A Low-Noise 40-GS/s Continuous-Time Bandpass $\Delta\Sigma$ ADC Centered at 2 GHz for Direct Sampling Receivers
A Low-Noise 40-GS/s Continuous-Time Bandpass $\Delta\Sigma$ ADC Centered at 2 GHz for Direct Sampling Receivers
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用于直接采样接收器的低噪声 40GS/s 连续时间带通 $DeltaSigma$ ADC，中心频率为 2 GHz
DOI：
10.1109/jssc.2007.894794
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发表时间：
2007
影响因子：
5.4
通讯作者：
S. Voinigescu
中科院分区：
文献类型：
--
作者：
T. Chalvatzis;E. Gagnon;Morris Repeta;S. Voinigescu
本文提出了一种以2ghz为中心的40-GS/s连续带通DeltaSigma模数转换器，用于无线基站应用。ADC由一个具有多重反馈的四阶环路组成，完全设计在s域。该电路在60 MHz和120 MHz带宽下，SNDR分别为55 dB和52 dB， SFDR为61dB，单端IIP3为+4 dBm。中心频率在1.8 - 2ghz范围内可调。它采用基于MOS-HBT级联码变换器的Gm-LCVAR滤波器，NFMIN为2.29 dB。整个电路采用130纳米SiGe BiCMOS技术和150 ghz fT SiGe HBT实现，2.5 v电源功耗为1.6 W
This paper presents a 40-GS/s continuous-time bandpass DeltaSigma analog-to-digital converter centered at 2 GHz for wireless base station applications. The ADC consists of a fourth-order loop with multiple feedback and is designed entirely in the s-domain. The circuit achieves an SNDR of 55 dB and 52 dB over bandwidths of 60 MHz and 120 MHz, respectively, and an SFDR of 61dB with a single-ended IIP3 of +4 dBm. The center frequency is tunable from 1.8 to 2 GHz. It employs a Gm-LCVAR filter based on a MOS-HBT cascode transconductor with an NFMIN of 2.29 dB. The entire circuit is implemented in a 130-nm SiGe BiCMOS technology with 150-GHz fT SiGe HBT and dissipates 1.6 W from a 2.5-V supply