SPA-1118Z

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RF Amplifiers are key components in modern communications and broadcast systems. They are used to amplify radio frequency signals across a wide range of frequencies, from kHz up to hundreds of GHz. There are various different types of RF Amplifiers available, including Broadband, Low Noise, High Power, and Variable Gain Amplifiers.

One popular type of RF Amplifier is the SPA-1118Z. This amplifier is designed specifically for use in microwave communication systems, covering frequencies up to 10.5 GHz. It is a class-AB design, providing a good combination of power gain and linearity. The key features and specifications of the SPA-1118Z are:

• Frequency range: 0.3–10.5 GHz
• Measured power gain: 28 dB typ. @ 3 GHz
• Power output (P1dB): +33.5 dBm @ 3 GHz
• Gain flatness: ± 0.75 dB @ 3 GHz
• Noise figure: 2.2 dB typ. @ 3 GHz
• Third-order intercept point (IP3): +39.5 dBm @ 3 GHz
• Input/output VSWR: 2.0:1 max.

Due to its high power gain and linearity, the SPA-1118Z is ideally suited for high power communication systems. It can be used to boost signal power and increase system sensitivity. The amplifier is also useful in low noise systems, providing a low noise figure of 2.2 dB. The amplifier has a wide dynamic range, with an IP3 of +39.5 dBm, providing excellent intermodulation distortion characteristics.

To ensure stable operation, the SPA-1118Z includes a number of protection circuits. These include a decoupling network to protect against overvoltage, a thermal sensor for overtemperature protection, and a short circuit protection circuit. The amplifier is also equipped with two external alarms. These alarms detect any abnormal conditions and can be connected to external monitoring systems.

The working principle of the SPA-1118Z is based on its class-AB amplifying design. In this design, the output stage consist of two transistors, a common emitter transistor and an emitter follower transistor. The common emitter transistor provides the amplifier’s gain, while the emitter follower transistor provides the necessary current to drive the amplifier’s output stage. The two transistors are coupled together, with the output from one transistor being inputted into the other. This gives the SPA-1118Z its high power gain and linearity.

In addition, the amplifier includes several other building blocks which are essential for ensuring reliable operation. These include a directional coupler, a power detector, and a temperature compensator. The directional coupler is used to sample the forward and reflected signals of the amplifier, while the power detector is used to measure the output power. The temperature compensator is used to adjust the amplifier’s bias to account for temperature changes.

The SPA-1118Z is a highly versatile RF Amplifier, suitable for a wide range of applications in the fields of microwave communications and broadcasting. Its high power, low noise figure, and wide dynamic range make it ideal for use in high power communication systems. Its protection circuits also ensure that the amplifier remains stable under harsh conditions.

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