Abstract
A CMOS low-noise amplifier (LNA) for ultra-wideband universal radio is presented. Based on capacitive cross-coupled dual-gm-enhancement topology, the circuit topology could be reconfigured as different versions for single-ended or differential inputs. One possible input/output resonant scheme is analyzed and may help the LNA to exhibit input matching, low noise, and flat gain in an ultra-wide frequency band with relatively low power consumption. Both a differential-input-differential-output and a single-ended-input-differential-output version are fabricated in 0.18 mu m CMOS technology. The differential-input version achieves an 11-14 dB S-21, <= -9 dBS(11) within 1.4-11.4 GHz, and a minimum noise figure of 3.9 dB; the single-ended-input version achieves a 5-8 dB S21, <= -10 dBS(11) among 2.4-11.7 GHz, and a minimum noise figure of 6.3 dB.