A 10～18GHz Wide-band Transformer feedback LNA

摘要

A wide-band (10～18GHz) low noise amplifier (LNA) is presented. With transformer feedback in the traditional cascode amplifier, good input matching is achieved from 10GHz to 18GHz. The noise figure is below 3.5dB over 10-18GHz. There is no input-matching elements in the input gate of the cascode amplifier, so that the LNA can achieve lower NF. The LNA is designed based on CMOS TSMC 0.18μm mixed signal/RF process. With 1.8V supply voltage and three stage amplifiers to achieve wider gain bandwidth, the LNA can achieve input-matching of -12dB over the bandwidth; minimum NF 2.4dB; gain (S21) of 17dB and 1dB gain compression (P1dB) at -22.6dB. The power consumption is 37.6mW (exclude buffer).