RF Test and Measurement

 

 Specialized techniques and instruments for measuring performance at higher frequencies.

Optimize Dynamic Range for Distortion Measurements

Author
Keysight Technologies

This application note from Agilent describes the challenges of measuring distortion products from your device under test. The challenges arise from the need to measure weak distortion product and harmonic signals in the presence of strong carrier signals, combined with the fact that the analog components in the test instrumentation produce their own unwanted distortion signals.

Measuring the Nonlinearities of RF Amplifiers IP2/IP3

Author
Rohde-Schwarz

This application note, Measuring the Nonlinearities of RF Amplifiers Using Signal Generators and a Spectrum Analyzer, from Rohde-Schwarz covers the measurement of amplifier nonlinearities. It includes a very useful discussion of the relationship between harmonics and their intermodulation products. Particularly, the ratio between the second harmonic intercept point and IP2 is described. Several useful figures are supplied to aid understanding.

HP Phase Noise Seminar Notes

These notes from a seminar given by HP in the mid-80's serve as a useful reference for some of the fundamental relationships governing phase noise. Needless to say, some of the most recent techniques in phase noise measurements are not represented, but the mechanisms that generate phase noise are described in useful detail.

Getting Its Measure: Oscillator Phase Noise Measurement Techniques and Limitations

Author
Rohde, U.L.; Poddar, A.K.; Apte, A.M.

This is a detailed article comparing phase noise measurement techniques and their advantages and disadvantages. You will need to be a member of the Microwave Theory and Techniques society of the IEEE to view the article for free. A purchase option may be available if you are not a member.

Broadband Impedance Matching

Author
Anthony Bichler

In this tutorial from High Frequency Electronics magazine, Anthony Bichler describes a technique to achieve broadband matching networks using the Smith Chart. The tutorial article also includes a review of Smith Chart fundamentals. The technique that is described goes beyond simply keeping the quality factor of the network to a minimum.