公开(公告)号：US08970307B2

公开(公告)日：2015-03-03

申请号：US13741571

申请日：2013-01-15

Applicant: QUALCOMM Incorporated

Inventor： Thomas Domenick Marra ,  Aristotele Hadjichristos ,  Nathan M Pletcher

IPC: H03G3/10 ,  H03F3/68

CPC classification number: H03F1/301 ,  H03F1/30 ,  H03F3/04 ,  H03F3/189

Abstract: Techniques for monitoring and controlling bias current of amplifiers are described. In an exemplary design, an apparatus may include an amplifier and a bias circuit. The amplifier may include at least one transistor coupled to an inductor. The bias circuit may generate at least one bias voltage for the at least one transistor in the amplifier to obtain a target bias current for the amplifier. The bias circuit may generate the at least one bias voltage based on a voltage across the inductor in the amplifier, or a current through a current mirror formed with one of the at least one transistor in the amplifier, or a gate-to-source voltage of one of the at least one transistor in the amplifier, or a voltage in a replica circuit replicating the amplifier, or a current applied to the amplifier with a switched mode power supply disabled.