Patent ID: 7629845

Claim:
An amplifier structure, comprising: a voltage source; a first amplifying unit electrically connected to the voltage source, amplifying a first input signal and a second input signal to generate a first amplified signal according to a bias current and a reference current, and comprising: a first transistor, having a source coupled to the voltage source and a gate to receive the bias current; a second transistor, having a source coupled to a drain of the first transistor and a gate to receive the first input signal; a third transistor, having a source coupled to the drain of the first transistor and a gate to receive the second input signal; a fourth transistor, having a drain coupled to a drain of the second transistor; a fifth transistor, having a drain coupled to a drain of the third transistor and a gate coupled to a gate of the fourth transistor; a sixth transistor, having a drain coupled to the source of the fourth transistor and a source coupled to a ground; a seventh transistor, having a drain coupled to the source of the fifth transistor, a gate coupled to a gate of the sixth transistor and a source coupled to the ground; and a first output terminal coupled between the drains of the third transistor and the fifth transistor to output the first amplifying signal; and a second amplifying unit electrically connected to the voltage source and the first amplifying unit, amplifying the first input signal and the second input signal to generate a second amplified signal according to the bias current and the reference current, wherein the amplifier generates an output signal according to the first amplified signal and the second amplified signal.