Tunable current mirror and its application in LNA |
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| Li Kun, Teng Jianfu, Yu Changliang, Huang Jianyao. Tunable current mirror and its application in LNA[J]. Journal of Semiconductors, 2009, 30(12): 125012. doi: 10.1088/1674-4926/30/12/125012 Li K, Teng J F, Yu C L, Huang J Y. Tunable current mirror and its application in LNA[J]. J. Semicond., 2009, 30(12): 125012. doi: 10.1088/1674-4926/30/12/125012.Export: BibTex EndNote |
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| Authors: | Li Kun Teng Jianfu Yu Changliang Huang Jianyao |
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| Affiliation: | School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China;School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China;School of Electronic and Information Engineering, Tianjin University of Technology, Tianjin 300384, China;School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China;School of Electronic and Information Engineering, Tianjin University, Tianjin 300072, China |
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| Abstract: | A novel topology of current mirror (CM) with tunable output current is proposed. Two methods for output current tuning are presented. The first one utilizes an analog input voltage for linear current output, and the second one has an N-bit digital input signal for 2~N un-continuous current outputs. A linearization method for low noise amplifier (LNA) is proposed and realized with this tunable CM. As the provider of the bias current, the CM has brought the LNA a lower NF (noise figure) and a higher IIP3 (input-referred third-order intercept point) compared with a conventional one. The experimental results show that the LNA achieves 1.47 dB NF and + 19.83 dBm IIP3 at 860 MHz. |
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| Keywords: | current mirror tunable LNA bias current linearization |
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