Tunable current mirror and its application in LNA

• 作 者: 李琨 滕建辅 余长亮 黄建尧
• 机 构: School of Electronic and Information Engineering,Tianjin University,School of Electronic and Informa
• 出 处: 半导体学报
• 发表日期: 2009年12期
• 关键词: mirror tunable amplifier analog tuning provider figure topology linearization SF

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.

A novel topology of current mirror (CM) with tunable output current is proposed. Two methods for output current tuning are presented. The first one employs 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.