Application Notes

The Hewlett-Packard ATF-36077 PHEMT device is described in a low noise amplifier for 2.3 GHz. The ATF-36077 is characterized for use as a low noise amplifier in 12 GHz DBS applications providing 0.5 dB noise figures. The device is also capable of noise figures below 0.4 dB at 2.3 GHz and below. The chief limitation in lowering amplifier noise figure is matching circuit losses. The amplifier described provides less than a 0.5 dB noise figure and greater than 15

To find the impedance, we need to measure at least two values because impedance is a complex quantity. Many modern impedance measuring instruments measure the real and the imaginary parts of an impedance vector and then convert them into the desired parameters such as |Z|, θ, |Y|, R, X, G, B, C, and L. It is only necessary to connect the unknown component, circuit, or material to the instrument.                     

This application note is part of a series about noise measurement. Much of what is discussed is either material that is common to most noise figure measurements or background material. It should prove useful as a primer on noise figure measurements. The need for highly repeatable, accurate and meaningful measurements of noise without the complexity of manual measurements and calculations has lead to the devel¬opment of noise figure measurement instruments with simple user interfaces. Using these instruments does not

This document presents a simple procedure for network analysis that is more cost-effective than the use of scalar network analyzers. It allows the accurate measurement of the transmission characteristics of filters, amplifiers and frequency converters over a large frequency and dynamic range. In order to reach very high measurement speeds, Rohde & Schwarz signal generators are operated in "List Mode", and Rohde & Schwarz power meters are operated in "Buffered Mode."