Transformer-based current-reuse amplifier with embedded IQ generation for compact image rejection architecture in multi-band millimeter-wave 5G communication

A transformer-based in-phase and quadrature (IQ) combiner circuit with an integrated amplifier, the IQ combiner circuit comprising:

• a differential balun comprising a first inductor and a second inductor, the first inductor having a first input terminal and a first output terminal, the second inductor having a second input terminal and a second output terminal;
• a third inductor magnetically coupled with the first inductor, the third inductor having a first isolation terminal and a third input terminal;
• a fourth inductor magnetically coupled with the second inductor, the fourth inductor having a second isolation terminal and a fourth input terminal;
• a first transistor coupled to the first input terminal of the first inductor;
• a second transistor coupled to the second input terminal of the second inductor, wherein the first transistor, the second transistor, the first inductor, and the second inductor form a part of an in-phase differential amplifier;
• a third transistor coupled to the third input terminal of the third inductor;
• and
• a fourth transistor coupled to the fourth input terminal of the fourth inductor, wherein the third transistor, the fourth transistor, the third inductor, and the fourth inductor form a part of a quadrature-phase differential amplifier.

A transformer-based in-phase and quadrature (IQ) combiner circuit with an integrated amplifier, the IQ combiner circuit comprising:

• a differential balun comprising a first inductor and a second inductor, the first inductor having a first input terminal and a first output terminal, the second inductor having a second input terminal and a second output terminal;
• a third inductor magnetically coupled with the first inductor, the third inductor having a first isolation terminal and a third input terminal;
• a fourth inductor magnetically coupled with the second inductor, the fourth inductor having a second isolation terminal and a fourth input terminal;
• a first transistor coupled to the first input terminal of the first inductor;
• a second transistor coupled to the second input terminal of the second inductor, wherein the first transistor, the second transistor, the first inductor, and the second inductor form a part of an in-phase differential amplifier;
• a first resistor coupled between the first isolation terminal of the third inductor and a voltage source;
• and
• a second resistor coupled to the second isolation terminal of the fourth inductor and the voltage source.

A transformer-based in-phase and quadrature (IQ) combiner circuit with an integrated amplifier, the IQ combiner circuit comprising:

• a differential balun comprising a first inductor and a second inductor, the first inductor having a first input terminal and a first output terminal, the second inductor having a second input terminal and a second output terminal;
• a third inductor magnetically coupled with the first inductor, the third inductor having a first isolation terminal and a third input terminal;
• a fourth inductor magnetically coupled with the second inductor, the fourth inductor having a second isolation terminal and a fourth input terminal;
• a first transistor coupled to the first input terminal of the first inductor;
• a second transistor coupled to the second input terminal of the second inductor, wherein the first transistor, the second transistor, the first inductor, and the second inductor form a part of an in-phase differential amplifier;
• a third resistor coupled between the first output terminal of the first inductor and a voltage source;
• and
• a fourth resistor coupled to the second output terminal of the second inductor and the voltage source.