A Wideband Noise-Cancelling Receiver Front-End Using a Linearized Transconductor

Duksoo KIM  Byungjoon KIM  Sangwook NAM  

Publication
IEICE TRANSACTIONS on Electronics   Vol.E100-C   No.3   pp.340-343
Publication Date: 2017/03/01
Online ISSN: 1745-1353
Type of Manuscript: BRIEF PAPER
Category: Microwaves, Millimeter-Waves
Keyword: 
wideband receiver,  transconductor linearization,  noise-cancelling,  

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Summary: 
A wideband noise-cancelling receiver front-end is proposed in this brief. As a basic architecture, a low-noise transconductance amplifier, a passive mixer, and a transimpedance amplifier are employed to compose the wideband receiver. To achieve wideband input matching for the transconductor, a global feedback method is adopted. Since the wideband receiver has to minimize linearity degradation if a large blocker signal exists out-of-band, a linearization technique is applied for the transconductor circuit. The linearization cancels third-order intermodulation distortion components and increases linearity; however, the additional circuits used in linearization generate excessive noise. A noise-cancelling architecture that employs an auxiliary path cancels noise signals generated in the main path. The designed receiver front-end is fabricated using a 65-nm CMOS process. The receiver operates in the frequency range of 25 MHz-2 GHz with a gain of 49.7 dB. The in-band input-referred third-order intercept point is improved by 12.3 dB when the linearization is activated, demonstrating the effectiveness of the linearization technique.