LAB WM405 - Modulation Analysis FM

Using Jitter And Timing Functions To Analyze FM signals
LeCroy Applications Brief No. L.A.B. WM405

Modulation Analysis - FM
Using Jitter And Timing Functions To Analyze FM signals
The LeCroy WaveMaster se-
ries oscilloscopes incorporating
the Jitter and Timing Analysis 2
(JTA2) option are ideal for ex-
tracting the modulating wave-
form from a frequency modu-
lated (FM) signal. The frequency
deviation of the carrier, the
modulation frequency, and the
modulation index can all be de-
termined from the demodulated
waveform.

The analysis of a 10 MHz FM
signal with a 20 kHz sinewave
modulation and 110 kHz devia-
tion is shown in figure 1. The
acquired frequency modulated
waveform is shown in the upper Figure 1 Analysis of an FM signal using both Track of fre-
trace (C2). The JTA2 function