Sources of Error in RF Switching
Impedance mismatching can cause a variety of errors in an RF
multiplexing system. These errors can cau se distorted waveforms,
overvoltage, or undervoltage conditions.
To minimize RF impedance mismatching:
•Use the correct cable and connector for the circ uit impedance
(50Ω or 75Ω). Note that it is difficult to visually differentiate a
50Ω connector from a 75Ω connector.
•Be sure that all leads and signal paths are properly terminated.
Unterminated sections of line can appear as near shorts at
RF frequencies. Note that the 34905A and 34906A do not
automatically terminate open channels.
Insertion Loss (50Ω)Insertion Loss (75Ω)
Direct to Module
Using provided adapter cables
VSWR (50Ω)VSWR (75Ω)
Module Reference
8
Chapter 8 Tutorial
RF Signal Multiplexing
391