A Wideband Low-Noise Downconversion Mixerwith Positive-Negative Feedbacks

This paper presents a wideband low-noise mixer in cmos 0.13-um technology that operates between 2–10.5 ghz. the mixer has a gilbert cell configuration that employs broadband low-noise trans conductors designed using the negative-positive feedback technique used in low-noise amplifier designs. this method allows broadband input matching. the current-bleeding technique is also used so that a high conversion gain can be achieved. simulation results show excellent noise and gain performance across the frequency span with an average double-sideband noise figure of 2.9 db and a conversion gain of 15.5 db. it has a third-order intermodulation intercept point of -8.7 dbm at 5 ghz.