首页|An Ultra-wideband Doubler Chain with 43-65 dBc Fundamental Rejection in Ku/K/Ka Band
An Ultra-wideband Doubler Chain with 43-65 dBc Fundamental Rejection in Ku/K/Ka Band
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In this paper,a double-balanced doubler chain with＞43-dBc fundamental rejection over an ultra-wide bandwidth in 0.13-µm SiGe BiCMOS technology is proposed.To achieve high fundamental rejection,high output power,and high conversion gain over an ultra-wideband,a double-balanced doubler chain with pre-and post-drivers employs a bandwidth broadening technique and a ground shielding strategy.Analysis and comparison of the single-balanced and double-balanced doublers were conducted,with a focus on their fundamental rejection and circuit imbalance.Three doublers,including a passive single-balanced doubler,an active single-balanced doubler,and a pas-sive double-balanced doubler were designed to verify the performance and characteristics of the single-and double-balanced doublers.Measurements show that the proposed double-balanced doubler chain has approximately 15 dB better fundamental rejection,and more than twice the relative bandwidth compared to the single-balanced doubler chain fabricated with the same process.Over an 86.9％3-dB bandwidth from 13.4 GHz to 34 GHz,the double-balanced doubler chain delivers 14.7-dBm peak output power and has＞43-/33-dBc fundamental/third-harmonic rejection.To the authors'best knowledge,the proposed double-balanced doubler chain shows the highest fundamental rejection over an ultra-wideband among silicon-based doublers at millimeter-wave frequency bands.
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