⚡ 本页包含 AI 生成的分析内容，仅供参考
该论文提出了一种面向5G-NR的1.4至2.7GHz FDD无SAW发射器，采用带宽扩展的N-path滤波器-调制器、隔离基带输入和宽带设计，解决了小双工间距（如NR-n74频段48MHz）下对接收频段产生低噪声的挑战，实现了低于-157.5dBc/Hz的带外噪声。
Achieving <-157.5dBc/Hz OB Noise Gengzhen Qi1, Haijun Shao1, Pui-In Mak1, Jun Yin1, Rui P. Martins1,2 University of Macau, Macau, China, 2University of Lisboa, Lisbon, Portugal 1 For the sub-6GHz 5G New Radio (5G-NR), most FDD bands expand their signal bandwidth (BW) to 20MHz. In the NR-n74 Band (~1.45GHz), the duplex spacing (∆f) is only 48MHz. Such a small ∆f/BW ratio (2.4) challenges the design of a multiband FDD SAW-less transmitter (TX) that must emit negligible noise at the nearby receiver (RX) band. Previous works [1,2] use high-order baseband (BB) filters, along with large bias currents, to suppress the out-of-band (OB) noise, but the power (>90mW) and area (~1mm2) are large for an OB noise of -158dBc/Hz [2]. Although the charge-domain direct-launch digital TX [3] is more flexible and area-efficient (0.22mm2), it entails off-chip baluns to extend the RF coverage, and has a limited output power (-3.5dBm). An alternative is to embed
Using a BW-Extended N-Path Filter-Modulator, an, Isolated-BB Input and a Wideband TIA-Based PA Driver