Patent ID: 8604877

Claim:
A differential amplifier, comprising: n amplifying module having a resistive ratio, receiving an input voltage, and amplifying the input voltage as an output voltage in accordance with the resistive ratio; a first resistor having a first end and a second end; a second resistor; a third resistor; a first PMOS having a first gate, a first source and a first drain; a first NMOS having a second gate, a second source and a second drain; a second PMOS having a third gate, a third source and a third drain; and a second NMOS having a fourth gate, a fourth source and a fourth drain, wherein the first source is coupled with the first end, the second drain and a first current source, the first gate receives a first input signal, the first drain is coupled with the second gate and a second current source, the second source is coupled with the third resistor and outputs a first output signal, the third source is coupled with the second end, the fourth drain and a third current source, the third gate receives a second input signal, the third drain is coupled with the fourth gate and a fourth current source, the fourth source is coupled with the second resistor and outputs a second output signal, the input voltage comprises the first input signal and the second input signal, and the output voltage comprises the first output signal and the second output signal.