Numerical Analysis of the Supply Voltage of a Switching Mode RF CMOS Power Amplifier to Enhance Its Efficiency

Hwang, Hoyong; Seo, Donghwan; Lee, Changhyun; Park, Changkun

doi:10.1002/mop.27862

Cited by 4 publications

(7 citation statements)

References 15 publications

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“…1. From the results of earlier work [5], [6], it is known that the optimized value of is approximately half that of . With an optimized value of , the efficiency of the PA can be elevated.…”

Section: Typical Switching Mode Rf Cmos Power Amplifiermentioning

confidence: 99%

“…Although most of the power consumption is known to occur in the power stage, reducing power consumption in the driver stage can also be seen as an essential task in the improvement of the efficiency of PAs. Recently, some studies have focused on reducing power consumption in the driver stages in order to improve the overall efficiency [5], [6].…”

Section: Introductionmentioning

confidence: 99%

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Current Shared Cascade Structure for the Driver Stages of Switching Mode RF Power Amplifiers

Hwang

Park

2013

IEEE Microw. Wireless Compon. Lett.

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In this work, we propose a current shared cascade (CSC) structure for the driver stages of switching mode RF power amplifiers (PAs); this CSC is designed using a differential structure. The CSC structure is composed of a first driver stage stacked on top of a second driver stage. The first and second driver stages share a dc current and the effective supply voltages of each driver stage become approximately half the value of the supply voltage of the power stage. The CSC structure enhances the power efficiency because no additional regulator, usually required for the supply voltage of the driver stages, is necessary. We designed the PA to prove the feasibility of the proposed CSC structure. From the measured results, we successfully verify the feasibility of the proposed topology.

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Section: Typical Switching Mode Rf Cmos Power Amplifiermentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Current Shared Cascade Structure for the Driver Stages of Switching Mode RF Power Amplifiers

Hwang

Park

2013

IEEE Microw. Wireless Compon. Lett.

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“…This has now resulted in a better PAE. A detailed discussion of the effects of the absence of the interstage capacitor on PA performance is provided in , for switched mode PAs. The fundamental advantages of such a scheme can be applied equivalently to the current topology biased in class AB as well.…”

Section: Design Of High Gain Resistive Feedback Driver Stagesmentioning

confidence: 99%

A high efficiency inductor-less broadband fully integrated CMOS power amplifier

Bhattacharya

Basu

Rawat

et al. 2014

Int J RF and Microwave Comp Aid Eng

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This work presents the design and implementation of a novel broadband completely inductor-less 300 MHz-2.4 GHz power amplifier (PA) in 180 nm CMOS, primarily for applications in the ultrahigh frequency (UHF) industrial scientific and medical band. This is capable of delivering up to 15.6 dBm saturated output power with an associated peak power added efficiency of 31% in measurement. Although amplifiers with higher output power have been reported, this amplifier occupies only 0.086 mm 2 and does not require any off chip component for its operation, even at the UHF band. It also achieves the highest power density among a similar class of PA's below 10 GHz. V C 2014 Wiley Periodicals, Inc. Int J RF and Microwave CAE 25:311-320, 2015.

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“…Some previous works have shown that if the driver stage is composed of class D, and the dc blocking capacitor between the driver and power stages is removed to elevate the driveability of the driver stage, with V, the optimum value of the supply voltage for the driver stage will be lower than [15], [16]. In this case, if is used for the supply voltage of the driver stage, an unnecessary amount of dc power will be dissipated in the driver stages [15], [16]. The power-added efficiency (PAE) of a typical amplifier with an identical supply voltage, , can be expressed as follows:…”

Section: Typical Structure Of a Cmos Pamentioning

confidence: 99%

A Current-Shared Cascade Structure With an Auxiliary Power Regulator for Switching Mode RF Power Amplifiers

Hwang¹,

Lee²,

Park³

et al. 2014

IEEE Trans. Microwave Theory Techn.

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In this study, we propose an auxiliary power regulator (APR) for the current-shared cascade (CSC) structure of the driver stages of RF CMOS power. Although the CSC structure provides a method to reduce the power consumption at the driver stages of a differential power amplifier (PA), it is difficult to obtain optimum levels of effective supply voltage for the first and second driver stages. Additionally, the transistor sizes of the first and second driver stages of the CSC structure must be identical to ensure the proper operation of the PA. Thus, in this work, we propose an APR structure that ensures the proper operation of a PA with different transistor sizes in its first and second driver stages. To prove the feasibility of the proposed technique, we designed the PA with a CSC structure using an APR. From the measured results, we successfully verify the feasibility of the proposed structure. Additionally, we provide experimental results for a typical CMOS PA to determine the optimum supply voltage for the second driver stage.

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Numerical Analysis of the Supply Voltage of a Switching Mode RF CMOS Power Amplifier to Enhance Its Efficiency

Cited by 4 publications

References 15 publications

Current Shared Cascade Structure for the Driver Stages of Switching Mode RF Power Amplifiers

Current Shared Cascade Structure for the Driver Stages of Switching Mode RF Power Amplifiers

A high efficiency inductor-less broadband fully integrated CMOS power amplifier

A Current-Shared Cascade Structure With an Auxiliary Power Regulator for Switching Mode RF Power Amplifiers

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