With regards the ADG9xx wideband CMOS switches. What is Insertion Loss and how is it defined?
Insertion Loss (IL) is the amount of signal attenuated between the input and output ports of the switch when the switch is in the on state. Expressed in decibels, insertion loss should be as small as possible to enable maximum power transfer.
The general equation for calculating insertion loss is as follows:
where: S21 is the forward transmission coefficient, measured from port 2 to port 1 of the switch with each port terminated in a purely resistive 50 Ω load. Note, S12 can also be used assuming the device is symmetrical.
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