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Basically voltage and temperature effects on circuits are non-ideal or unwanted
situation you'd like to see. Thus people use thermistor, voltage sensing feedback
control to compensate them. For TX-RX transiver system, voltage variation is important to supply pushing effect which may degrade your performance, and for
Power amplifier, both voltage and temperature are quite important, and circuit designer often build in voltage limiter or temperature compensation circuits inside the chip. I think there must be some circuit whcih is sensitive but linearly relate circuit parameter to temperature/voltage variation where you can leverage this characteristic to debug somewhere in the circuit, BUT not really happen in GSM system.
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