A switchable dual-band LNA with simultaneous noise and input impedance matching for GSM/TD-SCDMA applications

A switchable dual-band low power low noise amplifier operated at 900MHz/1.95GHz has been designed for GSM/TD-SCDMA applications using 0.13 μm CMOS process. To achieve noise matching and input matching at both bands, a tunable capacitance bank and a switchable inductor for L-match are utilized. Four gain modes are accommodated with current splitting technique at the second stage. The post-layout simulated results are gains of 26.5 dB and 25.2 dB, and noise figures of 1.85 dB and 2.05 dB at the two frequency bands, respectively. The total power consumption is 7.5 mW under 1.2 V voltage supply.