S-band low power consumption amplifier for RFID applications

A three-stage cascode low-power consumption high-gain HMIC LNA for radio frequency identification applications operating at 2.45GHz, has been demonstrated. Under low dc power bias of 3.0V and 0.46mA, the amplifier demonstrated the state-of-the-art performance with a gain of 30.34dB, input and output return losses of less than -10dB, NF of 4.18dB and the corresponding -1 dB compression point of -19.1dBm at 2.45GHz, achieving a Gain/P-dc figure of merit of 21.99dB/mW and a Gain/NF.P-dc ratio of 5.26/mW. The approach to design amplifier that can simultaneously provide low-power consumption, high gain, low noise figure and low VSWR, is presented in this paper.