Patent ID: 7573331
Filing Date: 2009-08-11
Classification: G11B,H03F

Abstract:
1. An amplifier for amplifying differential input signals comprising a first and a second input signal, the amplifier comprising: a first PMOSFET and a first NMOSFET each having a gate responsive to the first input signal; a second PMOSFET and a second NMOSFET each having a gate responsive to the second input signal; at a first node, a first source/drain of the first PMOSFET connected to a first source/drain of the first NMOSFET; at a second node, a first source/drain of the second PMOSFET connected to a first source/drain of the second NMOSFET; a first current source supplying a first DC bias current at a second source/drain of each of the first and the second PMOSFETS; and a second current source supplying a second DC bias current at a second source/drain of each of the first and the second NMOSFETS, wherein the first DC bias current is different from the second DC bias current, wherein a first load current at the first node is based on a current through the first PMOSFET and a current through the first NMOSFET, and wherein a second load current at the second node is based on a current through the second PMOSFET and a current through the second NMOSFET.