Patent ID: 6301467
Filing Date: 2001-10-09
Classification: H03F,H04B

Abstract:
A communications device comprising:a transmitter,in said transmitter, a first active component and a second active component, each active component being in a circuit branch, both active components comprising a signal input for coupling an oscillating input signal to the active component, a signal output for coupling an oscillating output signal from the active component and a control input for setting the active component into an active state by a certain first control signal value coupled to said control input and into an inactive state by a certain second control signal value coupled to said control input,first coupling means for coupling the signal input of the first active component to the signal input of the second active component,second coupling means for coupling the signal output of the first active component to the signal output of the second active component at a common coupling point, at least one of the active components being coupled to said coupling point via an impedance matching circuit, an impedance of said active component coupled via said matching circuit which is in an inactive state functioning as part of the impedance matching circuit, so that the branch having an active component set into an inactive state appears as a high impedance at said coupling point, andcontrol means for selectively coupling a control signal to said first active component and said second active component to activate only one component, said control means having a first state and a second state, of which in said first state said control means is arranged to couple said first control signal value to the control input of said first active component and said second control signal value to the control input of said second active component, and in said second state said control means is arranged to couple said second control signal value to the control input of said first active component and said first control signal value to the control input of said second active component,wherein said first active component is a first power amplifier and said second active component is a second power amplifier, said control signal is based on a message about the power level, said message received from a base station.