Patent ID: 6320468
Filing Date: 2001-11-20
Classification: H03F

Abstract:
A multi-stage amplifier for amplifying radio frequency signals, the amplifier comprising:a first amplifier stage having a first transistor, the first transistor having a first bias terminal connected to a reference voltage through a first connection circuit;a second amplifier stage having a second transistor, the second transistor having a second bias terminal connected to a reference voltage through a second connection circuit;a first transmission line connecting a portion of the first connection circuit to a portion of the second connection circuit; anda resistive element connected in parallel with the first transmission line between the portion of the first connection circuit and the portion of the second connection circuit for suppressing oscillation conditions at either of the first and second bias terminals;wherein the first connection circuit includes a second transmission line connected serially to a first bypass capacitor at a first node;wherein the second connection circuit includes a third transmission line connected serially to a second bypass capacitor at a second node;wherein the first transmission line connects the first and second nodes; andwherein the resistive element is connected in parallel with the first transmission line between the first and second nodes.