7-MHz, 1.1-kW demonstration of the new E/F/sub 2,odd/ switching amplifier class

Kee, S.; Aoki, Ichiro; Rutledge, D.B.

doi:10.1109/mwsym.2001.967188

Cited by 26 publications

(18 citation statements)

References 6 publications

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“…The simulated DAT passive efficiency was 70.5%. This in combination with the active device efficiency of 67.5% (operating in fully saturated class mode [25]) and a compressed gain of 10 dB, result in a PAE of 43%. The predicted drain efficiency is around 48%.…”

Section: A Design Examplementioning

confidence: 99%

Distributed active transformer-a new power-combining and impedance-transformation technique

Aoki

Kee

Rutledge

et al. 2002

IEEE Trans. Microwave Theory Techn.

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395

218

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Abstract-In this paper, we compare the performance of the newly introduced distributed active transformer (DAT) structure to that of conventional on-chip impedance-transformations methods. Their fundamental power-efficiency limitations in the design of high-power fully integrated amplifiers in standard silicon process technologies are analyzed. The DAT is demonstrated to be an efficient impedance-transformation and power-combining method, which combines several low-voltage push-pull amplifiers in series by magnetic coupling. To demonstrate the validity of the new concept, a 2.4-GHz 1.9-W 2-V fully integrated power-amplifier achieving a power-added efficiency of 41% with 50-input and output matching has been fabricated using 0.35-m CMOS transistors.

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Section: A Design Examplementioning

confidence: 99%

Distributed active transformer-a new power-combining and impedance-transformation technique

Aoki

Kee

Rutledge

et al. 2002

IEEE Trans. Microwave Theory Techn.

Self Cite

395

218

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“…Since the higher order terms have negative coefficients, comparisons using this simplification underestimate efficiency differences between tunings. Under the optimal condition , this results in (19) This expression indicates that low rms to dc current ratios and low peak to dc voltage ratios are desirable. Similarly, a desirable FET device would have low on resistance relative to the squared breakdown voltage.…”

Section: Waveform Figures-of-meritmentioning

confidence: 97%

“…Since the peak to average ratio of a half-sinusoid is , the voltages are (40) At any given time, one switch is nonconducting and the chokes conduct only dc current , all currents except that of the conducting switch are known. Therefore, the switch current may be found by Kirchhoff's current law (KCL) (50) 4 Although the case presented here assumes a linear capacitance, the case of a nonlinear capacitance is also readily solved [19]. …”

Section: Push/pull Class-e/f and Class-amplifiersmentioning

confidence: 99%

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The class-E/F family of ZVS switching amplifiers

Kee

Aoki²,

Hajimiri

et al. 2003

IEEE Trans. Microwave Theory Techn.

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238

138

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Abstract-A new family of switching amplifiers, each member having some of the features of both class E and inverse F, is introduced. These class-E/F amplifiers have class-E features such as incorporation of the transistor parasitic capacitance into the circuit, exact truly switching time-domain solutions, and allowance for zero-voltage-switching operation. Additionally, some number of harmonics may be tuned in the fashion of inverse class F in order to achieve more desirable voltage and current waveforms for improved performance. Operational waveforms for several implementations are presented, and efficiency estimates are compared to class-E.

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“…The Class-E/F family has been proposed to take full advantage of both Class-E and Class-F -1 characteristics [5]. A 1.1-kW Class-E/F 2,odd PA was demonstrated at 7MHz with a drain efficiency of 85% [6].…”

Section: Introductionmentioning

confidence: 99%

A 2.7-kW, 29-MHz class-E/F/sub odd/ amplifier with a distributed active transformer

Jeon

Rutledge

2005

IEEE MTT-S International Microwave Symposium Digest, 2005.

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-A Class-E/F odd high power amplifier (PA) using the distributed active transformer (DAT) is demonstrated at 29MHz. The DAT combines the output power from four VDMOS push-pull pairs. The zero voltage switching (ZVS) condition is investigated and modified for the Class-E/F odd amplifier with a non-ideal output transformer. All lumped elements including the DAT and the transistor package are modeled and optimized to achieve the ZVS condition and the high drain efficiency. The PA exhibits 2.7kW output power with 79% drain efficiency and 18dB gain at 29MHz.

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7-MHz, 1.1-kW demonstration of the new E/F/sub 2,odd/ switching amplifier class

Cited by 26 publications

References 6 publications

Distributed active transformer-a new power-combining and impedance-transformation technique

Distributed active transformer-a new power-combining and impedance-transformation technique

The class-E/F family of ZVS switching amplifiers

A 2.7-kW, 29-MHz class-E/F/sub odd/ amplifier with a distributed active transformer

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