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Abridged Switch Glossary
Insertion Loss
Isolation
Vswr
Power Handling Capability
Switching Time
Video Leakage
Input Drive Requirements
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Control Devices
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RF Switches
SPST to SP16T Switches
• High Frequency Switches
• Low Frequency Switches
• Drop-in Switches
High Power Switches
High Power Switches
Voltage Variable Attenuators – VVA
Digitally Controlled Attenuators – DCA
Step Attenuators
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Abridged Switch Glossary
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Control devices Products
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RF Switches (SPST to SP4T Switches; High Power Switches)
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Insertion Loss
The difference in Power, measured
in dB, between
input and output levels when the
unit is at low loss
condition and all other throws are off.
Isolation
The difference in power, measured in dB, between
input and output
levels when the unit
is at high loss
condition. Isolation
of the off throws in multi-throw switches
is measured with another throw at low loss condition and is properly terminated.
Vswr
The ratio between the reflected signal and the incident signal.
Power Handling Capability
The maximum CW power to which the unit can be subjected without possible permanent damage. This rating is based on the assumption that a 50-ohm source and load are used and that the control voltages and temperature range are within the specified limits.
Switching Time
The time required for the device to attain 90% of the final RF signal referenced to the 50% level of the command logic (See Figure 35).
Video Leakage
One of the consequences of the fast switching is the switching transients which appear at the RF ports and generally is referred to as video leakage.The transients are due to the DC shifts which occur internally in the switch during switching. Transients can cause problems because their spectral content can cause false signals to occur during switching. The problem is particularly serious when the spectral content is inside the RF band of the switch. The frequency of the transient spectral content is a function of the speed of the switch. Faster switching produces transient energy at higher frequencies. The amplitude of the transients is higher for faster switching speeds and for switches designed for lower frequencies. To decrease this effect, A.Uvitech or uses built-in, miniature, low-loss, High-Pass filters. Another way to increase
this effect is by using slower switching speed switches.
Video leakage is specified in several ways. One approach is to specify the maximum allowable amplitude of the transient found at each of the RF ports. Alternately, when the majority of the spectral content is outside the switch RF band, transient amplitude can be specified in-band only. This can be measured by filtering off the out-of-band transient energy. An additional method specified the spectral content, in dBm, in the RF band of interest.
Input Drive Requirements
Speed "0" Logic "1" Logic
Low speed 0.8 V max, 1.6 ma 2.5 V min, 0.04 ma
High speed 0.8 V max, 5.0 ma 2.5 V min, 4.0 ma
Provided for high speed modules.
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