Patent ID: 7205839

Claim:
An apparatus for generating differential signals, the apparatus comprising: a first operational amplifier receiving a first signal; a second operational amplifier receiving a second signal; a first transistor, the first transistor including a first gate, a first terminal, and a second terminal; a second transistor, the second transistor including a second gate, a third terminal, and a fourth terminal; a first resistor coupled to the first terminal and the third terminal; a second resistor coupled to the second terminal and the fourth terminal; a first current supplier coupled to the first terminal; a second current supplier coupled to the second terminal; a third current supplier coupled to the third terminal; a fourth current supplier coupled to the fourth terminal; wherein: the gate of the first transistor is coupled to the first operational amplifier; the gate of the second transistor is coupled to the second operational amplifier; the second terminal is configured to output a third signal; the fourth terminal is configured to output a fourth signal; a first difference between the fourth signal and the third signal is substantially proportional to a second difference between the first signal and the second signal.