Patent ID: 11901867
Assignee: MURATA MANUFACTURING CO., LTD.
Field: Basic communication processes (Electrical engineering)
Classification: CPC H | IPC H

Claim 16:
17. A differential amplifier circuit comprising:
a first amplifier and a second amplifier that output a differential signal in a radio-frequency band;
a first inductor having a first end connected to an output end of the first amplifier, and a second end;
a second inductor having a first end connected to an output end of the second amplifier, and a second end,
the second end of the first inductor and the second end of the second inductor being connected to each other;
a choke inductor connected to the second end of the first inductor and the second end of the second inductor;
a third inductor disposed in parallel to the first inductor and the second inductor, the third inductor having a first end connected to the output end of the first amplifier, and a second end connected to the output end of the second amplifier;
a first capacitor having a first end connected to a midpoint of the third inductor, and a second end connected to a reference potential;
a transformer having a primary winding and a secondary winding that are electromagnetically coupled to each other, the transformer being configured to perform balanced-to-unbalanced conversion, the primary winding of the transformer being used to implement the first inductor and the second inductor; and
a series resonant circuit including one half of the third inductor and the first capacitor.