BESLEME VE RF GİRİŞ GÜCÜ ŞARTLARININ WİMAX GÜÇ YÜKSELTECİ PERFORMANS PARAMETRELERİNE OLAN ETKİSİNİN İNCELENMESİ

Öz

Bu çalışmada 50MHZ-6GHz frekans aralığında çalışan SBB5089Z Güç Yükselteci (GY) modülünün, RF giriş gücü (P_giriş) -20dBm’den 10dBm’e kadar 2dB’lik artış ile ve besleme gerilim değerleri (V_DC) 0V’dan 5V’a kadar 75mV’luk adımlarla değiştirilmiştir. Çalışmada değişen V_DC ve P_giriş değerlerine göre P_çıkış, kazanç (G) ve eklenmiş güç verimliliği (EGV (%)) grafikleri 3.5GHz ve 5.8GHz WiMAX frekanslarında ayrı ayrı incelenmiştir. Değişen RF P_giriş ve V_DC değerlerine göre GY modülü P_giriş-V_DC’ye karşılık P_çıkış, G ve EGV (%) grafikleri ayrı ayrı incelenmiştir. GY modülü RF P_giriş koşulları manuel olarak RF sinyal jeneratörü ile DC gerilim değerleri ise Arduino’lu R/2R sayısal analog dönüştürücü (SAD) ve LM324 gerilim izleyici devresi kullanılarak değiştirilmiştir. Çalışmada elde edilen verilere göre 1dB kazanç sıkıştırma noktasına (P_1dB) kadar artırılan P_giriş değerlerine ve 5V’a kadar artırılan V_DC değerlerine göre GY P_çıkış, G ve EGV(%) davranışının olumlu yönde değiştiği gözlenmiştir.

Anahtar Kelimeler

• WiMAX,Güç Yükselteci,RF Giriş Gücü,Besleme Koşulları,Arduino

INVESTIGATION OF THE EFFECT OF BIASING AND RF INPUT POWER CONDITIONS ON WIMAX POWER AMPLIFIER PERFORMANCE PARAMETERS

Öz

In this study, DC conditions (V_DC) and RF input power (P_input) of SBB5089Z power amplifier (PA) module that operates 50MHZ-6GHz frequency interval, have changed. RF P_input have changed from -20dBm to 10dBm with 2dB steps, as well as V_DC has changed with 75mV steps-6 bit resolution- from 0V to 5V. P_output, gain (G) and power added efficiency (PAE (%)) have investigated graphically according to varying RF P_input and V_DC at 3.5GHz and 5.8GHz WiMAX frequencies. RF P_input of PA module conditions have manually changed with RF signal generator, as well as DC conditions have changed with Arduino biasing control unit which includes R/2R digital analog converter (DAC) and LM324 voltage follower. According to the data obtained in this study, it has been observed that behavior of P_output, G and EGV (%) have changed positively according to the increase of P_input up to 1dB gain compression point (P_1dB) and V_DC values increased up to 5V. 

Anahtar Kelimeler

• WiMAX,Power Amplifier,RF Input Power,Biasing Conditions,Arduino

Kaynakça

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