Agilent 5990-8047EN SINAD measurements Using the Keysight U8903A Audio Analyzer - Application Note c20140816 free download

File name 5990-8047EN SINAD measurements Using the Keysight U8903A Audio Analyzer - Application Note c20140816

Keysight Technologies SINAD Measurements Using the Keysight U8903A Audio Analyzer Application Note 02 | Keysight | SINAD Measurements Using the Keysight U8903A Audio Analyzer - Application Note This application note discusses the use of the Keysight Technologies, Inc U8903A Audio Analyzer in characterizing radio receiver sensitivity by means of measuring SINAD. An overview of the measurement is given and potential differences in results between the modern U8903A and older generation instruments like the 8903B are discussed. SINAD SINAD is an acronym for SIgnal, Noise And Distortion. It is an audio quality value that is typically used to specify the RF sensitivity of radio receivers. The ratio is usually expressed in dB and is calculated as per the equation: ms value of signal, noise, and distortion SINAD = 20Log ( ) rms value of noise and distortion There are other forms of this equation, depending on the exact form the values take. For example, if the values are powers then the equation would use 10Log. On the other hand, if the values are already in dB then the two components are simply subtracted. A higher SINAD value indicates higher quality audio. 03 | Keysight | SINAD Measurements Using the Keysight U8903A Audio Analyzer - Application Note Measuring SINAD The classic block diagram of a SINAD measurement is shown in Figure 1. An RF signal of appropriate frequency is applied to the receiver under test. This RF signal is generally modulated with a 1-kHz tone. On the top path, the audio signal from the receiver is passed straight through to the level measurement block which measures the combined level of the signal, noise and any distortion.