公开(公告)号：JP2001068942A

公开(公告)日：2001-03-16

申请号：JP2000216760

申请日：2000-07-18

Applicant: MOTOROLA INC

Inventor： KLOMSDORF ARMIN ,  WINKELMANN LUKE EDWARD ,  MICHAEL RANDOHAARU

IPC: H03F3/24 ,  H03F1/02 ,  H03F1/56 ,  H03F3/20 ,  H03G3/02 ,  H04B1/18 ,  H04B1/52

Abstract: PROBLEM TO BE SOLVED: To provide a power amplification load adjustment system that accurately controls impedance provided to a power amplifier output with a variable impedance network over a wide range. SOLUTION: This system 200 is provided with an amplifier 32 and a variable impedance network 36 coupled with the output of this amplifier 32. The variable impedance network 36 provides a plurality of kinds of impedance sets to the output of the power amplifier 32 in response to a load control signal. A control circuit generates a transmission power command and a channel frequency command. A memory 40 stores a plurality of control variables as a function of the output power and the frequency. The variable impedance network 36, the control circuit and a processor 38 connected to the control circuit extract a plurality of control variables in response to the transmission power command and the channel frequency command and generate a load control signal by using them.