RF power amplifiers (RF PAs) are an important part of a variety of wireless transmitters. 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.
RF power amplifiers are an important part of the transmitting device. The main technical indicators of RF power amplifiers are output power and efficiency. In addition to this, the harmonic components in the output should be as small as possible to avoid interference with other channels.
RF power amplifiers are electronic circuits that take into account issues such as output power, excitation levels, power consumption, distortion, efficiency, size, and weight. In a transmitting system, the output power of the RF power amplifier can range from as small as mW to as large as several kW, but this refers to the output power of the final stage power amplifier. In order to achieve high power output, the final stage must have a sufficiently high excitation power level.
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. Most of the RF power amplifiers work in Class C, but the current waveform distortion of Class C amplifiers is too large and can only be used to use the tuning loop as the load resonance power amplification. 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.
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