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2.4-GHz Tunable Miniature CMOS Active Bandpass Filter With Two Transmission Zeros Using Lumped Stepped-Impedance Ring Resonator
(2018-01-01)
Hsiao, Yu-Chih
;
Meng, Chinchun
;
Chien, Hsieh-Hsiu Chang
;
Huang, Guo-Wei
;
電機工程學系
This paper demonstrates a small-size 2.4-GHz CMOS active bandpass filter with two transmission zeros using a lumped stepped-impedance ring resonator. To obtain low insertion loss and small size, four high-Q active inductors using 0.18 gm CMOS transistors only are employed in the design. The measured insertion loss is 2.9-dB at 2.4 GHz center frequency with two transmission zeros located at 2.1 GHz and 3.1 GHz, respectively. By tuning the bias currents of active inductors, the center frequency has 1.4 GHz tuning range and the 1-dB bandwidth can be adjusted in the range of 190 MHz to 260 MHz. The demonstrated active filter occupies a small chip area of 0.47 mm x 0.33 mm excluding I/O pads and has 24 dB noise figure. Thus, an active filter with a preceding two-stage common-source LNA for suppression of noise of the active filter is also demonstrated and the resulting LNA + active filter has 6 dB noise figure. The power consumption of the active filter core and the LNA core is 9 mW and 7.2 mW, respectively.
Dual-Mode Dual-Band Ring Resonator Bandpass Filter With Transmission Zeros
(2010-01-01)
Kuo, Jen-Tsai
;
Lin, Tsu-Wei
;
電信工程研究所
;
Institute of Communications Engineering
Dual-mode dual-band bandpass filters are developed based on a single ring resonator. The ring is composed of two half-wave stepped-impedance resonators with short-circuited ends, which are connected to ground vias by short high-impedance sections, providing inductive coupling between the resonating modes and hence bandwidth control. Experimental filters are fabricated and measured for validation. Skew-symmetric feed structure is employed in the first circuit for enhancing the frequency selectivity around the second band. Source-load coupling is incorporated with the second design to create transmission zeros on both sides of the two passbands, greatly improving the performance in transition bands. The measured results show good agreement with the simulation.
Compact Microstrip Bandpass Filters Using Miniaturized Slow-Wave Quarter-Wavelength Resonators
(2010-01-01)
Chang, Wei-Shin
;
Liang, Cheng-Hsien
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
This paper proposes a novel lambda/4 microstrip slow wave resonator with interdigital capacitive fingers. The interdigital fingers provide a strong capacitive loading so as to miniaturize the resonator size. The resonant frequency is easily adjusted by varying the number of fingers and the spacing between fingers. To demonstrate the feasibility of the proposed structure, one four-pole Chebyshev and one four-pole generalized Chebyshev filter with 0.05 dB equal-ripple bandwidths of 7.5% and 5%, respectively, were designed and fabricated. An extra transmission zero can be close to the passband for high selectivity and stopband attenuation by using the proposed slow-wave resonator and the tapped input/output structure. Both filters are compact in size and exhibit good stopband rejection.
Compact Microstrip Bandpass Filters Using Miniaturized Quarter-Wavelength Resonators
(2010-01-01)
Liang, Cheng-Hsien
;
Chang, Wei-Shin
;
Chang, Chi-Yang
;
電信工程研究所
;
Institute of Communications Engineering
This paper proposes a novel miniaturized lambda/4 microstrip resonator. The two shorted high-impedance lines not only possess the feasibility to be arranged but also provide the strong magnetic coupling between resonators easily. By applying the proposed resonator, the filter with the flexible bandwidth can be realized. Moreover, the spurious frequency can be shifted to the higher frequency by adjusting the structural parameters. The proposed lambda/4 resonator has a much smaller size compared to the conventional one. Two four-pole bandpass filters were designed and fabricated to demonstrate the practicality of the proposed resonator. Each filter occupies a small circuit area and has a good stopband response.
2.4-GHz Q-Enhanced Lumped Ring Filter With Two Transmission Zeros Using 0.18-mu m SiGe BiCMOS Process
(2017-03-01)
Hsiao, Yu-Chih
;
Meng, Chinchun
;
Yang, Shih-Te
;
電機工程學系
;
Department of Electrical and Computer Engineering
A 2.4-GHz Q-enhanced lumped ring filter with a narrow bandpass response and two stopband-rejection transmission zeros using 0.18-mu m SiGe BiCMOS technology is demonstrated in this letter. A transformer-based Q-enhanced technique is employed to boost the Q-factor of on-chip inductors for low passband insertion loss. The measured results show zero dB insertion loss, 120-MHz 3-dB bandwidth for the passband centered at 2.45 GHz and with two transmission zeros at 2.35 and 2.65 GHz, respectively. The noise figure is about 14.5 dB, IP1dB is about -15.2 dBm and IIP3 is about -4.5 dBm, respectively. The total current consumption is 9.9 mA at 1.8 V supply voltage.
Ultra-Compact Shorted Ring Resonator Bandpass Filter With Wide Upper Stopband
(2014)
Lin, Tsu-Wei
;
Kuo, Jen-Tsai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
An ultra-compact second-order bandpass filter with stopband extension is implemented with shorted ring resonators. In the design, the two resonances of the structure are separately controlled by electric and magnetic coupling between the rings. Two transmission zeros on both sides of the passband are created through the multipath effect between the 1/0 ports. Circuit miniaturization is accomplished by attaching an open low-impedance stub to each shorted ring. The upper stopband with a rejection better than 30 dB is extended to 4.32 times the passband frequency. The circuit area is only 8.8% of that of a conventional dual-mode ring resonator filter. Measured results show good agreement with the simulation.
Design of cross-coupled quarter-wave SIR filters with plural transmission zeros
(2006)
Hsu, Ching-Luh
;
Kuo, Jen-Tsai
;
電信工程研究所
;
Institute of Communications Engineering
A cross-coupled bandpass filter is designed with quarter-wave stepped-impedance resonators (SIRS) on a single circuit plane. The entire circuit has not only a compact area since half-sized SIRS are used, but also a wide upper stopband because the first spurious peak occurs at a frequency much higher than the passband. Plural transmission zeros on both sides of the passband can be realized by non-adjacent couplings and tapped input/output. Two-port Z-parameters are employed to formulate the analysis of the transmission zeros. An experimental filter is fabricated and measured to validate the design.
New Miniaturized Ring Resonator Bandpass Filter With Wide Upper Stopband
(2013)
Lin, Tsu-Wei
;
Kuo, Jen-Tsai
;
Chung, Shyh-Jong
;
傳播研究所
;
Institute of Communication Studies
A new configuration for ring resonator is proposed for bandpass filter design with size reduction and stopband extension. The planar self-coupled ring is twisted at its middle and a short CPW section is implemented in the ground plane for the three-dimensional interconnection. The resonator has two resonance modes and the filter possesses one transmission zero on the high side of the passband. With a pair of open low-impedance stubs attached to the ring, the circuit has an area of only 9.65% of that of the conventional ring resonator filter, and the upper stopband is extended up to higher than five times the center frequency. Measured results of a fabricated prototype circuit show good agreement with the simulation.
Filtering Rat-Race Coupler With Transmission Zeros Using Compact Miniaturized Hairpin Resonators
(2015)
Lin, Tsu-Wei
;
Wu, Jen-Yi
;
Kuo, Jen-Tsai
;
傳播研究所
;
Institute of Communication Studies
A new compact filtering rat-race coupler is implemented by a 2x2 cross coupled configuration based on compact miniaturized hairpin resonators. Passband responses with transmission zeros are synthesized by an (n+4)x(n+4) coupling matrix. The zeros are created in the output ports by adding source-load coupling and their analytical expressions are derived. An experimental circuit is fabricated and measured. The circuit area is only 23.2% of that of a conventional rat-race coupler. Measured magnitude and phase responses of the four-port S-parameters show good agreement with simulation data.
高品質無線通訊雙頻操作被動元件之研發(I)
(2007)
郭仁財
;
KUO JEN-TSAI
;
國立交通大學電信工程學系(所)
本計畫第一年 (2007/08~2008/07) 探討如何設計具有多重傳輸零點、寬截止帶、以及高階微小化的雙頻帶濾波器。我們先前的研究結果顯示，當雙頻帶濾波器的階數增加時，可實現的頻寬範圍會變小。因此，期望發展具有橢圓函數響應的雙頻帶濾波器。如此將可無需增加階數，也能改善通帶的選擇度。同時，適當地安排傳輸零點的頻率也可用來抑制高階膺頻，增加高止帶的頻寬。計畫中使用新型的堆疊式步階阻抗諧振腔濾波器設計雙頻帶濾波器。初步的分析顯示，若利用斜對稱平行耦合線饋入，即可在兩個通帶的兩側產生零點。研究發現必須適當地選擇耦合線的長度以及間距，才能在兩個通帶都得到良好的折返損失。在初步的實驗中，只需要使用二個步階阻抗諧振腔，即可設計出橢圓函數響應的雙頻帶濾波器。這比我們之前須使用四個步階阻抗諧振腔的設計更小也更簡易。此外，如何利用傳輸零點抑制高階膺頻的方案也將在此計劃中研究。本計畫第二年 (2008/08~2009/07) 研究具有雙頻帶操作的方向耦合器（90o 與 180o 分合波器）及其微小化設計。先將 180o 分合波環周邊以步階阻抗傳輸線取代，以達到微小化與骯頻操作的目的。每一段 λ/4 週邊均以兩段低阻抗及一段高阻抗傳輸線段串接之傳輸線電路取代，所得之分合波器所佔用面積為傳統設計之 49％，初步研究成果中以操作於 900/1800 MHz 雙頻電路之實作與量測為例。在進一步的成果中，利用步階阻抗傳輸線並接開路殘段，取代標準設計結構中四分之波長傳輸線段。步階阻抗傳輸線段以及並接殘段的特性阻抗與長度等幾何參數，均需先由理論推導出相關公式，再將以繪圖或解非線性方程式得到。在初步成果中，如果只使用開路殘段而不使用步階阻抗，所設計的雙頻帶180o 耦合器，其周長只有傳統單頻帶設計的32%。如果進一步使用步階阻抗，環的周長更可達傳統單頻帶設計的25%以內，實作電路之測量頻率響應與設計模擬相當一致。在本計劃中，亦將利用上述方法設計微小化的雙頻直交（90o）耦合器。具有抑制高階諧波，以達到寬截止帶，並兼具雙頻與微小化的設計將一併研究。

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