JELE_V4_N4_RP1 Nimain Charan Nayak Journal on Electronics Engineering 2249 – 0760 4 4 5 10 Gilbert Mixer, Sub -Threshold, Flicker Noise, Current Bleeding, Broadband This paper presents a broadband low noise mixer based on a double balanced Gilbert cell that works between 1-6 GHz. One of the most important factors of the mixer noise figure is flicker noise. All transistors in this design are biased in the subthreshold region in order to suppress mixer noise figure. Also dynamic current injection circuit (current bleeding circuit) has been utilized to improve the noise performance. Shunt peaking technique is adopted to have a flat conversion gain. The simulation results of the designed mixer show 21.1 dB conversion gain and 6.41 dB average noise figure at 1 GHz - 6 GHz. Also simulation results demonstrate that, using current bleeding circuit, low noise figure is obtained . Its consumption power is 10.6 mW at 1.8V supply voltage. The noise figure is an important parameter to be considered in the design of Gilbert cell mixer and is further improved using the proposed method. A dynamic current injection technique with a tuning inductor has been employed in the mixer design in order to reduce the output noise corner frequency. The traditional Gilbert based wideband active mixers realized by pure bipolar and MOSFET have been demonstrated in recent years. June – August 2014 Copyright © 2014 i-manager publications. All rights reserved. i-manager Publications http://www.imanagerpublications.com/Article.aspx?ArticleId=3195