Modeling and Analysis of the Non-ideality of LO Pulse Overlap for Multi-phase Passive Mixer First RF Frontend
Modeling and Analysis of the Non-ideality of LO Pulse Overlap for Multi-phase Passive Mixer First RF Frontend
复制标题
多相无源混频器第一射频前端本振脉冲重叠非理想性建模与分析
DOI：
10.1142/s0218126619500865
复制
发表时间：
--
期刊：
影响因子：
--
通讯作者：
Liu Shi-bin
中科院分区：
文献类型：
--
作者：
Du Yongqian;Hu wei;Li Gui-fang;Liu Shi-bin
多相无源混频器（PM）优先射频前端因其与LNA优先前端相比令人满意的噪声性能而重新受到广泛关注。此外，可重新配置的阻抗、双向信号透明性和双向阻抗转换性能使多相PM优先RF前端具有广阔的应用前景。然而，它仍然存在着许多非理想性，其中相邻本振（LO）脉冲重叠是目前尚缺乏深入研究的非理想性，以及LO脉冲重叠如何衰减多相PM优先射频前端的阻抗匹配和噪声性能尚不清楚。在这项工作中，一个精确的模型，首次建立和分析，揭示如何本振脉冲重叠衰减的阻抗匹配和噪声性能的多相PM-第一RF前端。分析和仿真结果表明，本振重叠将严重影响阻抗匹配，当本振脉冲重叠超过2%时，阻抗匹配将崩溃;当本振脉冲重叠在0%~ 2%范围内时，噪声系数（NF）下降了3.1 dB。此外，即使已经提出了扼流电感器技术和通过引入同步相移信号的技术来抑制LO重叠，增益和噪声性能也会恶化，或者功率和芯片面积成本很大。为了解决这个问题，本振脉冲重叠抑制技术提出了进一步通过引入重叠保护因子（OLSF）在这项工作中。主信号路径中小于2[公式：见正文][公式：见正文]的附加阻抗使得OLSF方案有利于噪声和增益的改善，并且与现有LO重叠抑制技术相比，所提出的OLSF方案具有功率、面积（0.04[公式：见正文]mm[公式：见正文]和成本效益。
Multi-phase passive mixer (PM) first RF frontend has regained great concern for its satisfactory noise performance comparable to LNA-first frontend. Moreover, the re-configurable impedance, bi-directional signal transparency and bi-directional impedance translation performance enable a splendid application future for the multi-phase PM-first RF frontend. However, it still suffers from quite a few nonidealities, among which the adjacent Local Oscillator (LO) pulse overlap is the remaining nonideality lacking deep research, and how the LO pulse overlap decays the impedance matching and noise performance of multi-phase PM-first RF frontend remains unclear. In this work, an accurate model is, for the first time, established and analyzed to reveal how the LO pulse overlap decays the impedance matching and noise performance of multi-phase PM-first RF frontend. The analytical and simulation results demonstrate that the impedance matching will be drastically deteriorated because of LO overlap, and when LO pulse overlap exceeds 2% the impedance matching will be collapsed, while the noise figure (NF) is deteriorated by 3.1 dB when LO overlap ranges from 0% to 2%. Moreover, even a chocking inductor technique and a technique by introducing a synchronous phase-shifted signal have been proposed to suppress the LO overlap, the gain and noise performance can be deteriorated or the power and chip area cost are big. To address this question, a LO pulse overlap suppression technique is proposed furthermore by introducing an overlap safeguard factor (OLSF) in this work. The additional impedance smaller than 2[Formula: see text][Formula: see text] in the main signal path makes the OLSF scheme beneficial for noise and gain improvement, and the proposed OLSF scheme is power, area (0.04[Formula: see text]mm[Formula: see text] and cost efficient compared with existing LO overlap suppression techniques.