Optical receiver and transimpedance amplifier circuit

A transimpedance amplifier circuit comprising:

• a bias terminal configured to be electrically connected to a cathode of an external photodiode;
• an input terminal configured to be electrically connected to an anode of the external photodiode and receive a current signal from the external photodiode;
• an amplifier circuit having an input and an output, the amplifier circuit being configured to receive an input current through the input, to convert the input current to an output voltage, and to output the output voltage from the output;
• a first resistor electrically connected between the input and output of the amplifier circuit;
• a bypass circuit electrically connected to the input terminal, the bypass circuit being configured to decrease a first input impedance of the bypass circuit viewed from the input terminal and subtract a portion of the current signal from the current signal, when the bypass circuit is activated by a first control signal, and configured to increase the first input impedance, when the bypass circuit is deactivated by the first control signal;
• a filter circuit electrically connected to the bias terminal, the filter circuit being configured to increase a second input impedance of the filter circuit viewed from the bias terminal, when a damping function of the filter circuit is activated by a second control signal, and configured to decrease the second input impedance, when the damping function is deactivated by the second control signal;
• and
• a control circuit configured to generate the first control signal and the second control signal for activating the damping function of the filter circuit when the control circuit activates the bypass circuit in accordance with the output voltage and for deactivating the damping function of the filter circuit when the control circuit deactivates the bypass circuit in accordance with the output voltage.