Efficiency enhancement for power amplifiers using dynamic bias switching technique

Van, Ju-ho; Jung, Sunghoon; Park, H.; Kim, M.; Cho, H.; Jeong, Ju Seon; Kwon, Seunglee; Lim, Kyung Taek; Yang, Youngoo

doi:10.1049/el:20080070

Cited by 12 publications

(7 citation statements)

References 2 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

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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%

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

“…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%

Dual band patch antenna based on complementary rectangular split-ring resonators

Ortiz

Falcone

Sorolla

2009

2009 Asia Pacific Microwave Conference

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“…DBS(Dynamic Bias Switching)는 ET와 유사한 동작원리 를 가지는 bias modulation 기술이다. 그러나 ET가 연속되 는 드레인 전압을 사용하는데 반해 2단계의 레벨을 갖는 전압을 교차 스위칭함으로써 전력 증폭기에 DC 전력을 공급해 주는 방법을 사용한다 [13]～ [15] . DDBS(Digitally-controlled Dynamic Bias Switching)는 DBS 와 똑같은 동작 특성을 갖지만, 입력 신호의 크기에 따라 두 단계의 레벨을 갖는 제어 신호를 디지털로 처리하여 구성이 간단하고 제어가 용이하다는 장점을 가진다 [16] .…”

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Efficiency Improvement of Power Amplifier Using a Digitally-Controlled Dynamic Bias Switching for LTE Base Station

Seo¹,

Lee²,

Park

et al. 2014

The Journal of Korean Institute of Electromagnetic Engineering

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This paper presents an efficiency enhancement for the high power amplifier using DDBS(Digitally-controlled Dynamic Bias Switching) method which dynamically provides the power amplifier with two bias voltage levels according to the input envelope signal. It is quite easy to adjust the control signal by using a digital processing. The fabricated DDBS PA was evaluated using an 64 QAM FDD LTE signal, which has a center frequency of 2.6 GHz, a bandwidth of 10 MHz and a PAPR of 9.5 dB. The DDBS increases the power amplifier's PAE(Power-Added Efficiency) from 40.9 % to 48 %, at an average output power level of 43 dBm. . 이렇게 back-off된 지점에서의 낮아진 효율 을 개선하기 위하여 다양한 방법들이 연구되어 왔다. 대 ⓒ

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Efficiency enhancement for power amplifiers using dynamic bias switching technique

Cited by 12 publications

References 2 publications

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

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

Dual band patch antenna based on complementary rectangular split-ring resonators

Efficiency Improvement of Power Amplifier Using a Digitally-Controlled Dynamic Bias Switching for LTE Base Station

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