RF power amplifier RFPA function The RF power amplifier RFPA is the main part of the transmission system, and its importance is self-evident. In the pre-stage circuit of the transmitter, the RF signal generated by the modulating oscillating circuit has a small power, and needs to pass through a series of amplification-buffering stage, intermediate amplification stage, and final stage power amplification stage, and after obtaining sufficient RF power, it can feed. Radiate out onto the antenna. In order to obtain a sufficiently large RF output power, an RF power amplifier must be used. Power amplifiers are often the most expensive, power-hungry, and least efficient devices in a fixed device or terminal. After the modulator generates the RF signal, the RF modulated signal is amplified by the RFPA to a sufficient power, which is transmitted through the matching network and then transmitted by the antenna. The function of the amplifier is to amplify and output the input. The content of the input and output, which we call "signal", is often expressed as voltage or power. For a "system" such as an amplifier, its "contribution" is to raise a certain level of what it "absorbs" and "output" it to the outside world. This "increasing contribution" is the "meaning" of the existence of the amplifier. If the amplifier can have good performance, then it can contribute more, which reflects its own "value." If there is a certain problem with the initial "mechanism design" of the amplifier, then after starting work or working for a period of time, not only can no "contribution" be provided, but there may be some unexpected "shocks". Shocking, for the outside world or the amplifier itself, is catastrophic. Classification of RF Power Amplifier RFPA The power amplifiers are classified as follows depending on the operating conditions: RF power amplifiers have a high operating frequency, but the relative frequency band is narrow. RF power amplifiers generally use a frequency selective network as the load loop. The RF power amplifier can be divided into three working states: A (A), B (B), and C (C) according to different current conduction angles. The conduction current of the Class A amplifier current is 360°, which is suitable for small signal low power amplification. The conduction angle of the Class B amplifier current is equal to 180°, and the conduction angle of the Class C amplifier current is less than 180°. Both Class B and Class C are suitable for high-power operation. The output power and efficiency of Class C operating states are the highest among the three operating states. RF power amplifiers mostly work in Class C, but the current waveform distortion of Class C amplifiers is too large and can only be used to use a tuning loop as a load resonant power amplifier. Since the tuning loop has filtering capability, the loop current and voltage are still close to a sinusoidal waveform with little distortion. In addition to the above-mentioned operating states classified according to the current conduction angle, there are D (D) amplifiers and E (E) amplifiers that operate the electronic device in a switching state, and the efficiency of the D-type amplifier is higher than that of the C-type amplifier. The motor wire also apply to automotive, bus, bike, truck. Yacenter have 19 years experience in wire harness industry, cooperate with Nisson, BMW, GM, HONDA, Mitsubishi
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