Patent ID: 7054610

Claim:
A wireless terminal device for selectively receiving a desired channel from a plurality of channels, comprising: an antenna for receiving a radio-frequency signal including said plurality of channels; a local oscillator for oscillating a local oscillation signal; a first mixer of a differential type for mixing the radio-frequency signal sent from said antenna with the local oscillation signal sent from said local oscillator to produce a first base band signal and a second base band signal having a phase differing by 180 degrees from that of said first base band signal; a first low-pass filter of the differential type and a passive type for receiving said first and second base band signals from said first mixer; and a base band circuit for receiving said first and second base band signals passed through said first low-pass filter; wherein said first low-pass filter includes: a first inductor for passing and transmitting said first base band signal sent from said first mixer to said base band circuit; a second inductor for passing and transmitting said second base band signal sent from said first mixer to said base band circuit; and a capacitor coupled between said first and second inductors.