A Calibration-Free/DEM-Free 8-bit 2.4-GS/s Single-Core Digital-to-Analog Converter With a Distributed Biasing Scheme

Juanda,; Shu, Wei; Chang, Joseph S.

doi:10.1109/tvlsi.2018.2850919

Cited by 6 publications

(3 citation statements)

References 23 publications

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“…At the same sampling rate, a pair of 8-bit DAC consumes 34.6 mW of power, nearly same as that of the ADC. Similar trends can be observed in more recent works [27], [28]. Hence, using low resolution DACs can considerably reduce the power consumption by fully digital Tx as shown in Table I.…”

Section: Rffe Is Reported Insupporting

confidence: 86%

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A Case for Digital Beamforming at mmWave

Dutta

Barati

Ramírez

et al. 2020

IEEE Trans. Wireless Commun.

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Due to the heavy reliance of millimeter-wave (mmWave) wireless systems on directional links, beamforming (BF) with high-dimensional arrays is essential for cellular systems in these frequencies.How to perform the array processing in a power efficient manner is a fundamental challenge. Analog and hybrid BF require fewer analog-to-digital and digital-to-analog converters (ADCs and DACs), but can only communicate in a small number of directions at a time, limiting directional search, spatial multiplexing and control signaling. Digital BF enables flexible spatial processing, but must be operated at a low quantization resolution to stay within reasonable power levels. This decrease in quantizer resolution introduces noise in the received signal and degrades the quality of the transmitted signal.To assess the effect of low-resolution quantization on cellular system, we present a simple additive white Gaussian noise (AWGN) model for quantization noise. Simulations with this model reveal that at moderate resolutions (3-4 bits per ADC), there is negligible loss in downlink cellular capacity from quantization. In essence, the low-resolution ADCs limit the high SNR, where cellular systems typically do not operate. For the transmitter, it is shown that DACs with 4 or more bits of resolution do not violate the adjacent carrier leakage limit set by 3 rd Generation Partnership Project (3GPP) New Radio (NR) standards for cellular operations. Further, this work studies the effect of low resolution quantization on the error vector magnitude (EVM) of the transmitted signal.In fact, our findings suggests that low-resolution fully digital BF architectures can be a power efficient alternative to analog or hybrid beamforming for both transmitters and receivers at millimeter wave. 2 Millimeter wave, 5G cellular, Low resolution quantizers, Digital beamforming.

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Section: Rffe Is Reported Insupporting

confidence: 86%

“…Contrary to the assumption made in [24], we observe that both DACs and the ADCs are equally power hungry. For instance the 4-bit Flash based ADC designed in [25] [27], [28]. Hence, using low resolution DACs can considerably reduce the power consumption by fully digital Tx as shown in Table I.…”

Section: Dac and Adcmentioning

confidence: 99%

A Case for Digital Beamforming at mmWave

Dutta

Barati

Ramírez

et al. 2020

IEEE Trans. Wireless Commun.

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“…Although 1-bit ADCs at the receiver do not necessarily entail 1-bit DACs at the transmitter, and in some cases the spectral efficiency could improve somewhat with richer DACs, it is inviting to take the opportunity and adopt 1-bit transmit signals. This not only minimizes the DAC power consumption-somewhat lower than its ADC's counterpart, yet also considerable [11]- [13]-but it enables the power amplifiers to operate in nonlinear regimes where η is higher.…”

Section: Introductionmentioning

confidence: 99%

1-Bit MIMO for Terahertz Channels

Lozano¹

2021

Preprint

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This paper tackles the problem of single-user multiple-input multiple-output communication with 1-bit digital-to-analog and analog-to-digital converters. With the information-theoretic capacity as benchmark, the complementary strategies of beamforming and equiprobable signaling are contrasted in the regimes of operational interest, and the ensuing spectral efficiencies are characterized. Various canonical channel types are considered, with emphasis on line-of-sight settings under both spherical and planar wavefronts, respectively representative of short and long transmission ranges at mmWave and terahertz frequencies. In all cases, a judicious combination of beamforming and equiprobable signaling is shown to operate within a modest gap from capacity.

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