RF power amplifier employing a frequency-tunable impedance matching network based on coupled inductors

Fabbro, Paulo Augusto Dal; Kayal, Maher

doi:10.1049/el:20089196

Cited by 6 publications

(5 citation statements)

References 1 publication

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“…In addition, the negative value for these distances of stability also indicates the microwave amplifier resides in an unstable region. This stability, µ can be determined by using (7), whiles the Rollet's stability, K is given in (8) and (9).…”

Section: Implementation Of the Homogeneous Dielectric Resonator On Mi...mentioning

confidence: 99%

“…Although, it depends on the specific circuit requirements such as the simplicity in practical realization, the frequency bandwidth, the least noise figure, design implementation and adaptability, stable operations conditions, and linearity. Thus, many types of stability and matching networks are available [1][2][3][4][5], which include lumped element [5], transmission lines [6], and variable matching network [7][8][9][10][11]. The qualitative summary of the stability and matching techniques for microwave amplifier of the earlier research done are listed and summarized in Table 1.…”

Section: Introductionmentioning

confidence: 99%

“…• A useful option for CMOS design when low-Q inductors must be used. [9] Narrowband tunable impedance-matching (πstructure with varactors in series with inductors)…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

Cylindrical Dielectric Resonator as Dielectric Matching on Microwave Amplifier for the Unconditionally Stable and Conditionally Stable Transistor at 5 GHz Frequency

Yob

Mahyuddin

Ain

et al. 2022

ARASET

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Stability and matching techniques on microwave amplifier have been an important consideration to maintain their required performances, but typically its frequency dependent. Thus, a frequency variable mechanism is required. The dielectric matching employing the stability and matching techniques on microwave amplifier with cylindrical dielectric resonator has been investigated and realized. The cylindrical dielectric resonator (CDR) with parallel microstrip lines is proposed at 5 GHz frequency for unconditionally stable and conditionally stable transistor as dielectric matching. Hence, the proposed dielectric resonator with +2 mm spacing and 155˚ of curved configuration indicated the best performances for preliminary study. The result improves the performance of the parallel inhomogeneous CDR by 9.77%. Subsequently, the homogeneous CDR is also successfully working as the variable frequency mechanism for unconditionally stable and conditionally stable transistor at 5 GHz frequency in maintaining their stability performances.

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Section: Implementation Of the Homogeneous Dielectric Resonator On Mi...mentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

Cylindrical Dielectric Resonator as Dielectric Matching on Microwave Amplifier for the Unconditionally Stable and Conditionally Stable Transistor at 5 GHz Frequency

Yob

Mahyuddin

Ain

et al. 2022

ARASET

View full text Add to dashboard Cite

show abstract

“…Several studies have been done on common or tunable impedance transformers for real and complex loads. As in Reference , coupled inductors can be used as tunable inductances in the RF power amplifier design in the output impedance matching network to improve the output power efficiency. Reference shows a complete design and measurement of the tunable impedance transformer.…”

Section: Introductionmentioning

confidence: 99%

A simple filtering lumped impedance transformer with controllable center frequency and bandwidth for complex load

Lan

Guo

Ding

2019

Micro & Optical Tech Letters

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A simple complex impedance transformer with tunable center frequency and bandwidth that feature bandpass filtering capability for the operative band is proposed in this article. The basic principle of this design is the utilization of resonators, which can introduce transmission poles and zeros into the response. Thus, by controlling the resonant frequency through varactors, the desired function is obtained. The tuning range of the center frequency is 300 to 600 MHz and the bandwidth is 40 to 80 MHz and 80 to 130 MHz at its lower cutoff frequency (means that the left edge of passband keeps stable) and upper cutoff frequency (means that the right edge of passband keeps stable), respectively. Good agreement can be observed between simulated and measured results.

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“…The branch-line coupler and coupled-line coupler are two common examples of distributed quadrature couplers [1]. A coupled inductors coupler is a discrete circuit and it is commonly used in analogue integrated circuits [2,3]. Strong coupling between the two inductors is required and has to be quantified.…”

mentioning

confidence: 99%

High‐frequency wideband quadrature coupler using transformer and lumped elements

2014

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A lumped quadrature coupler based on a ferromagnetic core is proposed for high-frequency (HF) application. The four terminals of the transformer are connected to the four ports, whereas two inductors and two capacitors are connected between two adjacent ports. The bandwidth is only limited by magnitude imbalance. A 13.56 MHz prototype is designed and tested. A 69% bandwidth is achieved with ±3 dB magnitude imbalance. Within the frequency band, the measured return loss is greater than 31.57 dB, port-to-port isolation is greater than 33.21 dB and the phase imbalance is <2°.

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RF power amplifier employing a frequency-tunable impedance matching network based on coupled inductors

Cited by 6 publications

References 1 publication

Cylindrical Dielectric Resonator as Dielectric Matching on Microwave Amplifier for the Unconditionally Stable and Conditionally Stable Transistor at 5 GHz Frequency

Cylindrical Dielectric Resonator as Dielectric Matching on Microwave Amplifier for the Unconditionally Stable and Conditionally Stable Transistor at 5 GHz Frequency

A simple filtering lumped impedance transformer with controllable center frequency and bandwidth for complex load

High‐frequency wideband quadrature coupler using transformer and lumped elements

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