Abstract: An amplifier device having multiple amplification paths, such as a Doherty amplifier device, may include phase slope adjustment circuitry configured to adjust the frequency-dependent slope of the phase of an input carrier signal along a carrier path of the amplifier. By adjusting the phase slope of the input carrier signal in this way, the phase difference between carrier and peaking signals at an output combining node of the amplifier may be reduced, thereby reducing output power ripple of the amplifier. The phase slope adjustment circuitry may be a constant-k bandpass filter. The phase slope adjustment circuitry may have a zero-degree insertion phase at the center frequency of the amplifier. The phase slope adjustment circuitry may be implemented using surface mount inductors and capacitors.