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当今的数字式蜂窝电话生产厂家的竞争具体表现在三个方面：价格、尺寸及电池寿命。这三个因素均受到电话所用元件选择的影响，尤其是输出放大器。电池输出的直流电能被转变为射频能，用于声音传输，其效率对于电池消耗和由放大器产生且必须散发掉的热量极为重要。功率放大器的?
The competition for today’s digital cellular phone manufacturers is manifested in three specific areas: price, size and battery life. All three factors are affected by the choice of components used on the phone, especially the output amplifier. The DC power from the battery is converted to RF energy for sound transmission, whose efficiency is crucial to battery drain and heat generated by the amplifier and must be dissipated. Power amplifier?