Patent ID: 6069526
Filing Date: 2000-05-30
Classification: H03F

Abstract:
A power amplifier circuit arrangement, comprising:an input circuit for receiving an input signal; an amplifier;an output circuit for producing an output signal from the amplifier circuit;a first impedance transforming network having a first end coupled to an output of the amplifier and a second end coupled to the output circuit;a second impedance transforming network having first and second ends;a first switch for coupling an input signal to either the amplifier or to the first end of the second impedance-transforming network;a third impedance transforming network having a first end coupled to the second end of the first impedance transforming network and a second end;a second switch for coupling the second end of the third impedance transforming network to either the second end of the second impedance transforming network or to ground, operation of the second switch being coordinated with operation of the first switch such that the amplifier is bypassed when the first switch couples the input signal to the second impedance transforming network and the second switch couples the second end of the second impedance transforming network to the third impedance transforming network, the first and second switches and the second impedance transforming network constituting a bypass circuit.