Current-to-voltage converter providing variable bandwidth and apparatus including the same

A current-to-voltage converter for converting a current signal into a voltage signal, the current-to-voltage converter comprising:

• a trans-impedance amplifier;
• a resistor-capacitor (RC) circuit comprising a resistor and a capacitor connected to each other in parallel;
• and
• a plurality of switches configured to perform:
• applying the RC circuit as a feedback to the trans-impedance amplifier in a wide bandwidth mode, and
• applying the RC circuit as a shunt between the current signal and ground in a narrow bandwidth mode.

An apparatus comprising:

• a signal processor configured to output a control signal and a current signal in a baseband;
• and
• a transmitter comprising a current-to-voltage converter configured to operate in at least one of a wide bandwidth mode and a narrow bandwidth mode according to the control signal, and convert the current signal into a voltage signal, the transmitter being configured to output a radio frequency (RF) signal based on the voltage signal,
• wherein the current-to-voltage converter comprises:
• a trans-impedance amplifier configured to power down in the narrow bandwidth mode;
• and
• a resistor-capacitor (RC) circuit comprising a resistor and a capacitor connected to each other in parallel and configured to allow at least a portion of the current signal to pass through in each of the wide bandwidth mode and the narrow bandwidth mode.