Analysis and Design of Ultra-Wideband Low-Noise Amplifier With Input/Output Bandwidth Optimization and Single-Ended/Differential-Input Reconfigurability

摘要

A CMOS low-noise amplifier (LNA) for ultra-wideband universal radio is presented. Based on capacitive cross-coupled dual- $g_{m}$-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 $muhbox{m}$ CMOS technology. The differential-input version achieves an 11–14 dB $S_{21}$, $leq -9 hbox{dB} S_{11}$ 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 $S_{21}$, $leq -10 hbox{dB} S_{11}$ among 2.4–11.7 GHz, and a minimum noise figure of 6.3 dB.