一种增益可多重调节的低功耗双频段低噪声放大器

为了同时满足无限局域网(wireless local area network,WLAN)和新一代无限保真(wireless fidelity,WIFI)无线通信标准,设计实现了一款增益可多重调节的低功耗双频段低噪声放大器(dual-band low noise amplifier with multiple gain-tunability,MGT-DBLNA).输入级采用串-并联谐振滤波网络以实现双频段输入匹配.放大级采用可调谐的有源电感作负载和偏置电压可变的电流复用结构,一方面,可通过调节有源电感的外部偏压和偏置电路的电压2种不同方式,对MGT-DBLNA的增益进行单独或联合调节,另一方面降低了功耗.输出级采用由电流镜以及共集电极放大器构成的可控缓冲器,可实现增益的进一步调节.基于WIN 0.2μm Ga As HBT工艺库进行验证,结果表明:在不同工作频率2.4、5.2 GHz下,MGT-DBLNA的增益(S21)可分别在3.9~12.3 d B、12.6~20.2 d B范围内调节;输入回波损耗(S_(11))与输出回波损耗(S_(22))均小于-10.0 d B;噪声系数(noisefigure,NF)小于3.4 d B;在5.0 V的工作电压下,静态功耗小于20.0 m W.所提出的MGT-DBLNA不仅实现了增益的大范围调节,同时也降低了功耗.

Dual-band Low Noise Amplifier With Multiple Gain-Tunability and Low Power Consumption

A dual-band low noise amplifier with multiple gain-tunability ( MGT-DBLNA) was designed and implemented in order to satisfy the wireless communication standard of WLAN and novel WIFI. A serial-parallel resonant filter network was used at the input stage to achieve dual-band input impedance matching . A combination of an active inductor and a current reuse circuit with adjustable bias voltage port was employed at the amplifier stage to tune gain separately and combinationally to lower power consumption. A controllable buffer constituted by a current mirror and a common collector amplifier was utilized to further tune gain. Based on WIN 0. 2μm GaAs HBT process library, The verification results show that the MGT-DBLNA has tunable gain ( S21 ) ranges of 3. 9 ~12. 3DB and 12. 6 -20. 2 dB respectively at frequencies of 2. 4 GHz and 5. 2 GHz by multiple gain-adjustment methods. Both input return loss ( S11 ) and output return loss ( S22 ) are less than -10. 0 dB, the noise figure ( NF) are less than 3. 4 dB. With the supply voltage of 5. 0 V, the static power consumption is less than 20. 0 mW. The proposed MGT-DBLNA provides a large tunable-gain range and consumes lower power at the same time.