A baseband amplifier (210.1) configured to convert a differential signal into a single-ended output voltage, the baseband amplifier comprising: a trans-impedance amplifier having an input and an output, the trans-impedance amplifier is configured to generate a first differential voltage at the output from the differential signal at the input; a low-pass filter having an input and an output, the input is connected to the output of the trans-impedance amplifier, the low-pass filter is configured to filter the first differential voltage to generate a second differential voltage at the output; an amplifier having an input and an output, the input of the amplifier is connected to the output of the low pass filter, the amplifier is configured to generate, at the output, the single-ended output voltage from the second differential voltage; and an output pin coupled to the output of the amplifier, wherein the differential signal comprises a differential current, wherein the trans-impedance amplifier comprises two serial stages (601, 602), wherein the first stage includes a wideband amplifier and a narrowband amplifier coupled in parallel and further comprises one of the following: a) switches to couple either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage, b) the wideband amplifier and the narrowband amplifier configured to each being controllable by an on/off control signal for coupling either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage, and c) switches to couple the output of the narrowband amplifier to the second stage, wherein the wideband amplifier is configured to being controllable by an on/off control signal, wherein the switches and the on/off control signal are used for coupling either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage. a trans-impedance amplifier having an input and an output, the trans-impedance amplifier is configured to generate a first differential voltage at the output from the differential signal at the input; a low-pass filter having an input and an output, the input is connected to the output of the trans-impedance amplifier, the low-pass filter is configured to filter the first differential voltage to generate a second differential voltage at the output; an amplifier having an input and an output, the input of the amplifier is connected to the output of the low pass filter, the amplifier is configured to generate, at the output, the single-ended output voltage from the second differential voltage; and an output pin coupled to the output of the amplifier, wherein the differential signal comprises a differential current, wherein the trans-impedance amplifier comprises two serial stages (601, 602), wherein the first stage includes a wideband amplifier and a narrowband amplifier coupled in parallel and further comprises one of the following: a) switches to couple either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage, b) the wideband amplifier and the narrowband amplifier configured to each being controllable by an on/off control signal for coupling either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage, and c) switches to couple the output of the narrowband amplifier to the second stage, wherein the wideband amplifier is configured to being controllable by an on/off control signal, wherein the switches and the on/off control signal are used for coupling either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage. a) switches to couple either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage, b) the wideband amplifier and the narrowband amplifier configured to each being controllable by an on/off control signal for coupling either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage, and c) switches to couple the output of the narrowband amplifier to the second stage, wherein the wideband amplifier is configured to being controllable by an on/off control signal, wherein the switches and the on/off control signal are used for coupling either the output of the narrowband amplifier or the output of the wideband amplifier to the second stage.