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A Time-Approximation Filter for Direct RF Transmitter Shiyu Su Member IEEE and
提出一种可编程时间近似滤波器(TAF)，用于直接射频发射机架构，实现高效射频带通滤波。
65nm CMOS, -42dB EVM(20MHz 256-QAM), -43dB EVM(10MHz 1024-QAM), -158dBc/Hz噪声底(100MHz偏移)
时间近似滤波器直接射频发射机FIR滤波器CMOS误差矢量幅度
▸采用时间近似滤波器(TAF)技术
▸通过调制LO波形近似FIR滤波器脉冲响应
▸在频率上转换过程中实现等效RF带通滤波
Abstract
This article presents a highly programmable time-
approximation filter (TAF) that can be embedded in a direct RF
transmitter architecture. The proposed filter technique approx-
imates the impulse response of a finite impulse response (FIR)
filter with a modulated LO waveform, leading to an equivalent RF
bandpass filtering during the frequency up-conversion process.
The silicon prototype in 65-nm CMOS achieves an error vector
magnitude (EVM) performance of −42 dB for a 20-MHz,
256-QAM signal and −43 d