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 0.130µm CMOS technology. It achieves a S11 of <-10dB in a wide frequency range 0.1-8GHz and a gain of >14dB with a 14.5dB peak. Over this range, a minimum NF of 2.6dB is achieved and the total power consumption is only 17mW from a power supply of 1.2V. 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.
