Patent ID: 7626454

Claim:
A radio frequency signal amplifying device comprising: a balun converting an unbalanced radio frequency signal into a balanced radio frequency signal; a primary amplifier differentially amplifying the balanced radio frequency signal from the balun; and a secondary amplifying group comprising at least one secondary amplifier secondarily and differentially amplifying the balanced radio frequency signal amplified from the primary amplifier, wherein the primary amplifier comprises: a first amplifying unit disposed between a driving power terminal supplying a predetermined driving power and a ground, the first amplifying unit differentially amplifying the balanced radio frequency signal and outputting a first balanced radio frequency signal having a predetermined voltage level; a second amplifying unit connected in series between the driving power terminal and the first amplifying unit, and complementarily switched on/off with the first amplifying unit, the second amplifying unit differentially amplifying the balanced RF signal and outputting a second balanced radio frequency signal having a voltage level higher than the voltage level of the first balanced radio frequency signal, and the secondary amplifying group comprises a first secondary amplifier, wherein the first secondary amplifier comprises: a third amplifying unit disposed between the driving power terminal and the ground, the third amplifying unit secondarily and differentially amplifying the first balanced radio frequency signal from the primary amplifier; and a fourth amplifying unit connected in series between the driving power terminal and the third amplifying unit, and complementarily switched on/off with the third amplifying unit, the fourth amplifying unit secondarily and differentially amplifying the second balanced radio frequency signal from the primary amplifier.