Sources of Error in RF Switching
Impedance mismatching can cause a variety of errors in an RF
multiplexing system. These errors can cause distorted waveforms,
overvoltage, or undervoltage conditions.
To minimize
RF impedance mismatching:
• Use the correct cable and connector for the circuit impedance
(50
Ω or 75Ω). Note that it is difficult to visually differentiate a
50
Ω 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 HP 34905A and HP 34906A do not
automatically terminate open channels.
Module Reference
Insertion Loss (50
W
)
Insertion Loss (75
W
)
Direct to Module
Using provided adapter cables
VSWR (50
W
) VSWR (75
W
)
8
Chapter 8 Tutorial
RF Signal Multiplexing
391
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