A Multimode Multi-Efficiency-Peak Digital Power Amplifier

Yoo, Seongwoo; Hung, Shih-Chang; Yoo, Sang-Min

doi:10.1109/jssc.2020.3022012

Cited by 14 publications

(14 citation statements)

References 33 publications

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“…The DPA operating at the switching mode features high efficiency. The high-efficiency DPAs are usually developed for sub-6 GHz in recent year [17], [18], [19], [20], [21], [22], [23], [24], [25], [26], [27], [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39]. The current-mode DPAs based on Class-E [24], [25] and inverse Class-D [26], [27] are reported with high efficiency.…”

Section: Introductionmentioning

confidence: 99%

“…However, current-mode DPA introduces significant AM-AM and AM-PM distortions, which requires the digital pre-distortion (DPD) for linearity enhancement. The voltage-mode switched capacitor PA (SCPA) is introduced with high linearity by controlling the ratio of switched-on capacitance and total capacitance of all unit cells [28], [29], [30], [31], [32], [33], [34], [35], [36], [37], [38], [39].…”

Section: Introductionmentioning

confidence: 99%

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Millimeter-Wave Quadrature Mixed-Mode Transmitter With Distributed Parasitic Canceling and LO Leakage Self-Suppression

Yang

Qian

Zhou

et al. 2023

IEEE J. Solid-State Circuits

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In this article, a 2 × 9-bit millimeter-wave quadrature mixed-mode transmitter (TX) with distributed parasitic canceling and LO leakage self-suppression is proposed. The mixed-mode architecture uses both digital switched capacitor power amplifier (SCPA) and analog amplifier to achieve high output power and enhanced peak/average efficiency at millimeterwave. In addition, the distributed parasitic canceling with 3-D shielded horizontal capacitor (3-D SHCAP) is adopted to decrease the passive loss for improved efficiency. Besides, the LO leakage self-suppression is introduced, which benefits to linearity and dynamic range. The proposed quadrature mixed-mode TX is implemented and fabricated in the 40-nm CMOS technology. With 1.1/2.2-V supply, it achieves saturated output power of 24.03 dBm with peak system efficiency (SE) of 31.5% at 24 GHz. It also exhibits 23.6% SE for 6-dB PBO at 24 GHz due to Doherty operation. It supports 400-MHz 64QAM signal with an average output power (i.e., P avg ) of 16.37 dBm, an EVM of −29.6 dB, and an ACLR −29.98 dBc. For 200-MHz 256QAM, it exhibits 15.21 dBm P avg with an EVM of −30.9 dB and an ACLR −31.71 dBc at 24 GHz.

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Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

Millimeter-Wave Quadrature Mixed-Mode Transmitter With Distributed Parasitic Canceling and LO Leakage Self-Suppression

Yang

Qian

Zhou

et al. 2023

IEEE J. Solid-State Circuits

View full text Add to dashboard Cite

show abstract

“…To increase the efficiency of PA at PBOs, various techniques are developed, such as envelop tracking (ET) [1], [2], outphasing [3]- [7], Doherty [8]- [13], load modulation [14], [15], and Class-G [16], [17]. To further improve the PA efficiency at deep PBO, the multi-way combined Doherty PA with switched transformer [18], Class-G Doherty [19]- [21], subharmonic switching (SHS) [22]- [24], and hybrid Doherty with impedance boosting [25] are developed. The multi-way combined PA with switched transformer introduces various efficiency peaks due to the load modulation [18], which suffers from relatively large circuit size and limited passive efficiency.…”

mentioning

confidence: 99%

“…The multi-way combined PA with switched transformer introduces various efficiency peaks due to the load modulation [18], which suffers from relatively large circuit size and limited passive efficiency. Class-G Doherty PAs [19]- [21] show competitive efficiency at deep PBOs. However, supply switching is needed, which would lead to linearity degradation due to mode switching [19].…”

mentioning

confidence: 99%

“…However, supply switching is needed, which would lead to linearity degradation due to mode switching [19]. To mitigate the degradation from supply switching, the Class-G voltage-mode Doherty is proposed with extra hardware overhead [20], [21]. The SHS PAs [22]- [24] can enhance the PA efficiency at deep PBO by using subharmonic component of carrier frequency, which sacrifices the circuit size due to multiple power combined ways.…”

mentioning

confidence: 99%

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Quadrature Switched/Floated Capacitor Power Amplifier With Reconfigurable Self-Coupling Canceling Transformer for Deep Back-Off Efficiency Enhancement

Yang

Qian

Luo

2021

IEEE J. Solid-State Circuits

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This article presents a quadrature switched/floated capacitor power amplifier (SFCPA) with deep back-off efficiency enhancement. The SFCPA is introduced to decrease the dynamic power consumption at power back-off (PBO), which could improve the system efficiency (SE). The reconfigurable self-coupling canceling transformer (RSCCT) with enhanced tuning range of turn ratio is used to achieve impedance boosting for further improved efficiency at deep PBO. Based on the proposed SFCPA, a watt-level quadrature digital power amplifier (DPA) with IQ cell sharing, hybrid Doherty, and impedance boosting is proposed for deep PBO efficiency enhancement. Implemented in 40-nm CMOS, the proposed DPA with 1.2-/2.4-V supply achieves 30.3-dBm saturated output power ( P out ) with 36.6%/32.9%/29.1%/23.7%/18.6%/13.2% SE for 0-/3-/6-/9-/12-/15-dB PBOs at 2.4 GHz. For 60-MHz 256-QAM modulation signal, it delivers 23.32-dBm average output power ( P avg ) with an error vector magnitude (EVM) of −31.9 dB and an average drain efficiency (DE) of 30.7%. For 40-MHz 1024-QAM signal, it shows 20.44-dBm P avg with an EVM of −35.9 dB and an average DE of 22.6%.

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High-Efficiency Digital Power Amplifier Design Based on 22-nm CMOS Process

Fang,

Li,

et al. 2023

2023 8th International Conference on Integrated Circuits and Microsystems (ICICM)

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A Multimode Multi-Efficiency-Peak Digital Power Amplifier

Cited by 14 publications

References 33 publications

Millimeter-Wave Quadrature Mixed-Mode Transmitter With Distributed Parasitic Canceling and LO Leakage Self-Suppression

Millimeter-Wave Quadrature Mixed-Mode Transmitter With Distributed Parasitic Canceling and LO Leakage Self-Suppression

Quadrature Switched/Floated Capacitor Power Amplifier With Reconfigurable Self-Coupling Canceling Transformer for Deep Back-Off Efficiency Enhancement

High-Efficiency Digital Power Amplifier Design Based on 22-nm CMOS Process

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