Patent ID: 7042291

Claim:
A balanced amplifier comprising: a first voltage-to-current converter, including a first input terminal to which a first differential input voltage of a differential input signal is applied, a second input terminal to which a first voltage is applied, a first current source supplying a first current, a second current source supplying a second current, a first subtractor generating a third current by subtracting, from the first current, a first sum current representing a first sum of currents corresponding to the first differential input voltage and the first voltage, a second subtractor generating a forth current by subtracting, from the second current, a second sum current representing a second sum of currents corresponding to the first differential input voltage and the first voltage, a first output terminal outputting the third current as a first differential output of a differential output signal and a second output terminal outputting the fourth current; and a second voltage-to-current converter including: a third input terminal to which a second differential voltage of the differential input signal is applied, a fourth input terminal to which a second input voltage is applied, a third current source supplying a fifth current, a fourth current source supplying a sixth current, a third subtractor generating a seventh current by subtracting, from the fifth current, a third sum current representing a third sum of currents corresponding to the second differential voltage and the second input voltage, a fourth subtractor generating an eighth current by subtracting, from the sixth current, a fourth sum current representing a fourth sum of currents corresponding to the second differential voltage and the second input voltage, a third output terminal outputting the seventh current as a second differential ouput of the differential output signal and a fourth output terminal outputting the eighth current, wherein the second input terminal the fourth input terminal, the second output terminal and the fourth output terminal are connected in common.