Load-modulated balanced amplifier (LMBA) based on variable cross-coupled pair (XCP)

A load-modulated balanced amplifier (LMBA) based on a variable cross-coupled pair (XCP), comprising an adaptive bias (ADB) circuit, a first balance terminal amplifier module, a second balance terminal amplifier module, a control terminal amplifier module, a first driver amplifier module, a second driver amplifier module, a third driver amplifier module, a variable XCP, first resistor, a second resistor, a first 90-degree differential coupler, a second 90-degree differential coupler, and a third 90-degree differential coupler, wherein

• an input terminal of the ADB circuit and a third input terminal of the first 90-degree differential coupler each serve as an input terminal of an amplifier;
• one terminal of an isolated terminal of the first 90-degree differential coupler is connected to the other terminal of the isolated terminal of the first 90-degree differential coupler through the first resistor;
• a pass-through terminal of the first 90-degree differential coupler comprises one terminal connected to a first input terminal of the second 90-degree differential coupler, and the other terminal connected to a second input terminal of the second 90-degree differential coupler;
• one terminal of an isolated terminal of the second 90-degree differential coupler is connected to the other terminal of the isolated terminal of the second 90-degree differential coupler through the second resistor;
• a third output terminal of the first 90-degree differential coupler is connected to an input terminal of the third driver amplifier module;
• an output terminal of the third driver amplifier module is connected to an input terminal of the control terminal amplifier module;
• a coupling terminal of the degree differential coupler comprises one terminal connected to a first input terminal of the first driver amplifier module, and the other terminal connected to a second input terminal of the first driver amplifier module;
• a pass-through terminal of the second 90-degree differential coupler comprises one terminal connected to a first input terminal of the second driver amplifier module, and the other terminal connected to a second input terminal of the second driver amplifier module;
• an output terminal of the first driver amplifier module is connected to an input terminal of the first balance terminal amplifier module;
• an output terminal of the second driver amplifier module is connected to an input terminal of the second balance terminal amplifier module;
• a first output terminal and a second output terminal of the first balance terminal amplifier module are respectively connected to one terminal of a pass-through terminal of the third 90-degree differential coupler and the other terminal of the pass-through terminal of the third 90-degree differential coupler;
• the second balance terminal amplifier module comprises a first output terminal connected to one terminal of a coupling terminal of the third 90-degree differential coupler, and a second output terminal connected to the other terminal of the coupling terminal of the third 90-degree differential coupler;
• an output terminal of the control terminal amplifier module is connected to an isolated terminal of the third 90-degree differential coupler;
• and an output terminal of the third 90-degree differential coupler serves as an output terminal of the millimeter-wave LMBA based on the variable XCP.