A Single-Channel, 600-MS/s, 12-b, Ringamp-Based Pipelined ADC in 28-nm CMOS

Lagos, Jorge; Hershberg, Benjamin; Martens, Ewout; Wambacq, Piet; Craninckx, Jan

doi:10.1109/jssc.2018.2879923

Cited by 45 publications

(13 citation statements)

References 27 publications

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“…Fig. 8(a) shows the top-level open-loop dynamic amplifier design adapted from [23]. It consists of two single-ended RAMP that forms a pseudo-differential configuration and eventually construct a closed loop integrator with additional feedback capacitor and a reset switch.…”

Section: B Signal Combinermentioning

confidence: 99%

Multi-Mode Spatial Signal Processor with Rainbow-like Fast Beam Training and Wideband Communications using True-Time-Delay Arrays

Lin¹,

Puglisi²,

Boljanovic³

et al. 2022

Preprint

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Initial access in millimeter-wave (mmW) wireless is critical toward successful realization of the fifth-generation (5G) wireless networks and beyond. Limited bandwidth in existing standards and use of phase-shifters in analog/hybrid phasedantenna arrays (PAA) are not suited for these emerging standards demanding low-latency direction finding. This work proposes a reconfigurable true-time-delay (TTD) based spatial signal processor (SSP) with frequency-division beam training methodology and wideband beam-squint less data communications. Discrete-time delay compensated clocking technique is used to support 800 MHz bandwidth with a large unity-gain bandwidth ring-amplifier (RAMP)-based signal combiner. To extensively characterize the proposed SSP across different SSP modes and frequency-angle pairs, an automated testbed is developed using computer-vision techniques that significantly speeds up the testing progress and minimize possible human errors. Using seven levels of time-interleaving for each of the 4 antenna elements, the TTD SSP has a delay range of 3.8 ns over 800 MHz and achieves unique frequency-to-angle mapping in the beamtraining mode with nearly 12 dB frequency-independent gain in the beamforming mode. The SSP is prototyped in 65nm CMOS with an area of 1.98mm 2 consuming only 29 mW excluding buffers. Further, an error vector magnitude (EVM) of 9.8% is realized for 16-QAM modulation at a speed of 122.8 Mb/s.

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Section: B Signal Combinermentioning

confidence: 99%

Multi-Mode Spatial Signal Processor with Rainbow-like Fast Beam Training and Wideband Communications using True-Time-Delay Arrays

Lin¹,

Puglisi²,

Boljanovic³

et al. 2022

Preprint

View full text Add to dashboard Cite

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“…where P LNA , P RF , P ADC , P SW and P PA are the low noise amplifier, RF chain, analog-to-digital-converter, phase shifter, switch and power amplifier power consumption, respectively. The baseband power consumption P BB = 10P ref [11], the sampling frequency f s equals to twice the bandwidth, n is the ADC quantization bits, the figure of merit FoM is technology dependent that takes 34.4 fJ/Conv.-step at n = 12 and f s = 600 MS/s [30], the power amplifier efficiency η reaches 40% at 28 GHz [31] and P t is the transmit power from the BS. The AD consumes negligible amount of power.…”

Section: Transceiver Circuitry Power Consumptionmentioning

confidence: 99%

Downlink Multi-User Massive MIMO Transmission Using Receive Spatial Modulation

Raafat

Agustín

Vidal‐Alaball

2020

IEEE Trans. Wireless Commun.

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In this paper, we consider the downlink of multiuser multiple-input-multiple-output system operating in the narrowband and outdoor of millimeter-wave propagation environment. First, we propose a receive spatial modulation (RSM) scheme based on energy efficient transceiver architecture for the single user system. We derive the RSM system assuming single radiofrequency (RF) chain at the user terminal (UT) and then, we propose a novel extension for multiple RF chains. At the UT, we consider analog switches to control which antennas are active during the transmission according to an optimization algorithm aimed at maximizing the spectral efficiency. At the base station (BS), we use analog switches to control the ON/OFF status of the RF chains based on an optimization algorithm to improve the energy efficiency at the BS. Then, we extend the proposed RSM scheme for multiple users. Specifically, we propose an algorithm to jointly optimize number of users, set of antennas and the power allocated for each user to maximize the weighted sum spectral efficiency. After that, for a given number of users and antennas per user, we formulate the power allocation problem as non convex optimization program. Hence, we propose alternating optimization algorithm to convert the non convex program into multiple convex problems. Finally, we compare the performance and the convergence of the proposed alternating optimization with successive convex approximation framework. Simulation results are presented to illustrate the single and multiple users system performance of the RSM scheme compared to conventional modulation transmission.

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“…Therein, P LNA refers to the power consumption of the low noise amplifier (LNA) and it is taken as the reference P ref in the hardware circuitry. Furthermore, the power consumption of the remaining hardware elements such as phase shifter (PS), power amplifier (PA), ADC, digital-to-analog converter (DAC), switch (SW), RF chain and baseband computation (BB) are defined by using the reference power consumption value P ref , f s is the sampling frequency that equals to twice the bandwidth, n refers to number of ADC/DAC bits, FoM is the figure of merit that depends on the technology and takes value of 34.4 fJ/Conv.-step at n = 12 and f s = 600-MS/s [30], η is the power amplifier efficiency that takes value 40% at 28 GHz [31] and P t is the transmit power. The power consumption of the AD is negligible.…”

Section: System and Channel Modelsmentioning

confidence: 99%

Energy Efficient Transmit-Receive Hybrid Spatial Modulation for Large-Scale MIMO Systems

Raafat

Sefunç

Agustín

et al. 2020

IEEE Trans. Commun.

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We consider a point to point large-scale multipleinput multiple-output system operating in the millimeter wave (mmWave) band and an outdoor scenario. Novel transmit and receive spatial modulation schemes are proposed for uplink (UL) and downlink (DL) data transmission phases based on a novel energy efficient hybrid user terminal architecture. The analog circuitry of the proposed hybrid architecture is divided into two stages: phase shifters and analog switches. The phase shifting stage assures high gain and overcomes the severe path-loss caused by outdoor mmWave propagation. The analog switching stage smartly allocates the antennas to be used at the phase shifting stage and combats the spatial correlation. We provide the analysis of the spectral efficiency (SE) of the UL and DL systems. Next, we propose a reduced complexity algorithm that jointly optimizes the analog beamformer and combiner design of the UL and DL circuitry to maximize the energy efficiency (EE). Finally, we compare and evaluate the performance of the proposed algorithm in terms of the SE and EE assuming both stochastic and realistic channel models.

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A Single-Channel, 600-MS/s, 12-b, Ringamp-Based Pipelined ADC in 28-nm CMOS

Cited by 45 publications

References 27 publications

Multi-Mode Spatial Signal Processor with Rainbow-like Fast Beam Training and Wideband Communications using True-Time-Delay Arrays

Multi-Mode Spatial Signal Processor with Rainbow-like Fast Beam Training and Wideband Communications using True-Time-Delay Arrays

Downlink Multi-User Massive MIMO Transmission Using Receive Spatial Modulation

Energy Efficient Transmit-Receive Hybrid Spatial Modulation for Large-Scale MIMO Systems

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