High-Selectivity Single-Ended/Balanced DC-Block Filtering Impedance Transformer and Its Application on Power Amplifier

Zhuang, Zheng; Wu, Yongle; Kong, Mengdan; Wang, Weimin

doi:10.1109/tcsi.2020.3015883

Cited by 29 publications

(13 citation statements)

References 32 publications

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“…The performance comparison of the proposed IT with previously reported works is shown in Table 3. As observed from this table, the proposed IT provides bandpass filtering response as well as center‐frequency tunability capability, which was not possible in previously reported works 8–23 …”

Section: Simulation and Measurement Resultsmentioning

confidence: 76%

“…As observed from this table, the proposed IT provides bandpass filtering response as well as center-frequency tunability capability, which was not possible in previously reported works. [8][9][10][11][12][13][14][15][16][17][18][19][20][21][22][23]…”

Section: Simulation and Measurement Resultsmentioning

confidence: 99%

“…In References 14,15, ITs with enhanced impedance transforming ratio and wide out‐of‐band suppression are demonstrated. Using multi‐section coupled line and modified coupled line, the wideband ITs are presented in References 16–18. In References 19–21, ITs with extremely low or high impedance transforming are presented.…”

Section: Introductionmentioning

confidence: 99%

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A design of impedance transformer with tunable center frequencies using filter synthesis approach

Chaudhary

Jeong

2022

Int J RF Mic Comp-Aid Eng

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Microwave impedance transformer (IT) with center frequency tunable capability is one of great research issue for better utilization of frequency spectrum resources and system miniaturization of next generation wireless communication systems. This article presents a filter synthesis approach for designing IT with center frequency tunable capability using single dc-bias controlled tunable resonators. The proposed IT provides bandpass filtering response and is designed by properly coupling quarter-wave tunable resonators with alternate J-and K-inverters. The J-inverters are realized using a parallel-coupled line, whereas K-inverter is implemented with T-type short-circuited TL. Using filter theory, analytical design equations are derived to calculate the circuit parameters. The center frequency of the proposed IT is tuned over a wide frequency tuning range (FTR) by changing the varactor diode capacitance of quarterwave resonators. For experimental demonstration, a prototype of 25-to-50 Ω IT is designed, simulated, and measured. The measured results confirmed that the center frequency of the proposed IT is tuned from 2.05 to 2.91 GHz (860 MHz or 34.68% FTR) with an insertion loss variation of 2.57 to 1.76 dB.

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Section: Simulation and Measurement Resultsmentioning

confidence: 76%

Section: Simulation and Measurement Resultsmentioning

confidence: 99%

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A design of impedance transformer with tunable center frequencies using filter synthesis approach

Chaudhary

Jeong

2022

Int J RF Mic Comp-Aid Eng

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“…In addition, terminated coupled line is also confirmed to be effective in the bandpass filtering PA design [16]. Although the filtering PAs in [17] and [18] have expanded the bandwidths at around 3.5 GHz, they are not able to fully cover the N78 frequency band of 3.3-3.8 GHz for 5G application. The above structures based on couple lines may suffer larger loss and are not easy to tune in measurement to some extent.…”

Section: Introductionmentioning

confidence: 98%

“…Digital Object Identifier 10.1109/TCSI.2022.3217798 [14], [15], [16], [17], [18]. High quality factor cavity resonator [7] and dielectric resonator (DR) [8] are used in the output matching networks (OMNs) of class-F PAs to achieve good roll-off performance.…”

Section: Introductionmentioning

confidence: 99%

Highly Efficient Filtering Power Amplifier Using Impedance Area-Based Optimization

Zhan

Xue

2023

IEEE Trans. Circuits Syst. I

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This paper presents an optimization method of wideband filtering power amplifier (PA) with high efficiency. In order to achieve the expected high efficiency in the wide passband and reduce design difficulty, a high-performance area-based impedance target for computer-aided automatic optimization is proposed, which avoids the unexpected efficiency degradation caused by the conventional impedance target. In the meanwhile, the out-of-band optimization target described by impedance is also proposed to obtain bandpass filtering characteristic. The in-band and out-of-band optimization targets are utilized to design the output matching network to realize fundamental and harmonic impedance matching precisely, as well as the filtering response. For demonstration, a filtering PA operating in 3.3-3.8 GHz is implemented and measured. The measured small-signal S-parameter exhibits flat gain in passband and good bandpass filtering response. The measured power-added efficiency (PAE) is larger than 62% within the entire working band and the highest PAE is 71.7%.

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A broadband continuous class‐B/J power amplifier with novel output matching network

Cai,

Yao,

Liu

et al. 2024

Circuit Theory & Apps

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This paper presents a broadband continuous class‐B/J power amplifier (PA) based on a novel output matching network (OMN). In order to realize a compact and broadband OMN design, a multiband harmonic control network (MHCN) with a simple structure consisting of a combination of open‐circuited stubs and a microstrip radial stub (MRS) is designed, which is capable of tuning the second harmonic impedance at the upper and lower sideband frequencies and at the center frequency well and consumes low power. Also, a fundamental matching network (FMN) is designed by means of the simplified real frequency technique (SRFT) algorithm of the computer‐aided program, which improves the efficiency of the circuit design. Both of them satisfy the requirements of a wideband PA and enhance the frequency‐selective performance of the OMN. For validation purposes, practical measurements of the designed and fabricated continuous class‐B/J PA with size of 61 × 51 mm2 have been carried out. The results show that at an operating frequency of 2.4–4.4 GHz, the 53%–73% drain efficiency (DE) at the output power of 38.4–42.4 dBm, and the maximum gain is 13.3 dB.

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High-Selectivity Single-Ended/Balanced DC-Block Filtering Impedance Transformer and Its Application on Power Amplifier

Cited by 29 publications

References 32 publications

A design of impedance transformer with tunable center frequencies using filter synthesis approach

A design of impedance transformer with tunable center frequencies using filter synthesis approach

Highly Efficient Filtering Power Amplifier Using Impedance Area-Based Optimization

A broadband continuous class‐B/J power amplifier with novel output matching network

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