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It tells you in the last paragraph. I guess that it helps to reduce the zener noise
The zener does not need so much shunt current, also reduces dissipation.
Set the voltage to maximum and the current to your constant current value. Connect our load and the power supply will do it's best to be a constant current source. If the load resistance is too high there may not be enough voltage to supply the required current. In that case you need a...
Probably not. If it was a direct hit to the antenna the lightening would probably just jump from the radio to the nearest ground (earth). The spark will have travelled several hundred metres from a storm cloud to the antenna, a few more metres of air are unlikely to stop it. Even if it did not...
If you read section 5.3.6 and 5.3.7 it explains how to use external clock signals and the internal clock circuits.
External clocks are used when better stability is needed or to synchronise with another system
Conservation of energy law applies, so yes you are right.
If it is a real antenna and real world losses are included then the antenna can have a lower gain than isotropic.
S-parameters are measured with the device with a 50 ohm source and load. The data sheet gives the performance with matching circuits between the device and 50 ohms, hence the increased gain.
That is because that is the order you need to be able to meet your requirements.
The filters it designs should be OK. Be sure to check the Compensate for GBW box for component values, and if the requirement is critical simulate it in SPICE with the component tolerances. High order filters can be...
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