What are the 4 Types of Microwave Amplifier use in Industry

 

Microwave amplifiers are used to amplify radio frequency (RF) signals in the microwave spectrum in the electronics industry. To get a high power output while the input signal is small, they are widely used in satellite transponders. In the Electromagnetic Compatibility (EMC) research industry, microwave amplifiers are also used for electronic system immunity testing.

There are 4 types of amplifiers for microwaves -

Amplifier with Low Noise (LNA)

This is an electronic amplifier designed to amplify a very low-power signal without greatly degrading its signal-to-noise ratio (SNR and Noise Figure (NF). An LNA increases the power of the input signal as well as the noise. By using certain trade-offs, such as selecting low-noise components, matching impedance, and selecting low-noise biasing conditions, they are designed to reduce additional noise. With a noise figure of less than 1 dB at low frequencies, they can achieve 40 dB of gain. 4 GHz to 96 GHz Raditek LNA cover

Power Amplifier (PA)

Unlike LNA, the signal is already improved at a relatively high level by the power amplifier (PA). The gain in PA is therefore low, but in a lossy medium like air, it works to improve the signal for transmission. Since the noise output is attenuated, the noise figure is not critical in PA. The power output is also constrained by the accessibility of the power devices. You can combine several amplifiers.

 

Amplifier Linear signal

These are generic amplifiers and are called 'gain blocks' occasionally. In the device, the Linear Signal Amplifier provides signal gain. These are normally followed by an LNA, so they are not necessarily the deciding factor in the system's dynamic range. The input power is higher than the LNA and lower than the PA in the Linear Signal Amplifier.

 

Amplifier Driver

Prior to the final PA level, the Driver Amplifier is usually used. They are also used in high-end electronic warfare, instrumentation, and applications for research and measurement. They are discrete and increase the maximum efficiency of the system.

 

A driver amplifier's noise figure is not as important as the LNA as long as the signal source's noise is not too high. In addition, a mixer's noise rejection of the subsequent circuitry such as LO-RF or LO-IF isolation is high enough to minimize the noise of the amplitude.