A fully integrated low-noise amplifier (LNA) with 0.4V supply voltage and ultra low power consumption at 1.5GHz by folded cascode structure is presented. The proposed LNA is designed in a TSMC 0.18 µm CMOS technology, in which all transistors are biased in sub-threshold region. Through the use of  proposed circuit for gain enhancement in this structure and using forward body bias technique, a very high figure of merit is achieved, in comparison to similar structures. The LNA provides a power gain of 14.7dB with a noise figure of 2.9dB while consuming only 790µW dc power. Also, impedance matching of input and output of the circuit in its operating frequency is desirable and in the whole bandwidth of the circuit, input and output isolation is below -33dB. Manuscript profile

Abstract— In this paper, a new ultra-low-voltage ultra-low-power operational transconductance amplifier (OTA) using feed-forward technique is proposed. The proposed topology is based on a bulk driven input differential pair employs a gain-stage in the Miller capacitor feedback path to improve the pole-splitting effect. In addition, through a coupling capacitance, input signal is simultaneously coupled to gate of idle transistors resulted dramatic enhancement in gain and unity gain-bandwidth (UGB) of the OTA. The circuit is designed in the 0.18µm CMOS technology. The simulation results show that the amplifier has a 90dB open-loop DC gain and a unity gain-bandwidth of 270 kHz while operating at 0.5V supply voltage. This technique show remarkable enhancement in unity gain-bandwidth and also in DC gain compared to the bulk driven input differential pair technique. The total power consumption is as low as 900nW which makes it suitable for low-power bio-medical applications. Manuscript profile