公开(公告)号：JP2004140837A

公开(公告)日：2004-05-13

申请号：JP2003356305

申请日：2003-10-16

Applicant: Motorola Inc ,  モトローラ・インコーポレイテッドMotorola Incorporatred

Inventor： KLOMSDORF ARMIN ,  CONRAD CLARK ,  GREENE MATTHEW

IPC: H03F3/24 ,  H03F1/02 ,  H03F1/32 ,  H03F3/20 ,  H03G3/10 ,  H03G3/20 ,  H03G3/30 ,  H04B1/04 ,  H04Q7/32

CPC classification number: H03G3/3042 ,  H03F1/0261 ,  H03F1/0266 ,  H03F1/56 ,  H03F2200/321 ,  H03F2200/387 ,  H03F2200/405

Abstract: PROBLEM TO BE SOLVED: To provide a method and device for supplying load power at a plurality of different power levels.
SOLUTION: This method includes a transition between a high-power output and a low-power output of a power amplifier, when a signal with a common modulation format is amplified. A power amplifier, which outputs low power, is supplied with a bias different from a bias supplied to a power amplifier which outputs high power. The impedance at a low-power output is loaded to the amplifier, which is different from that given to a power amplifier which outputs high power. When there is at least one embodiment, the power amplifier is shifted between the high-power output and the low-power output at different threshold levels, depending on whether the amplifier transits from a high-power output to a low power output, or vice versa.
COPYRIGHT: (C)2004,JPO

公开(公告)号：GB2395382A

公开(公告)日：2004-05-19

申请号：GB0323873

申请日：2003-10-13

Applicant: MOTOROLA INC

Inventor： KLOMSDORF ARMIN ,  CONRAD CLARK ,  GREENE MATTHEW

IPC: H03F1/02 ,  H03F1/32 ,  H03F3/20 ,  H03F3/24 ,  H03G3/10 ,  H03G3/20 ,  H03G3/30 ,  H04B1/04 ,  H04Q7/32

Abstract: An amplifier is disclosed, suitable for a mobile transmitter, which is capable of supplying power to a load at a plurality of different power levels, and with increased efficiency at low power levels. The bias applied to the power amplifier at low power output differs from that applied at high power. In addition, the output of the amplifier is loaded with a different impedance at low power output, than at high power output. Thus, in comparison with prior art, it is possible at low power output to reduce the bias further, increasing efficiency, while the amount of noise or power transmitted in an adjacent channel remains acceptable. In an embodiment, the power amplifier changes between high and low power outputs at a different threshold level depending upon whether the amplifier is transition from a higher to a lower power output, or from a lower to a higher.

公开(公告)号：GB2395382B

公开(公告)日：2006-03-15

申请号：GB0323873

申请日：2003-10-13

Applicant: MOTOROLA INC

Inventor： KLOMSDORF ARMIN ,  CONRAD CLARK ,  GREENE MATTHEW

IPC: H03F3/24 ,  H03F1/02 ,  H03G3/30 ,  H03F1/32 ,  H03F3/20 ,  H03G3/10 ,  H03G3/20 ,  H04B1/04 ,  H04Q7/32

Abstract: The present invention provides a method and apparatus for supplying power to a load at a plurality of different power levels. The method includes changing between high and low power outputs of the power amplifier when amplifying a signal having a common modulation format. A different bias is applied to the power amplifier at the low power output than the bias applied to the power amplifier at the high power output. The output of the power amplifier is loaded with a different impedance at the low power output than the impedance loaded at the output of the power amplifier output at the high power output. In at least one embodiment, the power amplifier changes between high and low power outputs at a different threshold level dependant upon whether the power amplifier is transitioning from the high power output to the low power output, or whether the power amplifier is transitioning from the low power output to the high power output.