A 1.3 mW 48 MHz 4 Channel MIMO Baseband Receiver With 65 dB Harmonic Rejection and 48.5 dB Spatial Signal Separation
A 1.3 mW 48 MHz 4 Channel MIMO Baseband Receiver With 65 dB Harmonic Rejection and 48.5 dB Spatial Signal Separation
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具有 65 dB 谐波抑制和 48.5 dB 空间信号分离度的 1.3 mW 48 MHz 4 通道 MIMO 基带接收器
DOI：
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发表时间：
2016
影响因子：
5.4
通讯作者：
G. Cauwenberghs
中科院分区：
文献类型：
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作者：
Chul Kim;Siddharth Joshi;C. Thomas;S. Ha;L. Larson;G. Cauwenberghs
提出了一种用于频谱和空间感知认知无线电应用的四通道多输入多输出（MIMO）复杂基带接收机。该MIMO基带接收机包括一个电容式抗谐波下变频混频器（HRM）接收机和一个单集成电路上的信号分离多输入多输出模拟核（MAC）。HRM接收器通过可编程的频谱下变频和滤波，以最小的谐波折叠来执行输入射频信号的频率选择。随后的MAC通过加权复矩阵乘法分离频谱重叠但空间不同的信号。整个信号路径采用节能的通用- c模拟电路实现，具有数字控制的电容加权，用于HRM中-24至+24 MHz的可配置基带下/上转换，以及MAC中具有4×4复杂（8×8 real） 14位系数的可编程空间滤波。测量表明HRM的谐波折叠抑制大于65 dB。65 nm CMOS集成电路占用3.27 mm2的有源面积，在1.2 V电源下，在45 MHz低电平下消耗480 μW的数字功率，在3 MHz基带下消耗840 μW的模拟功率。
A four-channel multi-input multi-output (MIMO) complex baseband receiver for spectrum and space-aware cognitive radio applications is presented. The MIMO baseband receiver comprises a capacitive harmonic-rejection downconverting mixer (HRM) receiver and a signal-separation multi-input multi-output analog core (MAC) on a single integrated circuit. The HRM receiver performs frequency selection of the incoming RF signals by programmable spectral downconversion and filtering with minimal harmonic folding. The subsequent MAC separates the spectrally overlapping but spatially diverse signals by weighted complex matrix multiplication. The entire signal path is implemented using energy-efficient gm-C analog circuits with digitally controlled capacitive weighting for configurable baseband down-/upconversion ranging from -24 to +24 MHz in the HRM, and programmable spatial filtering with 4×4 complex (8×8 real) 14-bit coefficients in the MAC. Measurements demonstrate greater than 65 dB harmonic-folding rejection by the HRM, and greater than 48.5 dB spatial signal separation by the MAC. The 65 nm CMOS IC occupies 3.27 mm2 active area, and consumes 480 μW digital power at 45 MHz LO and 840 μW analog power at 3 MHz baseband from a 1.2 V supply.