Patent ID: 7369096

Claim:
A Radio Frequency (RF) apparatus for servicing an antenna having a characteristic impedance, the RF apparatus comprising: a differential Power Amplifier (PA) having a differential PA output with a turned-on PA differential output impedance and a turned-off PA differential output impedance; a differential Low Noise Amplifier (LNA) having a differential LNA input with a turned-on LNA differential input impedance and a turned-off LNA differential input impedance; and a balun transformer comprising: a singled-ended winding coupled to the antenna; a differential winding having a first pair of tap connections coupled to the differential PA output and a second pair of tap connections coupled to the differential LNA input; a turns ratio of the single ended winding and the differential winding, wherein: the turns ratio and the first pair of tap connections impedance match the turned-on PA differential output impedance to the characteristic impedance of the antenna; and the turns ratio and the second pair of tap connections impedance match the turned-on LNA differential input impedance to the characteristic impedance of the antenna.