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RF Amplifiers

RF amplifiers are electrical devices used to amplify signal power in radio frequency (RF) circuits. They are most commonly used in radio communications, wireless networks, and other applications that require electromagnetic signals to be transmitted. Furthermore, they can be employed for frequency shifting, impedance matching, signal filtering, and signal conditioning. This article provides an overview of the SKY65708-51 RF amplifier, its application fields and working principle.

Overview

The SKY65708-51 RF amplifier is a high linearity, high-power amplifier module designed for use in microwave and millimeter-wave signal transmission applications. This model features 16 dBm typical output power, rising to a maximum of 21 dBm, and a maximum signal gain of 24 dB that can be adjusted externally. The amplifier operates from 4-10 GHz, making it suitable for both base-station and mobile applications. The unit offers excellent linearity performance, with a measured good-signal available output power of 15 dBm beyond 8 GHz, allowing for a wide dynamic range. It also supports unconditional stability with a rugged construction.

Application Fields

The SKY65708-51 is designed for use in a range of applications including base-station and mobile devices, including Wifi, cellular networks, satellite receivers, and high-data-rate point-to-point communication links. The amplifier module is especially suitable for applications that require high linearity and output power, such as cable, optical or IPTV networks, and digital video broadcast (DVB) applications. It is also suitable for military, medical, and industrial communications. Furthermore, the unit can be used in other RF systems where transmitting and receiving signals are required.

Working Principle

The SKY65708-51 is a linear power amplifier; it amplifies the modulated signal (input) without ‘distorting’ it. To accomplish this, it requires a bias current of about 100 mA, which is generated by a low-noise amplifier (LNA). This LNA is connected to the input of the power amplifier and to the output of the bias source. The bias source is usually a voltage regulator, which provides the stable voltage needed to produce the required bias current.

The signal that flows through the amplifier is then amplified at the stages of the power amplifier. This amplification is regulated by the level of the output voltage or current of the power amplifier. The output is then combined with the original modulated signal from the input, after which the signal is sent to the output connector of the amplifier. Generally, the maximum output level is governed by the bias current, while the linearity of the amplifier is decided by the input signal power and the gain of the amplifier.

Conclusion

The SKY65708-51 RF amplifier is a powerful and efficient device suitable for a wide range of applications. It can be used in base-stations and mobile devices, as well as in communication systems and digital video broadcast. The unit provides high linearity performance with a maximum output power of 21 dBm, along with a maximum signal gain of 24 dB. Furthermore, the amplifier works from 4-10 GHz, and supports unconditional stability with a rugged construction. Finally, the working principle of the SKY65708-51 is based on the amplifier amplifying the modulated signal without distortion, and uses a low-noise amplifier and a voltage regulator to create the necessary bias.

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