Patent ID: 6556085
Filing Date: 2003-04-29
Classification: H03F

Abstract:
A low power low noise amplifier, comprising:a common source transistor M1; a common source transistor M2; a common gate transistor M3 having a drain connected to a drain of the common source transistor M2; a capacitor C1 having one end coupled to a drain of the common source transistor M1 and a second end coupled to a gate of the common source transistor M2 and to a source of the common gate transistor M3, wherein a signal amplified by the common source transistor M1 is amplified after being coupled by capacitor C1 and then being applied to the gate of the common source transistor M2, a third-order intermodulation output of transistors M2 and M3 have opposite polarity to each other so that a total third-order intermodulation is cancelled at said connection between the drains of the transistors M2 and M3, and the transistors M1, M2, and M3 share a bias current.