Controlling Active Load–Pull in a Dual-Input Inverse Load Modulated Doherty Architecture

Hone, Thomas M.; Bensmida, S.; Morris, Kevin; Beach, M.A.; McGeehan, JP; Lees, Jonathan; Benedikt, J.; Tasker, P.J.

doi:10.1109/tmtt.2012.2190748

Cited by 16 publications

(11 citation statements)

References 17 publications

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“…The fifth order polynomial function of S 11 's modulus with vertical depth (y) as independent variable is given by (4). variable is given by (5).…”

Section: Measurement and Calibrationmentioning

confidence: 99%

“…Substituting them into (7), we can get λ g = 11.806 mm. Then according to (4), (5) and (6), the scattering parameter S 11 at 33 GHz with probe at any position can be obtained. Modulus and phase of S 11 (x = 6 mm) are shown in Figures 14 and 15 respectively.…”

Section: Measurement and Calibrationmentioning

confidence: 99%

“…Therefore, it is more and more important for accurate measurements of the parameters, especially, in high-power state. The traditional test method is to measure the scattering parameters of high-power devices in small signal with the vector network analyzer (VNA) and to calculate the scattering parameters in large signal [1][2][3][4]. And it has low precision and efficiency.…”

Section: Introductionmentioning

confidence: 99%

See 2 more Smart Citations

A New Type of High-Power Microwave Impedance Tuner Based on Load-Pull With a Rapid Calibration Method

Cheng¹,

Sun²,

Wang³

et al. 2014

PIER C

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Abstract-For the measurement of microwave device in high-power, traditional methods are inefficient, inaccurate and not on-line real-time measurement. A new type of high-power microwave impedance tuner (26.5 GHz ∼ 40 GHz) based on load-pull technique and a corresponding rapid calibration method based on curve fitting are proposed. A new structure using increased width rectangular waveguide slotted in the center is adopted as the main transmission line. In order to prevent the leak of electromagnetic waves transferring in rectangular waveguide, two choke grooves are added in upper cover plate of the waveguide cavity. The results (standing wave ratio range of 1.02 ∼ 10.98, insertion loss of 0.063 dB at minimum standing wave ratio) show by practical measurement that this structure and method are feasible. The device can meet the requirement of design, and the new method has less time for calibration.

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“…The fifth order polynomial function of S 11 's modulus with vertical depth (y) as independent variable is given by (4). variable is given by (5).…”

Section: Measurement and Calibrationmentioning

confidence: 99%

Section: Measurement and Calibrationmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

See 1 more Smart Citation

A New Type of High-Power Microwave Impedance Tuner Based on Load-Pull With a Rapid Calibration Method

Cheng¹,

Sun²,

Wang³

et al. 2014

PIER C

View full text Add to dashboard Cite

show abstract

“…This is not always viable for large output power devices. The inverse Doherty PA is capable of reducing the peaking amplifier size while maintaining the benefits of conventional Doherty [3]. The work presented in this paper will build on the advantages of the inverse Doherty PA and will present a topology where the peaking amplifier has its drain supply voltage reduced to emulate a smaller device such that the efficiency at output power back-off is further enhanced.…”

Section: Introductionmentioning

confidence: 99%

“…The impedance seen at plane β, ܴ ᇱ , can be expressed in terms of the voltage ܸ and ‫ܫ‬ (2). By substituting (1) into (2), an expression for ܴ ᇱ can be obtained (3). It shows that the value of ܴ ᇱ can be increased or decreased depending on the magnitude and phase of ‫ܫ‬ with respect to ‫ܫ‬ .…”

Section: Introductionmentioning

confidence: 99%

The inverse Doherty amplifier using a reduced peaking amplifier drain supply voltage

Hone

Bensmida

Morris

et al. 2012

2012 IEEE International Conference on Wireless Information Technology and Systems (ICWITS)

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Extending high‐efficiency power range of symmetrical Doherty power amplifiers by taking advantage of peaking stage

Shi

Naah

2017

IET Microwaves, Antennas & Propagation

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In this study, a methodology is proposed for extending the high‐efficiency power range (HEPR) of symmetrical Doherty power amplifiers (DPAs). This method takes advantage of the output impedance of peaking stage. Traditional symmetrical DPAs maintain high efficiency over a 6 dB power range with an assumption of the output impedance of peaking stage being infinity. This study reveals that the HEPR can be further enhanced by tuning the output impedance of peaking stage away from infinity and changing the phase delay of the impedance inverter after carrier power amplifier. A 2.2–2.3 GHz symmetrical DPA with an HEPR of 9 dB is fabricated to validate our theory. The experimental results possess drain efficiencies of 45.3–49.5% at 9 dB output power back‐off level and 62.9–71% at peaking power level over 2.2–2.3 GHz. The maximum output power of the fabricated DPA is 45 dBm with a gain of 11.6–13.5 dB across 2.2–2.3 GHz.

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Controlling Active Load–Pull in a Dual-Input Inverse Load Modulated Doherty Architecture

Cited by 16 publications

References 17 publications

A New Type of High-Power Microwave Impedance Tuner Based on Load-Pull With a Rapid Calibration Method

A New Type of High-Power Microwave Impedance Tuner Based on Load-Pull With a Rapid Calibration Method

The inverse Doherty amplifier using a reduced peaking amplifier drain supply voltage

Extending high‐efficiency power range of symmetrical Doherty power amplifiers by taking advantage of peaking stage

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