Patent ID: 7057460

Claim:
A differential amplifier comprising: a first electrical path comprising a first transistor and a first resistance element, where the first transistor is coupled to a current source and the first resistance element is coupled to a voltage source; a second electrical path comprising a second transistor and a second resistance element, where the second transistor is coupled to the current source and the second resistance element is coupled to the voltage source; a first adjustable current source, coupled between the voltage source and a first node located between the first transistor and the first resistance element, that provides a first biasing current for the first electrical path; and a second adjustable current source, coupled between the voltage source and a second node located between the second transistor and the second resistance element, that provides a second biasing current for the second electrical path, wherein: the first electrical path further comprises a third transistor electrically coupled between the first node and the first resistance element, the second electrical path further comprises a fourth transistor electrically coupled between the second node and the second resistance element, and the third transistor and the fourth transistor share a common gate bias.