High-efficiency L-band Kahn-technique transmitter

Raab, Frederick H.; Sigmon, B.E.; Myers, R.G.; Jackson, R.

doi:10.1109/mwsym.1998.705061

Cited by 12 publications

(5 citation statements)

References 6 publications

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“…In most practical designs, this is done by adding two fixed shunt susceptances to the branches [see also Fig. 2(b)], given by (4) where is (5) with being the phase angle for which pure ohmic loading is established. When we assume that the active devices are operating in saturated class-B mode, they tend to behave as voltage sources [2].…”

Section: Outphasing Amplifier Optimizationmentioning

confidence: 99%

A 90-W Peak Power GaN Outphasing Amplifier With Optimum Input Signal Conditioning

Qureshi

Pelk

Marchetti

et al. 2009

IEEE Trans. Microwave Theory Techn.

116

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Abstract-A 90-W peak-power 2.14-GHz improved GaN outphasing amplifier with 50.5% average efficiency for wideband code division multiple access (W-CDMA) signals is presented. Independent control of the branch amplifiers by two in-phase/quadrature modulators enables optimum outphasing and input power leveling, yielding significant improvements in gain, efficiency, and linearity. In deep-power backoff operation, the outphasing angle of the branch amplifiers is kept constant below a certain power level. This results in class-B operation for the very low output power levels, yielding less reactive loading of the output stages, and therefore, improved efficiency in power backoff operation compared to the classical outphasing amplifiers. Based on these principles, the optimum design parameters and input signal conditioning are discussed. The resulting theoretical maximum achievable average efficiency for W-CDMA signals is presented. Experimental results support the foregoing theory and show high efficiency over a large bandwidth, while meeting the linearity specifications using low-cost low-complexity memoryless pre-distortion. These properties make this amplifier concept an interesting candidate for future multiband base-station implementations.Index Terms-Base station, high-efficiency RF power amplifier, mixed-mode amplifier, outphasing amplifier, wideband code division multiple access (W-CDMA).

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Section: Outphasing Amplifier Optimizationmentioning

confidence: 99%

A 90-W Peak Power GaN Outphasing Amplifier With Optimum Input Signal Conditioning

Qureshi

Pelk

Marchetti

et al. 2009

IEEE Trans. Microwave Theory Techn.

116

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“…Figure 12.9 shows the principles of traditional EER and ET systems. EER uses a combination of a high-efficiency switched-mode PA with an envelope remodulation circuit [7][8][9][10][11]; ET utilizes a linear PA and a controlled supply voltage, which closely tracks the output envelope. When the supply voltage tracks the instantaneous output envelope, it is known as wide-bandwidth ET (WBET) [12][13][14][15]; when the supply voltage tracks the long-term average of the output envelope, it is known as average ET (AET) [16,17].…”

Section: Dynamic Power Supply Variation Using Envelope Tracking/envelmentioning

confidence: 99%

Linearity and Efficiency Strategies for Next‐Generation Wireless Communications

Hueber

Staszewski

2010

Multi‐Mode/Multi‐Band RF Transceivers for Wireless Communications

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“…Figure 3 shows the principles of traditional EER and ET systems. EER uses a combination of a high efficiency switched-mode PA with an envelope re-modulation circuit [11][12][13][14][15]; ET utilizes a linear PA and a controlled supply voltage, which closely tracks the output envelope. When the supply voltage tracks the instantaneous output envelope, it is known as Wide Bandwidth ET (WBET) [16][17][18][19]; when the supply voltage tracks the long-term average of the output envelope, it is known as Average ET (AET) [20,21].…”

Section: Power Efficiency Enhancement Strategiesmentioning

confidence: 99%

Linearity and efficiency enhancement strategies for 4G wireless power amplifier designs

Larson

Kimball

Asbeck

2008

2008 IEEE Custom Integrated Circuits Conference

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Next generation wireless transmitters will rely on highly integrated silicon-based solutions to realize the cost and performance goals of the 4G market. This will require increased use of digital compensation techniques and innovative circuit approaches to maximize power and efficiency and minimize linearity degradation. This paper summarizes the circuit and system strategies being developed to meet these aggressive performance goals.

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High-efficiency L-band Kahn-technique transmitter

Cited by 12 publications

References 6 publications

A 90-W Peak Power GaN Outphasing Amplifier With Optimum Input Signal Conditioning

A 90-W Peak Power GaN Outphasing Amplifier With Optimum Input Signal Conditioning

Linearity and Efficiency Strategies for Next‐Generation Wireless Communications

Linearity and efficiency enhancement strategies for 4G wireless power amplifier designs

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