TERMINAL CIRCUIT, SEMICONDUCTOR DEVICE, AND TESTING SYSTEM

摘要

A terminal circuit comprises a pMOS transistor, an inductor, and a capacitor. The source of the pMOS transistor is connected to a signal terminal which either outputs, or receives as input, a transmission signal, the drain thereof is connected to a ground wire, and a control signal is received with the gate. The pMOS transistor is on when a function of rectifying characteristic impedance is active and off when the rectifying function is inactive. The inductor and the capacitor are connected to the signal terminal in order to rectify the characteristic impedance. Either switching the pMOS transistor on or off via the control signal allows switching the characteristic impedance rectifying function by the terminal circuit to either active or inactive. It is thus possible, for example, to implement a state wherein a terminal resistor is in place and monitor a signal level of a transmission signal at an output terminal without connecting an external terminal resistor.