Pseudo-doherty load modulated balanced amplifier

A pseudo-Doherty load modulated balanced amplifier, PD-LMBA, configured to operate in a given frequency band and comprising:

• a main splitter for splitting an input RF signal into a first signal and a second signal;
• a main amplifier for amplifying the first signal;
• a balanced amplifier for amplifying the second signal, said balanced amplifier comprising:
• a splitter for splitting the second signal into a first part and a second part of the second signal;
• a first amplifier and a second amplifier for amplifying the first part of the second signal and the second part of the second signal, respectively;
• and
• a combiner,
• wherein the combiner is configured for combining the amplified first signal, the amplified first part of the second signal, and the amplified second part of the second signal into an output RF signal;
• and
• a phase offset unit arranged upstream from the first amplifier and the second amplifier and downstream of the main splitter, wherein the phase offset unit comprises:
• at least one shunt series circuit connected to ground, each shunt series circuit comprising an impedance inverter and a termination circuit arranged in between the impedance inverter and ground, wherein the termination circuit is configured to present an RF short to the impedance inverter at a first frequency that lies inside or close to the frequency band, and wherein the impedance inverter is configured to transform the RF short to an RF open at the first frequency;
• and
• at least one parallel resonance circuit arranged in between an input and an output of the phase offset unit, wherein an impedance of the at least one parallel resonance circuit corresponds to an RF open at a second frequency that lies outside the frequency band,
• wherein the first frequency lies closer to a center frequency of the frequency band than the second frequency does.