HP an 1287-4 free download

File name an_1287-4.pdf

Network Analyzer Measurements: Filter and Amplifier Examples Application Note 1287-4 Table of Contents Page Introduction 2 Measuring a Filter 2 Error Correction for Accurate Passband Measurements 3 Swept-Power Amplifier Measurements 4 Evaluating AM-to-PM Conversion 5 2 Introduction The network analyzer is used for a variety of device and component characterization tasks in both laboratory and production environments. This highly accurate instrument can evaluate both active and passive components, as will be demonstrated in this application note for measurements of a filter and amplifier. With the addition of time-domain capability, a network analyzer can also gate out unwanted responses during measurements, leaving only the desired information. Hewlett-Packard Company offers a wide range of RF and microwave network analyzers for measurements from DC to 110 GHz. These instruments are available with a wide range of options and test sets to simplify measurements in stand-alone and automatic-test-equipment (ATE) setups. Often, both the magnitude and phase behavior of a component can be critical to the performance of a communications system. A vector network analyzer can provide information on a wide range of these devices, from active devices such as amplifiers and transistors, to passive devices such as capacitors and filters. This application note illustrates swept-frequency measurements on an RF filter, and swept-power measurements on a communications-band amplifier. The amplifier is typical of those used in Global System for Mobile Communications (GSM) service. Measuring a Filter Complete characterization of filters is typically achieved with swept- frequency measurements. Shown in Figure 1 are the frequency responses of a filter. On the left and bottom we see the transmission response in