QPA5389A

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QPA5389A application field and working principle

The QPA5389A belongs to the category of linear amplifiers, video amps and modules. It is a wideband amplifier developed for high output power and high efficiency. Its primary application fields include in-vehicle and satellite systems where linear radio performance and power efficiency are of utmost importance. Its operating principle is that of an active matching network which provides linear amplification, while allowing efficient power operation.

Features and Typical Applications

The QPA5389A offers several features which make it suitable for use in industrial, medical, and communication application fields. Due to its low power consumption, it is particularly suited for use in mobile applications. The amplifier can provide both linear and wideband amplifications, making it a good choice for a variety of applications. The maximum output power is rated at 35 dBm and the wideband gain is rated at 18 dB. It also provides a broad RF frequency range from 0.5 to 3 GHz, enabling it to be used in a wide range of application fields.

The QPA5389A is ideal for applications requiring an efficient and linear power amplifier such as mobile radios, base station radios, broadcasting, and communication systems. It can also be used for applications such as wireless standards testing, automotive systems, and wireless systems.

Working Principle

The QPA5389A works on a principle of active matching network which makes both linear and power operation possible. It uses transconductance grids to achieve maximum efficiency and wideband gain. The transconductance grids in the input stage of the amplifier transform RF signals into DC voltages and then drive the output stage with the DC voltage. This DC voltage is used to reduce the power consumption of the amplifier while providing linear output power.

The output stage of the amplifier comprises of two transistors, one of which controls the RF bias of the output stage. The bias is adjusted in order to obtain optimum linear performance and power efficiency. The output of the amplifier is fed to the load through the RF matching network in order to get the desired gain and maximum efficiency from the amplifier.

Conclusion

The QPA5389A is a high efficiency, linear power amplifier suitable for a wide range of applications. Its wide frequency range and low power consumption make it ideal for use in mobile systems and in-vehicle systems. The active matching network used in its construction provides both linear amplification and efficient power operation. The QPA5389A is a good choice for applications which require high output power and high efficiency.

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