Current-voltage conversion amplifier circuit including multiplier with a current offset removal unit and multi input amplifier

A multiplier comprising:

• a bias terminal applying a bias current to a first node;
• a start-up unit connected between the first node and a power terminal and applying an additional current to the first node;
• a reference voltage generation unit connected between a second node and a ground terminal and maintaining a voltage constantly between the second node and the ground terminal;
• a discharging unit connected between a third node and the ground terminal and discharging a voltage of the third node;
• a current offset removal unit connected between the power terminal and the second node and removing a dark current outputted even when light is not incident to a light receiving device;
• a current signal amplifier unit connected between the power terminal and an output terminal and amplifying a current signal outputted from the light receiving device and outputting the amplified current signal;
• and
• a current-voltage selection unit connected to a fourth node and converting the amplified current signal into a first voltage signal according to a conversion signal,
• wherein the light receiving device is connected to the third node.