A Study of the Effect of DC Conditions on a 5.8 GHz Power Amplifier’s S-Parameters

Year 2019, , 195 - 202, 01.03.2019

Bilge Şenel , Mesud Kahriman

https://doi.org/10.21597/jist.441124

Abstract

This study investigates changes of S-parameters (S₂₁, S₁₁, S₂₂, S₁₂) of a SBB5089Z power amplifier module in relation to changing DC conditions. Behaviour of those linear performance parameters (S₂₁, S₁₁, S₂₂, S₁₂) was examined graphically. S-parameters of SBB5089Z were analysed covering the 5.8 GHz WiMAX frequency from 5.7 GHz to 5.9 GHz with 200 MHz bandwidth. DC conditions were controlled using a microcontroller, an R/2R Digital Analogue Converter (DAC) ladder circuit and a voltage follower with LM324. The R/2R ladder circuit and voltage follower with LM324 have been integrated with the microcontroller. Also ACS712 current sensor and ADS1115 16-bit Analog Digital Convertor (ADC) are integrated to the microcontroller. PA’s current was read with microcontroller.

Keywords

Power Amplifier, WiMAX, DC conditions, 5.8 GHz, microcontroller

Besleme Koşullarının 5.8 GHz Güç Yükselteci S-Parametreleri Etkisi Üzerine Bir Çalışma

Abstract

Bu çalışma, değişen DC koşullara bağlı olarak SBB5089Z güç yükselteç modülü S-parametrelerindeki (S₂₁, S₁₁, S₂₂, S₁₂) değişimleri araştırmaktadır. Doğrusal performans parametrelerinin (S₂₁, S₁₁, S₂₂, S₁₂) davranışı grafiksel olarak incelenmiştir. SBB5089Z' nin S-parametreleri, 5.8 GHz WiMAX frekansını kapsayan, 5.7 GHz'den 5.9 GHz'e kadar 200MHz bant genişliği ile analiz edilmiştir. DC koşullar, bir mikrodenetleyici, bir R/2R sayısal analog dönüştürücü merdiven devresi ve LM324’lü bir gerilim izleyici kullanılarak kontrol edilmiştir. R/2R merdiven devresi ve LM324’lü gerilim izleyici devresi mikrodenetleyici ile entegre edilmiştir. Aynı zamanda, mikrodenetleyiciye ACS712 akım sensörü ve ADS1115 16-bit analog sayısal dönüştürücü de entegre edilmiştir. Güç yükselteci akımı mikrodenetleyici ile ölçülmüştür.

Keywords

Güç Yükselteci, WiMAX, 5.8 GHz, DC koşullar, Mikrodenetleyici

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