| 摘要 |
A BALUN circuit (20) for low voltage operation for receiving single ended input signal at an input terminal (24) and providing a differential output signal across a pair of output terminals (OUT+, OUT−) is disclosed. The BALUN circuit (20) comprises a first branch including an input terminal (24) for receiving a single ended input voltage signal (RFin), a transistor (Q1), a resistance (R1) (28), a resistance (RL), and an output terminal (OUT+). A second branch includes a transistor (Q3), a resistance (RL) and an output terminal (OUT−). An operational amplifier (26) maintains current flowing through the resistances RL in the first and second branches substantially equal to each other, in dependence upon the output voltage signal across the output terminals (OUT+, OUT−).
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