Integrated circuit and light receiver

An integrated circuit formed on a semiconductor substrate, for converting an electric current signal inputted from an external light receiving element, into a voltage signal, said integrated circuit comprising:

• an amplifier for amplifying the electric current signal from the external light receiving element and then converting it into the voltage signal;
• and
• a low-pass filter for performing filtering of a bias voltage to be applied to the external light receiving element;
• wherein the low-pass filter has a resistor and a capacitor serial-connection in which multiple capacitive elements are serially connected;
• wherein one end of the resistor is connected to a power terminal to which the bias voltage is inputted, and the other end of the resistor is connected to an input terminal of the capacitor serial-connection and to a bias application electrode of the external light receiving element through which the bias voltage is applied;
• and
• wherein each connection terminal between two of the serially connected capacitive elements in the capacitor serial-connection is connected to a capacitance terminal to which a ground potential as a reference for the bias voltage is connected selectively, and an output terminal of the capacitor serial-connection is fixed at the ground potential, and the capacitance terminal is a wire bonding pad formed in the integrated circuit.