Certified Wireless Design Professional (CWDP) Practice Exam 2026 - Free CWDP Practice Questions and Study Guide

In a system involving amplifiers, the total noise figure (NF) can be calculated using the Friis formula when cascading multiple stages. However, in this particular scenario, we are examining an amplifier with a known noise figure and gain.

The noise figure is a measure of how much noise the amplifier adds to the signal it processes, expressed in dB. A noise figure of 10 dB indicates a significant amount of added noise relative to the signal. The gain of the amplifier is 0 dB, meaning it does not amplify the input signal; rather, it passes through the signal without loss or gain.

In this case, when calculating the total noise figure for a system composed of an amplifier with a gain of 0 dB, the total noise figure can be directly associated with the noise figure of the amplifier itself, since there's no gain component to offset the added noise. Therefore, the system's noise figure remains at 10 dB. Additional noise figures from subsequent stages can drastically affect the overall NF, particularly when the overall gain is not high enough to improve the system's performance.

It's worth pointing out that the total noise figure of the system should consider the combined effects of all components within the context of signal amplification. Given