6.2 A 4-Way Doherty Digital Transmitter Featuring 50%-LO Signed IQ Interleave Upconversion with more than 27dBm Peak Power and 40% Drain Efficiency at 10dB Power Back-Off Operating in the 5GHz Band

Beikmirza, Mohammadreza; Shen, Yiyu; Mehrpoo, Mohammadreza; Hashemi, Mohsen; Mul, Dieuwert; Vreede, L.C.N. de; Alavi, Morteza S.

doi:10.1109/isscc42613.2021.9365831

Cited by 14 publications

(12 citation statements)

References 8 publications

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“…The proposed IQ-mapping technique is different from previous digital PA (DPA) IQ-sharing techniques reported in the literature [21], [26]- [31]. Namely, in [21], 25% duty-cycle clocks are deployed to avoid overlap among the quadrature clocks.…”

Section: Comparison With Iq-sharing Techniquesmentioning

confidence: 99%

A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters

Shen

Bootsman

Alavi

et al. 2022

IEEE J. Solid-State Circuits

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This article presents a wideband 2 × 12-bit direct-digital RF modulator (DDRM) operating in a 0.5-to-3-GHz band for 5G transmitters. The proposed digital Cartesian modulator features an advanced IQ-mapping technique to boost RF power by 3 dB and suppress the I/ Q image. To verify the proposed concept, a 40-nm CMOS prototype is implemented whose RF peak output power at 2 GHz is more than 14 dBm. It achieves an adjacent-channel leakage ratio (ACLR) of −52 dBc and an error vector magnitude (EVM) of −40 dB for a 20-MHz 256-QAM signal at 2.4 GHz. With a 320-MHz 256-QAM signal, the measured ACLR and EVM performances are better than −43 dBc and −32 dB at 2.4 GHz, respectively, without using any digital pre-distortion.

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Section: Comparison With Iq-sharing Techniquesmentioning

confidence: 99%

A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters

Shen

Bootsman

Alavi

et al. 2022

IEEE J. Solid-State Circuits

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“…Digital design is more flexible and integrated, so the research of wireless communication gradually transits to digital domain [1]. Possible digital transmitter architectures such as I/Q architecture [2,3], the polar architecture [4,5], and the outphasing architecture [6] were proposed and studied.…”

Section: Introductionmentioning

confidence: 99%

K-Band Digital Power Amplifier Based on InP DHBT

Guo

Zhou

et al. 2022

J. Phys.: Conf. Ser.

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Based on 0.7-μm indium phosphide (InP) double heterojunction bipolar transistor (DHBT) process, this paper designs a digital power amplifier (DPA) monolithic microwave integrated circuit. Digital-to-analog converter (DAC), modulation and power amplifier are integrated into the DPA, reducing losses and improving linearity of traditional radio frequency (RF) links. The test results show that the DPA can achieve an output power of 23-23.5 dBm and power added efficiency (PAE) of 21.5-23% within 19.2-21.2 GHz. And the mean squared error of normalized output voltage is 0.0158 at 20 GHz. Then, asymmetrical synthesis technology is used to improve the efficiency of DPA in non-full amplitude state. Simulation results of DPA demonstrate saturated output power of 23.5 dBm and the maximum PAE of 21.9% in 19-21 GHz. At 20 GHz, the PAE between full and half amplitude state is greater than 20%.

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“…To address these demands, digital TXs (DTXs) have emerged as favorable alternative architectures as they supplant the functionality of the conventional analog-intensive TXs circuit blocks, such as the baseband digital-to-analog converters (DACs), low-pass filter, mixer, and power amplifier (PA) with a single radio frequency DAC (RF-DAC) block [2], [3], [4], [5], [6], [7], [8], [9], [10], [11], [12], [13], [14], [15]. These DTXs consist of many unit cells comprising digital interpolation filters, bit-wise implicit mixers, and their digital PAs (DPAs).…”

mentioning

confidence: 99%

A Wideband Energy-Efficient Multi-Mode CMOS Digital Transmitter

Beikmirza

Shen

Vreede

et al. 2023

IEEE J. Solid-State Circuits

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This article presents a wideband, energy-efficient digital transmitter (DTX) suitable for multi-mode/multi-band wireless communication applications. It features various operation modes comprising Cartesian (Modes-1/-2) and multi-phase (Modes-3/-4) configurations utilizing LO clocks with different duty cycle in the interleaving/non-interleaving configurations. The multi-phase operation compromises polar and Cartesian features by mapping the I/ Q signals into two non-orthogonal basis vectors with a 45 • relative phase difference and a 3-bit phase selector scheme. The different operation modes are extensively analyzed and compared. Fabricated in a 40-nm CMOS process with an off-chip matching network, the proposed DTX occupies a core area of 0.72 mm 2 and delivers 23.18-dBm RF peak power at 2.1 GHz from a 0.95-V supply voltage with drain/system efficiencies of 66.26%/52.59%, respectively. Utilizing a simple memory-less digital pre-distortion (DPD) for a 160-MHz four-channel 64-quadrature amplitude modulation (QAM) orthogonal frequency-division multiplexing (OFDM) signal, the DTX delivers an average P Out of 13.5/11.4/7.7/9.4 dBm, achieving an adjacent channel leakage (power) ratio (ACL(P)R) of better than −42/−40/−40/−38 dBc and an average error vector magnitude (EVM) of −36/−34/−34/−32 dB, operating in Modes-1/-2/-3/-4, respectively. While transmitting a 200-MHz single-channel 256 (1024)-QAM OFDM signal at 2.4 GHz in Modes-1/-4, the average delivered output power is 14.11/9.29 (12.23/7.32) dBm with average drain and system efficiencies of 33.17%/26.3% (23.82%/22.83%) and 24.81%/22.85% (19.34%/18.81%), while the ACLR and EVM are better than −42/−41 (−43/−43) dBc and −34.6/−33.1 (−33.5/−33.9) dB, respectively.

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6.2 A 4-Way Doherty Digital Transmitter Featuring 50%-LO Signed IQ Interleave Upconversion with more than 27dBm Peak Power and 40% Drain Efficiency at 10dB Power Back-Off Operating in the 5GHz Band

Cited by 14 publications

References 8 publications

A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters

A Wideband IQ-Mapping Direct-Digital RF Modulator for 5G Transmitters

K-Band Digital Power Amplifier Based on InP DHBT

A Wideband Energy-Efficient Multi-Mode CMOS Digital Transmitter

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