sufficient power ,In order to meet the needs of the antenna radiation or technical requirements 。
The main technical indicators of high-frequency power amplifier with output power of ,efficiency ,power gain ,Bandwidth and harmonic suppression, etc. 。As the transmitter output power and efficiency depends primarily on high-frequency power amplifier ,For the same transmitter,Efficiency means that the output power increases , constant, increased efficiency to reduce power consumption of the power ,Tubes to reduce power dissipation 。This is to save energy, the use of smaller power transistor output of large power ,Did not reduce the size and weight are prepared by considerable practical significance ,Therefore, improving the efficiency of power amplifiers has always been an important subject of attention, it promoted the continuous development of power amplifier technology 。
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