Patent ID: 7564272

Claim:
A differential amplifier, comprising: a first load element coupled between a first voltage and a first node; a second load element coupled between the first voltage and a second node; a current source coupled between a second voltage and a third node; a first input element, coupled between the first node and the third node, that receives an input signal so as to adjust a voltage level of the first node; a second input element, coupled between the second node and the third node, that receives a reference voltage signal so as to adjust a voltage level of the second node; and a third input element, coupled between the second node and the third node, the third input element comprising an inverter, which receives and inverts the input signal, and a transistor, which receives the inverted input signal so as to adjust the voltage level of the second node, wherein the third input element turns on when a voltage level of the input signal is lower than a voltage level of the reference voltage signal.