Something You Need to Know About Power Amplifier

Strictly speaking, the power index of the power amplifier is divided into the nominal output power and the maximum instantaneous output power. The former is the rated output power, which can be interpreted as the maximum output power when the harmonic distortion changes within the standard range and can work safely for a long time. The latter refers to the "peak" output power of the power amplifier, which is interpreted as the maximum output power that the power amplifier can withstand instantaneously under the premise of ensuring that the signal is not damaged when the power amplifier accepts an electrical signal input.

Here is the content list:

• Resonant and Broadband Power Amplifiers

• Some other techniques

Resonant and Broadband Power Amplifiers

The resonant power amplifier uses the resonant circuit as the load of the active device and is an amplifier that amplifies narrow-band signals. This power amplifier allows the current waveform to be greatly distorted and then uses the resonant tank to filter out the harmonics. Active devices can be operated in Class C for high efficiency. It is mostly used in the final stage of high-power transmitters. If the resonant circuit is tuned to the harmonic of the input signal and an appropriate operating point is selected, a frequency multiplier can be formed.

Broadband power amplifiers use transmission line transformers as loads for active devices. The upper limit frequency of this power amplifier can reach hundreds of megahertz, and the band coverage is wide. Transmission line transformers are constructed according to the working principles of transmission lines and transformers.

Some other techniques

The power synthesis technology is that multiple power amplifiers amplify the same input signal, and then use the synthesis method to add the output power of each amplifier. The principle circuit of power combination is composed of an amplifier, power combination, and distribution network. Combination and distribution networks are commonly composed of transmission line transformers. The characteristic of this synthesis technology is that the working state of one of the amplifiers changes, and the work of the other amplifiers are not affected.

To further improve the efficiency of the power amplifier, the input signal is converted into a pulse sequence first and then converted into an analog signal after being amplified. This kind of power amplifier works in pulse amplification, and its theoretical efficiency can reach 100%, which is called a Class D amplifier. Due to the unsatisfactory switching characteristics of active devices, increasing the operating frequency of this type of power amplifier is limited. In the power amplifier, due to the large heat loss, the main heating part of the active device should be equipped with a radiator, and sometimes air cooling, water cooling, or evaporative cooling should be used to reduce the temperature rise of the device.

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