A broadband low noise amplifier for high performance wireless microphones

In this paper, a new CMOS broadband low-voltage low-noise amplifier (LNA) is proposed with an operating frequency range of 100MHz-2.5GHz with current reuse, resistor feedback, inductor feedback, mirror bias, inductor peaking and source inductive degeneration techniques. The proposed LNA uses inductor feedback and gain boosted technique to increase its high frequency gain to achieve high gain and wide bandwidth. It uses source inductive degeneration technique to reduce its noise figure and improve its input matching performance. Moreover, it also uses current reuse and mirror bias techniques to reduce its power consumption. Therefore, the LNA with high gain, wide bandwidth, good gain flatness performance and low power consumption by proposed method. The simulation results show that the power gain is around 10dB (s21), the NF is less than 2.5dB, the input reflection coefficient (S11) is less than −10.5 and the 1dB compression point (PldB) is about −11dBm. The LNA consumes maximum power at about 5.5mW with a 1V power supply. The proposed LNA is implemented in a TSMC 0.18um RF COMS process.