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A Four-Channel Beamforming Down-Converter in 90-nm CMOS Utilizing Phase-Oversamp
90纳米CMOS工艺下实现四通道波束成形下变频器，采用相位过采样技术提升线性度和分辨率。
4GHz, 8-bit数字控制, 2% EVM, 5.5°相位误差
波束成形下变频器相位过采样CMOS多相LO
▸相位过采样技术实现高分辨率复杂增益
▸基于多相LO的被动混频器实现精确相位偏移
▸跨阻放大器组合实现波束成形加权与合并
Abstract
o Li , Student Member , IEEE, Dae Hyun Kwon , Student Member , IEEE,
Y un Chiu, Senior Member , IEEE, and Ada S. Y . Poon , Senior Member , IEEE
Abstract—In this paper, a 4-GHz, four-channel, analog-beam-
forming direct-conversion down-converter in 90-nm CMOS is
presented. Down-converting vector modulators (VMs) in each
channel multiply the inputs with complex beamforming weights
before summation between the different channels. The VMs are
based on a phase-oversampling technique that allows the