Fairview Microwave Blog
Low Noise Amplifiers Q&A
A low noise amplifier (LNA) is an essential active RF device in virtually all receiver (RX) front-ends (FE) and throughout the signal chain in many sensitive designs. LNAs are designed to amplify weak RF signals while introducing minimal noise into the signal chain. For these reasons, LNAs can be found at the front-end for essentially all test and measurement receivers, such as vector network...
What is a 90 Degree Hybrid Coupler?
A 90 Degree Hybrid Coupler is a one of the few hybrid coupler types, the others include 180 degree hybrid couplers and 0 degree hybrid couplers. 90-degree hybrid couplers are also known as quadrature couplers/hybrids, as any signal injected into any port will result in two 90 degree out-of-phase signals present on the other two ports. The output signals in a 90-degree hybrid coupler are...