Abstract
This paper presents a low-noise amplifier (LNA) design for multifunction receiver front-end. Based on the conventional noise cancelling technique, a gain-enhanced noise cancelling structure is presented and the effect of gain-enhanced stage is discussed. The wideband input matching is realized by a current-reuse common-source stage with an active feedback structure to alleviate the tradeoffs between NF, gain, and bandwidth. A peaking gate inductor is inserted to improve gain flatness and bandwidth of the designed amplifier. The proposed LNA was implemented in the 0.130 µm CMOS technology. It achieves a S11 of <−10 dB in a wide frequency range 0.1–8 GHz and a gain of >14 dB with a 14.5 dB peak. Over this range, a minimum NF of 2.6 dB is achieved and the total power consumption is only 17 mW from a power supply of 1.2 V. The results indicate that the proposed structure effectively improves the gain of conventional noise cancelling technique while the noise elimination and wideband input matching are maintained.
