Mesud KAHRİMAN, Fatih Ahmet ŞENEL, Bilge ŞENEL

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

Bu çalışmada 50MHZ-6GHz frekans aralığında çalışan SBB5089Z Güç Yükselteci (GY) modülünün, RF giriş gücü (Pgiriş) -20dBm’den 10dBm’e kadar 2dB’lik artış ile ve besleme gerilim değerleri (VDC) 0V’dan 5V’a kadar 75mV’luk adımlarla değiştirilmiştir. Çalışmada değişen VDC ve Pgiriş değerlerine göre Pçıkış, kazanç (G) ve eklenmiş güç verimliliği (EGV (%)) grafikleri 3.5GHz ve 5.8GHz WiMAX frekanslarında ayrı ayrı incelenmiştir. Değişen RF Pgiriş ve VDC değerlerine göre GY modülü Pgiriş-VDC’ye karşılık Pçıkış, G ve EGV (%) grafikleri ayrı ayrı incelenmiştir. GY modülü RF Pgiriş 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 (P1dB) kadar artırılan Pgiriş değerlerine ve 5V’a kadar artırılan VDC değerlerine göre GY Pçıkış, 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

In this study, DC conditions (VDC) and RF input power (Pinput) of SBB5089Z power amplifier (PA) module that operates 50MHZ-6GHz frequency interval, have changed. RF Pinput have changed from -20dBm to 10dBm with 2dB steps, as well as VDC has changed with 75mV steps-6 bit resolution- from 0V to 5V. Poutput, gain (G) and power added efficiency (PAE (%)) have investigated graphically according to varying RF Pinput and VDC at 3.5GHz and 5.8GHz WiMAX frequencies. RF Pinput 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 Poutput, G and EGV (%) have changed positively according to the increase of Pinput up to 1dB gain compression point (P1dB) and VDC values increased up to 5V.

Keywords:

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

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