A Tunable 0.2–1.2-GHz N-Path Bandpass Filter With Improved Harmonic and Out-of-Band Rejection

IF 4.5 1区工程技术 Q2 ENGINEERING, ELECTRICAL & ELECTRONIC

IEEE Transactions on Microwave Theory and Techniques Pub Date : 2025-04-23 DOI:10.1109/TMTT.2025.3558245

Jingzhi Yang;Zhiqiang Gao

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引用次数: 0

Abstract

In this article, a novel cascaded N-Path filter architecture is proposed to enhance both out-of-band rejection and harmonic rejection (HR) of conventional N-Path filter. An active gain-boosted N-Path filter front end for signal amplification and noise suppression, and a passive N-Path filter with harmonic rejection switch backend provide high out-of-band and harmonic rejection and enhance linearity after cascade. The resulting filter is fabricated in a 180-nm process and operates under a six-phase nonoverlapping clock with a duty cycle of 16.7%. The measurement results show that in the tunable frequency range of 0.2–1.2 GHz, the filter achieves more than 32 dB of second and third harmonic rejections, a maximum of 55-dB out-of-band rejection, a bandwidth of 20–40 MHz, an in-band gain of 0–5 dB, and an in-band matching of

$S 11\lt -15$

dB. The in-band noise figure (NF) is 4.5–5.2 dB. As for linearity, the in-band P1dB is −2.8 to −0.9 dBm, and the out-of-band input third-order intercept point (OOB-IIP3) is +10.9 and +24.6 dBm at

$1\times $

BW and

$5\times $

BW, respectively. The entire filter consumes 12.6–23.4 mW of power with an area of 0.45 mm².

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一种改进谐波抑制和带外抑制的可调谐0.2 - 1.2 ghz n径带通滤波器

本文提出了一种新型的级联n径滤波器结构，以增强传统n径滤波器的带外抑制和谐波抑制。用于信号放大和噪声抑制的有源增益增强n路滤波器前端和带谐波抑制开关的无源n路滤波器后端提供高带外和谐波抑制，并增强级联后的线性度。该滤波器采用180nm工艺制造，工作在六相无重叠时钟下，占空比为16.7%。测量结果表明，在0.2 ~ 1.2 GHz的可调频率范围内，该滤波器实现了32 dB以上的二次和三次谐波抑制，最大带外抑制55 dB，带宽为20 ~ 40 MHz，带内增益为0 ~ 5 dB，带内匹配为$S 11\lt ~ 15$ dB。带内噪声系数（NF）为4.5 ~ 5.2 dB。线性度方面，带内P1dB为−2.8 ~−0.9 dBm，带外输入三阶截距点（OOB-IIP3）在$1\倍$ BW和$5\倍$ BW时分别为+10.9和+24.6 dBm。整个滤波器的功耗为12.6-23.4 mW，面积为0.45 mm2。

本文章由计算机程序翻译，如有差异，请以英文原文为准。

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来源期刊

IEEE Transactions on Microwave Theory and Techniques 工程技术-工程：电子与电气

CiteScore

8.60

自引率

18.60%

发文量

486

审稿时长

6 months

期刊介绍： The IEEE Transactions on Microwave Theory and Techniques focuses on that part of engineering and theory associated with microwave/millimeter-wave components, devices, circuits, and systems involving the generation, modulation, demodulation, control, transmission, and detection of microwave signals. This includes scientific, technical, and industrial, activities. Microwave theory and techniques relates to electromagnetic waves usually in the frequency region between a few MHz and a THz; other spectral regions and wave types are included within the scope of the Society whenever basic microwave theory and techniques can yield useful results. Generally, this occurs in the theory of wave propagation in structures with dimensions comparable to a wavelength, and in the related techniques for analysis and design.