| 摘要 |
PROBLEM TO BE SOLVED: To provide a voltage-current conversion circuit that can conduct voltage and current conversion having low distortions. SOLUTION: This voltage-current conversion circuit 30 is provided with a bias circuit 1, a capacitor C1, a capacitor C2, NPN transistors NT1-4 and impedance elements Z1-5. In the NPN transistor NT1, RF input voltage Vin(+) is inputted to the base, and in the NPN transistor NT2, RF input voltage Vin(-) which is opposite in phase to that of the RF input voltage Vin(+) is inputted to the base (a control terminal). The impedance element Z1 is connected at one end to the base of the NPN transistor NT1. The impedance element Z2 is connected at one end to the base of the NPN transistor NT2, and the other end is connected to the other end of the impedance element Z1. Voltage is supplied from the bias circuit 1 to the other end of the impedance elements Z1 and Z2, and a differential voltage, substantially equal to äVin(+)-Vin(-)}, is impressed on both ends of the impedance element Z3 and the impedance element Z4. COPYRIGHT: (C)2009,JPO&INPIT
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