Apparatuses and methods of using multiple radios of a wireless access node of a wireless network are disclosed. Every gate terminal of a transistor to be tested is coupled to a gate voltage source in such a manner that the gate voltage can be measured and adjusted individually on every gate terminal. An upper liner layer and an upper device isolation layer are formed on the entire surface of the semiconductor substrate including the lower isolation pattern, and then etched to form the upper liner pattern. The resolver has an excitation winding and an output winding, with the excitation winding being in electrical communication with the bridge tied load amplifier.