Development of a Power Amplifier for VHF Frequency-hopping Communication System
Chen Ji-yue · Telecommunication Engineering · 2009
An RF power amplifier(PA) for frequency-hopping(FH) communication systems is designed,which has high linearity and can achieve high power output,low-power output more than 0.25 W,medium-power output more than 4.5 W,filter attenuation loss less than 2 dB,harmonic suppression more than 48 dB.The VHF FH transmitter system is introduced,including logic level conversion module,ring modulator module,RF central module,frequency synthesizer module and PA module.The performance of RF PA is emphatically analyzed,and the special method to enhance amplifier's linearity is pointed out.The design of RF PA's hardware circuit is provided.The final test shows that its performance completely meets even supasses the design requirements of system,and it has a strong practical applicability.