A number of comparators are provided where each has a differential input coupled to receive a transmission line analog signal level. A first trench is formed around an exterior of the resistor to a depth sufficient enough to reach the semiconductor substrate. The cylinder 21 includes a covering member provided in a bottom portion of the cylinder, and a cylinder body having an opening that is closed by the covering member. The method also comprises the application server sending a message to the authentication server requesting linkage of the tag with a user identification associated with the device.