Wideband active bi-directional SiGe digital step attenuator using an active DPDT switch

Moon-Kyu Cho, I. Song, Zachary E. Fleetwood, J. Cressler
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引用次数: 1

Abstract

A 6-bit active bi-directional silicon-germanium (SiGe) digital step attenuator (DSA) with multi-octave bandwidth using an active double-pole double-throw (DPDT) switch is demonstrated. To compensate the insertion loss (IL) and frequency dependent loss characteristics of conventional passive attenuators without using any additional amplifier and equalizer, the proposed attenuator employs active DPDT switches, which provide 4-way switching and bi-directional operation. The measured gain is 7.0-9.6 dB and the input and output return loss is better than 9 dB for 2-20 GHz. The measured root mean square (RMS) amplitude and phase errors in the major state are less than 0.4 dB and 3.0 degree, respectively. The chip size is 1.43 × 1.23 mm2, including pads. The proposed active bi-directional DSA consumes 30 mA from a 2.5 V supply.
使用有源DPDT开关的宽带有源双向SiGe数字阶跃衰减器
介绍了一种采用主动双极双掷(DPDT)开关的具有多倍频宽的6位有源双向硅锗(SiGe)数字阶跃衰减器(DSA)。为了在不使用任何额外放大器和均衡器的情况下补偿传统无源衰减器的插入损耗(IL)和频率相关损耗特性,该衰减器采用主动DPDT开关,提供4路切换和双向操作。测量增益为7.0 ~ 9.6 dB, 2 ~ 20 GHz的输入输出回波损耗均优于9 dB。测量到的主态振幅和相位均方根误差分别小于0.4 dB和3.0度。芯片尺寸为1.43 × 1.23 mm2(包括衬垫)。提出的有源双向DSA从2.5 V电源消耗30 mA。
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