Design of variable-resistance class E inverters for load modulation

Rosłaniec, Łukasz; Perreault, David J.

doi:10.1109/ecce.2012.6342344

Cited by 25 publications

(14 citation statements)

References 23 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…modulation under outphasing is similar in some regards to the load modulation effect in Doherty amplifiers, albeit realized through phase-shift control of saturated branch PAs rather than RF drive amplitude control.) For appropriately-designed branch PAs (e.g., [6], [37], [38], [40], [41]), high branch PA efficiency can be maintained across a wide range of resistive load impedances, yielding high overall efficiency under modulated conditions. Outphasing with lossless combining using switched-mode branch PAs may have the potential for the highest overall efficiency in modulated power amplifier systems.…”

Section: Introductionmentioning

confidence: 99%

Four-Way Microstrip-Based Power Combining for Microwave Outphasing Power Amplifiers

Barton

Perreault

2014

IEEE Trans. Circuits Syst. I

Self Cite

View full text Add to dashboard Cite

Abstract-A lossless multi-way outphasing and power combining system for microwave power amplification is presented. The architecture addresses one of the primary drawbacks of Chireix outphasing; namely, the sub-optimal loading conditions for the branch power amplifiers. In the proposed system, four saturated power amplifiers interact through a lossless power combining network to produce nearly resistive load modulation over a 10:1 range of output powers. This work focuses on two microstrip-based power combiner implementations: a hybrid microstrip/discrete implementation using a combination of microstrip transmission line sections with discrete shunt elements, and an all-microstrip implementation incorporating open-circuited radial stubs. We demonstrate and compare these techniques in a 2.14 GHz power amplifier system. With the allmicrostrip implementation, the system demonstrates a peak CW drain efficiency of 70% and drain efficiency of over 60% over a 6.5-dB outphasing output power range with a peak power of over 100 W. We demonstrate W-CDMA modulation with 55.6% average modulated efficiency at 14.1 W average output power for a 9.15-dB peak to average power ratio (PAPR) signal. The performance of this all-microstrip system is compared to that of the proposed hybrid microstrip/discrete version and a previously reported implementation in discrete lumped-element form.Index Terms-base stations, outphasing, power amplifier (PA), wideband code division multiple access (W-CDMA), Chireix, LINC, load modulation.

show abstract

Section: Introductionmentioning

confidence: 99%

Four-Way Microstrip-Based Power Combining for Microwave Outphasing Power Amplifiers

Barton

Perreault

2014

IEEE Trans. Circuits Syst. I

Self Cite

View full text Add to dashboard Cite

show abstract

“…Output power The two inverters are designed to be identical and based on the methodology described in [22], but without the parallel resonant tank. The values of the input inductors, L I1 and L I2 , and the switch capacitances, C S1 and C S2 , are given by the equations:…”

Section: Input Voltagementioning

confidence: 99%

Outphasing control of gallium nitride based very high frequency resonant converters

Madsen

Knott

Andersen

et al. 2015

2015 IEEE 16th Workshop on Control and Modeling for Power Electronics (COMPEL)

Self Cite

View full text Add to dashboard Cite

1 Abstract -In this paper an outphasing modulation control method suitable for line regulation of very high frequency resonant converters is described.The pros and cons of several control methods suitable for very high frequency resonant converters are described and compared to outphasing modulation. Then the modulation technique is described and the design equations given.Finally a design example is given for a converter consisting of two class E inverters with a lossless combiner and a common half bridge rectifier. It is shown how outphasing modulation can be used for line regulation while insuring equal and purely resistive loading of the inverters. Combined with a proper design of the inverters that, insures they can achieve zero voltage switching across a wide load range, and gallium nitride FETs for the switching devices, this makes it possible to achieve more than 90% efficiency across most of the input voltage range with good line regulation.

show abstract

“…In the proposed design the rectifier input series resonant tank is tuned on resonance at the desired operating frequency, with a sufficiently high loaded quality factor that the input current is substantially sinusoidal. This is similar to the design of class E inverters for variable-load operation as described in [10]. Hence, for analysis the input source will be assumed to be of the form ( ) where is the amplitude of the input current, its angular frequency and its phase.…”

Section: Class E Rectifier Operation and Analysismentioning

confidence: 99%

Design of resistive-input class E resonant rectifiers for variable-power operation

Santiago-González

Afridi

Perreault

2013

2013 IEEE 14th Workshop on Control and Modeling for Power Electronics (COMPEL)

Self Cite

View full text Add to dashboard Cite

Abstract-Resonantrectifiers have important application in very-high-frequency power conversion systems, including dc-dc converters, wireless power transfer systems, and energy recovery circuits for radio-frequency systems. In many of these applications, it is desirable for the rectifier to appear as a resistor at its ac input port. However, for a given dc output voltage, the input impedance of a resonant rectifier varies in magnitude and phase as output power changes. A design method is introduced for realizing single-diode "shunt-loaded" resonant rectifiers, or class E rectifiers, that provide near-resistive input impedance over a wide range of output power levels. The proposed methodology is demonstrated in simulation for a 10:1 power range.

show abstract

Design of variable-resistance class E inverters for load modulation

Cited by 25 publications

References 23 publications

Four-Way Microstrip-Based Power Combining for Microwave Outphasing Power Amplifiers

Four-Way Microstrip-Based Power Combining for Microwave Outphasing Power Amplifiers

Outphasing control of gallium nitride based very high frequency resonant converters

Design of resistive-input class E resonant rectifiers for variable-power operation

Contact Info

Product

Resources

About