Current/voltage converter and D/A converter

摘要

A current/voltage converter includes a current source connected to a first node; a first transistor element connected between the first node and a power supply or ground; a second transistor element which is connected between a second node and the power supply or ground, whose control terminal is connected to that of the first transistor element; a first control circuit which controls the voltages of control terminals of the first and second transistor elements so that the voltage of the first node becomes substantially equal to that of a bias voltage as one of inputs to the first control circuit; a second control circuit controlling the voltage of the second node so as to become substantially equal to that of the first node; and a resistance element one end of which is connected to the second node, and which converts the current flowing through the second transistor element into a voltage.