Patent ID: 6919768

Claim:
A balanced amplifier comprising: a first voltage-to-current converter and a second voltage-to-current converter, each of the first voltage-to-current converter and the second voltage-to-current converter including a first input terminal, a second input terminal, a first current source which outputs a first current, a second current source which outputs a second current, a first output terminal outputting a third current, and a second output terminal outputting a fourth current, wherein the third current is obtained by subtracting a sum current from the first current, the sum current corresponding to sum of currents corresponding to voltages applied to the first input terminal and the second input terminal respectively, and the fourth current being obtained by subtracting the sum current from the second current, and wherein the second input terminal and second output terminal of the first voltage-to-current converter and the second input terminal and second output terminal of the second voltage-to-current converter are connected in common, a differential input signal is input to the first input terminals of the first voltage-to-current converter and the second voltage-to-current converter, and a differential output signal is output from the first output terminal of the first voltage-to-current converter and the second voltage-to-current converter.