High-Efficiency Power Amplifier Using Novel Dynamic Bias Switching

Jeon, Young-Sang; Cha, JuKyung; Nam, Sangwook

doi:10.1109/tmtt.2007.892804

Cited by 17 publications

(6 citation statements)

References 10 publications

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“…To improve the average efficiency of the PAs, various methods have been pursued . Bias modulation techniques are very straightforward efficiency enhancement methods.…”

Section: Introductionmentioning

confidence: 99%

“…Discrete bias control method (dynamic bias switching or DBS) is one of the alternative methods to increase the average efficiency of the PA. It dynamically provides multilevel (mostly two‐level) bias voltages to the drain or collector of the PA according to the amplitude of the envelope signal . For the two‐level DBS, if the envelope signal is lower than the threshold voltage, a low bias voltage is applied to the drain or collector of the PA.…”

Section: Introductionmentioning

confidence: 99%

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Efficiency enhanced CMOS digitally controlled dynamic bias switching power amplifier for LTE

Kim¹,

Bae

Ham³

et al. 2015

Micro & Optical Tech Letters

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This article presents an efficiency enhanced CMOS power amplifier using a digitally controlled dynamic bias switching method. It is composed of a dynamic bias switching circuit and a power amplifier circuit. The control signal for bias switching operation is generated by the digital signal processing unit according to the amplitude of the envelope signal. Then, the dynamic bias switching circuit offers two different supply voltages to the drain of the power amplifier. The low supply voltage is generated by a DC–DC converter within the dynamic bias switching circuit, while the high voltage can be directly supplied by the battery. The threshold voltage for the envelope signal and the low supply voltage level were analytically optimized for maximum efficiency enhancement using the envelope statistics of the LTE signal. The gain difference between low and high bias voltage conditions was compensated for better linearity of the power amplifier. The proposed dynamic bias and power amplifier IC's were designed and fabricated using 0.18 μm CMOS process. The fabricated CMOS power amplifier IC using the dynamic bias switching method was evaluated using a 64 QAM LTE up‐link signal which has a center frequency of 1.75 GHz, a signal bandwidth of 5 MHz, and a peak‐to‐average power ratio of 7.76 dB. It exhibited a power‐added efficiency of 39.3% and an error vector magnitude of 4.6% at an average output power of 22 dBm, while the stand‐alone CMOS power amplifier has an efficiency of 34.5%. © 2015 Wiley Periodicals, Inc. Microwave Opt Technol Lett 57:2315–2321, 2015

show abstract

“…To improve the average efficiency of the PAs, various methods have been pursued . Bias modulation techniques are very straightforward efficiency enhancement methods.…”

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Efficiency enhanced CMOS digitally controlled dynamic bias switching power amplifier for LTE

Kim¹,

Bae

Ham³

et al. 2015

Micro & Optical Tech Letters

View full text Add to dashboard Cite

show abstract

“…Class AB operation mode is a good compromise to meet these kinds of requirements for wireless power amplifiers and the conduction angle in Class AB PAs is a very important design parameter since the efficiency and the linearity are a strong function of the conduction angle, or device current at quiescent condition without RF signals [2]. Therefore, many papers have been published for designing the bias circuits in order to get higher efficiency and better linearity [3,4,5].…”

Section: Introductionmentioning

confidence: 99%

Effect of bias circuits on receiver band noise of GaAs HBT power amplifiers

Kim

Lee

2010

IEICE Electron. Express

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This paper presents the effect of different bias circuits configurations on the noise performance of GaAs HBT (heterojunction bipolar transistor) power amplifiers at the receiver band. Various bias circuits have been used for the power amplifier in an WCDMA (wideband code division multiple access) transmitter module including the output duplexer at PCS band (Tx: 1850 ∼ 1910 MHz, Rx: 1930 ∼ 1990. A bias circuit with cascode current mirrors for the 1 st and the 2 nd stages shows less than −180 dBm/Hz receiver band noise with −39 dBc of ACPR (adjacent channel power ratio) at 25.2 dBm antenna output power.

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“…To improve the average efficiency of the PAs, various methods have been pursued [3][4][5][6][7][8][9][10][11][12][13][14][15][16][17][18][19][20][21]. Bias modulation techniques are very straightforward efficiency enhancement methods.…”

Section: Introductionmentioning

confidence: 99%

“…Discrete bias control method (dynamic bias switching or DBS) is one of the alternative methods to increase the average efficiency of the PA. It dynamically provides multilevel (mostly two-level) bias voltages to the drain or collector of the PA according to the amplitude of the envelope signal [18][19][20][21]. For the two-level DBS, if the envelope signal is lower than the threshold voltage, a low bias voltage is applied to the drain or collector of the PA.…”

Section: Introductionmentioning

confidence: 99%