Patent ID: 7035615

Claim:
A mixer circuit comprising: a first circuit including a first active element and a second active element; and a second circuit including a third active element and a fourth active element, each of the first through the fourth active elements having a first terminal, a second terminal, and a third terminal, the amount and the direction of the current flowing from the second terminal to the third terminal being changed based on the voltage applied between the first terminal and the second terminal, the second terminals of the first active element and the second active element being connected to each other and connected to a second power supply via a first bias and impedance part of the second terminal side, and the second terminals of the third active element and the fourth active element being connected to each other and connected to the second power supply via a second bias and impedance part of the second terminal side, the first terminals of the first active element and the fourth active element being respectively connected to a first input terminal and a second input terminal, and the first terminals of the second active element and the third active element being connected to each other and connected to a third input terminal, the first input terminals of the first through fourth active elements being respectively connected to a first voltage via the first bias and impedance parts, to maintain a prescribed operational bias voltage, the connection point of the third terminal of the first active element and the third active element being connected to a first power supply via a first output terminal and a bias and impedance part of the first output side, and the connection point of the third terminal of the second active element and the fourth active element being connected to a first power supply via a second output terminal and a bias and impedance part of the second output side, and the first terminal of the fourth active element being connected to an LO frequency input terminal.