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采用可调谐有源电感复用结构,设计了一款用于3G TD-SCDMA和WLAN的2.4GHz/5.2GHz双频段低噪声放大器(DB-LNA)。2.4GHz频段电路采用折叠共源共栅(FC)结构,5.2GHz频段电路采用共栅(CG)结构。FC和CG结构均采用可调谐有源电感,通过调谐有源电感的等效阻抗,优化匹配到源阻抗。基于TSMC 0.18μm CMOS工艺,实现了有源电感复用型DB-LNA。ADS仿真结果表明,频率为2.4GHz时,S21=35dB,NF=4.42~4.59dB,IIP3=0dBm,P-1dB=-14dBm;频率为5.2GHz时,S21=34dB,NF=2.74~2.75dB,IIP3=-5dBm,P-1dB=-9dBm。
Using a tunable active-inductor multiplexing structure, a 2.4GHz / 5.2GHz dual-band low-noise amplifier (DB-LNA) for 3G TD-SCDMA and WLAN was designed. 2.4GHz band circuit using folded cascode (FC) structure, 5.2GHz band circuit with a common gate (CG) structure. Both FC and CG structures use a tunable active inductor that is tuned to match the source impedance by tuning the equivalent impedance of the active inductor. Based on the TSMC 0.18μm CMOS process, the active inductor multiplexing type DB-LNA is realized. ADS simulation results show that when the frequency is 2.4GHz, S21 = 35dB, NF = 4.42 ~ 4.59dB, IIP3 = 0dBm and P-1dB = -14dBm; S21 = 34dB and NF = 2.74 ~ 2.75dB at 5.2GHz, IIP3 = -5dBm, P-1dB = -9dBm.