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Effect of collector bias current on the linearity of common-emitter BJT amplifiers |
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| Authors: | Li Kun Teng Jianfu Xuan Xiuwei |
| Affiliation: | 1. School of Electronic and Information Engineering, Tianjin University of Technology, Tianjin 300384,China 2. School of Electronic and Information Engineering, Tianjin University of Technology, Tianjin 300384,China; School of Electronic and Information Engineering, Tianjin University, Tianjin 300072,China 3. School of Electronic and Information Engineering, Tianjin University, Tianjin 300072,China |
| Abstract: | Using a Volterra series,an explicit formula is derived for the connection between input 3rd-order intercept point and collector bias current (Icq) in a common-emitter bipolar junction transistor amplifier.The analysis indicates that the larger ICq is,the more linear the amplifier is.Furthermore,this has been verified by experiment.This study also integrates a method called dynamic bias current for expanding the dynamic range of an LNA (low noise amplifier) as an application of the analysis result obtained above.IMR3 (3rd-order intermodulation rate) is applied to evaluate the LNA's performance with and without adopting this method in this study. |
| Keywords: | IIP3 collector bias current BJT dynamic bias current |
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