Patent ID: 7454182

Claim:
A mobile telephone terminal device, characterized in using, for the purpose of switching of a selected band between two bands and for the purpose of gain control in the selected band, an attenuator with switch function which comprises: a first variable resistor ( 41 ) inserted in a first signal line ( 47 ) which connects a first signal input part ( 43 ) with a first signal output part ( 45 ); and a second variable resistor ( 42 ) inserted in a second signal line ( 48 ) which connects a second signal input part ( 44 ) with a second signal output part ( 46 ), said attenuator being characterized in that as the attenuation of each one of said first and said second variable resistors ( 41 ) and ( 42 ) is controlled by means of a gain control voltage, either one of outputs on said first and said second signal lines ( 47 ) and ( 48 ) is blocked and the gain of the remaining output on said first and said second signal lines ( 47 ) and ( 48 ) is controlled linearly and continuously.