A 2–10GHz ultra-wideband high gain negative feedback low-noise amplifier

This paper presents the design and implementation of a miniaturized ultra-wideband low noise amplifier (LNA) suitable for RF system. The LNA is based on negative feedback topology and reduces the size of the circuit greatly. By using a 4.7 Ω resistance in series with the drain of each transistor, the design yields excellent stability at a wide frequency band. The LNA is fabricated on a Rogers RO4003C board with size of 91.5mm*25mm. Over the wide operating frequency band of 2–10GHz, the measured results demonstrate an excellent performance with the gain of higher than 34dB, in-band flatness of less than 3.37dB, S11 of less than −10.95dB, S22 of less than −11.04dB, a low noise figure of less than 3.49dB and a low power consumption.