Generally, in accordance with the various illustrative embodiments disclosed herein, a wideband amplifier includes a direct-current (DC) differential amplifier, an alternating-current (AC) differential amplifier, and a signal combiner circuit. The frequency response of each of the DC differential amplifier and the AC amplifier can be selectively modified by placing the wideband amplifier in one of at least three different operational configurations. The three different operational configurations can be broadly interpreted as a wideband operational configuration, a low-pass operational configuration, and a high-pass operational configuration. The signal combiner circuit operates as a low-pass filter connected to an output terminal of the DC differential amplifier and as a high-pass filter connected to an output terminal of the AC differential amplifier.